drm/mgag200: Fix big-endian support

12 messages, 2 authors, 21d ago · open the first message on its own page

drm/mgag200: Fix big-endian support

From: Christian Zigotzky <hidden>
Date: 2026-08-02 18:06:54 

Hello René,

Many thanks for your patch. [1]

I have bought the PCI graphics card Matrox G200 G2+/QUADP-PL/7 32MB with 4x DVI. It is an AGP card connected via PCI. 

We use the new DRM driver MGAG200 since the kernel 7.2.0-rc4 and the old DRM legacy driver for Matrox g200/g400 graphics cards since the stable long-term kernel 5.10.260.

I tested it with the RC5 of kernel 7.2 in my PowerPC machine (e5500) today. Unfortunately, the DRM driver mgag200 can't read the PCI ROM. Maybe only an x86 ROM?

xrandr detects the ports but reports that they are not connected, even though the cables are plugged in.

I also tested it with the stable long-term kernel 5.10.261 with the old legacy DRM drivers for Matrox graphics cards.
I installed the Xorg MGA server xf86-video-mga-2.0.0_3 for the old legacy DRM driver but unfortunately I get only a black screen.

Is it possible to use this card with PPC Linux?

More information:

lspci -vvv

0001:05:00.0 VGA compatible controller: Matrox Electronics Systems Ltd. MGA G200 AGP (rev 03) (prog-if 00 [VGA controller])
	Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 18
	Region 0: Memory at c20000000 (32-bit, prefetchable) [size=16M]
	Region 1: Memory at c21000000 (32-bit, non-prefetchable) [size=16K]
	Region 2: Memory at c21800000 (32-bit, non-prefetchable) [size=8M]
	Expansion ROM at c21010000 [disabled] [size=64K]
	Capabilities: [dc] Power Management version 1
		Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [f0] AGP version 1.0
		Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2
		Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- Rate=<none>
	Kernel driver in use: mgag200

0001:05:04.0 Display controller: Matrox Electronics Systems Ltd. MGA G200 AGP (rev 03)
	Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 18
	Region 0: Memory at c22000000 (32-bit, prefetchable) [size=16M]
	Region 1: Memory at c23000000 (32-bit, non-prefetchable) [size=16K]
	Region 2: Memory at c23800000 (32-bit, non-prefetchable) [size=8M]
	Expansion ROM at c21020000 [disabled] [size=64K]
	Capabilities: [dc] Power Management version 1
		Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [f0] AGP version 1.0
		Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2
		Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- Rate=<none>
	Kernel driver in use: mgag200

0001:05:08.0 Display controller: Matrox Electronics Systems Ltd. MGA G200 AGP (rev 03)
	Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 18
	Region 0: Memory at c24000000 (32-bit, prefetchable) [size=16M]
	Region 1: Memory at c25000000 (32-bit, non-prefetchable) [size=16K]
	Region 2: Memory at c25800000 (32-bit, non-prefetchable) [size=8M]
	Expansion ROM at c21030000 [disabled] [size=64K]
	Capabilities: [dc] Power Management version 1
		Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [f0] AGP version 1.0
		Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2
		Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- Rate=<none>
	Kernel driver in use: mgag200

0001:05:0c.0 Display controller: Matrox Electronics Systems Ltd. MGA G200 AGP (rev 03)
	Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 18
	Region 0: Memory at c26000000 (32-bit, prefetchable) [size=16M]
	Region 1: Memory at c27000000 (32-bit, non-prefetchable) [size=16K]
	Region 2: Memory at c27800000 (32-bit, non-prefetchable) [size=8M]
	Expansion ROM at c21040000 [disabled] [size=64K]
	Capabilities: [dc] Power Management version 1
		Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [f0] AGP version 1.0
		Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2
		Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- Rate=<none>
	Kernel driver in use: mgag200


dmesg | grep -i mga

[    2.302206] [drm] Initialized mgag200 1.0.0 for 0001:05:00.0 on minor 1
[    2.303761] mgag200 0001:05:00.0: [drm] Cannot find any crtc or sizes
[    2.304697] mgag200 0001:05:04.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0xffff
[    2.305792] [drm] Initialized mgag200 1.0.0 for 0001:05:04.0 on minor 2
[    2.308281] mgag200 0001:05:04.0: [drm] Cannot find any crtc or sizes
[    2.308802] mgag200 0001:05:08.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0xffff
[    2.309319] [drm] Initialized mgag200 1.0.0 for 0001:05:08.0 on minor 3
[    2.309785] mgag200 0001:05:00.0: [drm] Cannot find any crtc or sizes
[    2.310900] mgag200 0001:05:08.0: [drm] Cannot find any crtc or sizes
[    2.311895] mgag200 0001:05:0c.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0xffff
[    2.312633] [drm] Initialized mgag200 1.0.0 for 0001:05:0c.0 on minor 4
[    2.312844] mgag200 0001:05:04.0: [drm] Cannot find any crtc or sizes
[    2.315512] mgag200 0001:05:0c.0: [drm] Cannot find any crtc or sizes
[    2.317178] mgag200 0001:05:08.0: [drm] Cannot find any crtc or sizes
[    2.323318] mgag200 0001:05:0c.0: [drm] Cannot find any crtc or sizes

xrandr

…

VGA-4-4 disconnected (normal left inverted right x axis y axis)
VGA-3-3 disconnected (normal left inverted right x axis y axis)
VGA-2-2 disconnected (normal left inverted right x axis y axis)
VGA-1-1 disconnected (normal left inverted right x axis y axis)

…

lspci -nnk | grep VGA

0001:05:00.0 VGA compatible controller [0300]: Matrox Electronics Systems Ltd. MGA G200 AGP [102b:0521] (rev 03)

Thanks,
Christian

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/gpu/drm/mgag200/mgag200_mode.c?id=6cb31fba137d45e682ce455b8ea364f44d5d4f98

Re: drm/mgag200: Fix big-endian support

From: Christian Zigotzky <hidden>
Date: 2026-08-26 07:18:26 

Hi All,

Any hints because of this issue?

Further information: https://forum.hyperion-entertainment.com/viewtopic.php?t=5201

Thanks,
Christian


On 02 August 2026 at 08:07 pm, Christian Zigotzky [off-list ref] wrote:

Hello René,

Many thanks for your patch. [1]

I have bought the PCI graphics card Matrox G200 G2+/QUADP-PL/7 32MB with 4x DVI. It is an AGP card connected via PCI.

We use the new DRM driver MGAG200 since the kernel 7.2.0-rc4 and the old DRM legacy driver for Matrox g200/g400 graphics cards since the stable long-term kernel 5.10.260.

I tested it with the RC5 of kernel 7.2 in my PowerPC machine (e5500) today. Unfortunately, the DRM driver mgag200 can't read the PCI ROM. Maybe only an x86 ROM?

xrandr detects the ports but reports that they are not connected, even though the cables are plugged in.

I also tested it with the stable long-term kernel 5.10.261 with the old legacy DRM drivers for Matrox graphics cards.
I installed the Xorg MGA server xf86-video-mga-2.0.0_3 for the old legacy DRM driver but unfortunately I get only a black screen.

Is it possible to use this card with PPC Linux?

More information:

lspci -vvv

0001:05:00.0 VGA compatible controller: Matrox Electronics Systems Ltd. MGA G200 AGP (rev 03) (prog-if 00 [VGA controller])
   Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor
   Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
   Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
   Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes
   Interrupt: pin A routed to IRQ 18
   Region 0: Memory at c20000000 (32-bit, prefetchable) [size=16M]
   Region 1: Memory at c21000000 (32-bit, non-prefetchable) [size=16K]
   Region 2: Memory at c21800000 (32-bit, non-prefetchable) [size=8M]
   Expansion ROM at c21010000 [disabled] [size=64K]
   Capabilities: [dc] Power Management version 1
       Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
       Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
   Capabilities: [f0] AGP version 1.0
       Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2
       Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- Rate=<none>
   Kernel driver in use: mgag200

0001:05:04.0 Display controller: Matrox Electronics Systems Ltd. MGA G200 AGP (rev 03)
   Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor
   Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
   Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
   Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes
   Interrupt: pin A routed to IRQ 18
   Region 0: Memory at c22000000 (32-bit, prefetchable) [size=16M]
   Region 1: Memory at c23000000 (32-bit, non-prefetchable) [size=16K]
   Region 2: Memory at c23800000 (32-bit, non-prefetchable) [size=8M]
   Expansion ROM at c21020000 [disabled] [size=64K]
   Capabilities: [dc] Power Management version 1
       Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
       Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
   Capabilities: [f0] AGP version 1.0
       Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2
       Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- Rate=<none>
   Kernel driver in use: mgag200

0001:05:08.0 Display controller: Matrox Electronics Systems Ltd. MGA G200 AGP (rev 03)
   Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor
   Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
   Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
   Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes
   Interrupt: pin A routed to IRQ 18
   Region 0: Memory at c24000000 (32-bit, prefetchable) [size=16M]
   Region 1: Memory at c25000000 (32-bit, non-prefetchable) [size=16K]
   Region 2: Memory at c25800000 (32-bit, non-prefetchable) [size=8M]
   Expansion ROM at c21030000 [disabled] [size=64K]
   Capabilities: [dc] Power Management version 1
       Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
       Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
   Capabilities: [f0] AGP version 1.0
       Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2
       Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- Rate=<none>
   Kernel driver in use: mgag200

0001:05:0c.0 Display controller: Matrox Electronics Systems Ltd. MGA G200 AGP (rev 03)
   Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor
   Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
   Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
   Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes
   Interrupt: pin A routed to IRQ 18
   Region 0: Memory at c26000000 (32-bit, prefetchable) [size=16M]
   Region 1: Memory at c27000000 (32-bit, non-prefetchable) [size=16K]
   Region 2: Memory at c27800000 (32-bit, non-prefetchable) [size=8M]
   Expansion ROM at c21040000 [disabled] [size=64K]
   Capabilities: [dc] Power Management version 1
       Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
       Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
   Capabilities: [f0] AGP version 1.0
       Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2
       Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- Rate=<none>
   Kernel driver in use: mgag200


dmesg | grep -i mga

[    2.302206] [drm] Initialized mgag200 1.0.0 for 0001:05:00.0 on minor 1
[    2.303761] mgag200 0001:05:00.0: [drm] Cannot find any crtc or sizes
[    2.304697] mgag200 0001:05:04.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0xffff
[    2.305792] [drm] Initialized mgag200 1.0.0 for 0001:05:04.0 on minor 2
[    2.308281] mgag200 0001:05:04.0: [drm] Cannot find any crtc or sizes
[    2.308802] mgag200 0001:05:08.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0xffff
[    2.309319] [drm] Initialized mgag200 1.0.0 for 0001:05:08.0 on minor 3
[    2.309785] mgag200 0001:05:00.0: [drm] Cannot find any crtc or sizes
[    2.310900] mgag200 0001:05:08.0: [drm] Cannot find any crtc or sizes
[    2.311895] mgag200 0001:05:0c.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0xffff
[    2.312633] [drm] Initialized mgag200 1.0.0 for 0001:05:0c.0 on minor 4
[    2.312844] mgag200 0001:05:04.0: [drm] Cannot find any crtc or sizes
[    2.315512] mgag200 0001:05:0c.0: [drm] Cannot find any crtc or sizes
[    2.317178] mgag200 0001:05:08.0: [drm] Cannot find any crtc or sizes
[    2.323318] mgag200 0001:05:0c.0: [drm] Cannot find any crtc or sizes

xrandr

…

VGA-4-4 disconnected (normal left inverted right x axis y axis)
VGA-3-3 disconnected (normal left inverted right x axis y axis)
VGA-2-2 disconnected (normal left inverted right x axis y axis)
VGA-1-1 disconnected (normal left inverted right x axis y axis)

…

lspci -nnk | grep VGA

0001:05:00.0 VGA compatible controller [0300]: Matrox Electronics Systems Ltd. MGA G200 AGP [102b:0521] (rev 03)

Thanks,
Christian

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/gpu/drm/mgag200/mgag200_mode.c?id=6cb31fba137d45e682ce455b8ea364f44d5d4f98

Re: drm/mgag200: Fix big-endian support

From: Thomas Zimmermann <tzimmermann@suse.de>
Date: 2026-08-26 07:49:11 

Hi

Am 02.08.26 um 20:06 schrieb Christian Zigotzky:
Hello René,

Many thanks for your patch. [1]

I have bought the PCI graphics card Matrox G200 G2+/QUADP-PL/7 32MB with 4x DVI. It is an AGP card connected via PCI.

We use the new DRM driver MGAG200 since the kernel 7.2.0-rc4 and the old DRM legacy driver for Matrox g200/g400 graphics cards since the stable long-term kernel 5.10.260.

I tested it with the RC5 of kernel 7.2 in my PowerPC machine (e5500) today. Unfortunately, the DRM driver mgag200 can't read the PCI ROM. Maybe only an x86 ROM?
This comment in the rsp fbdev driver might explain what's happening here:

https://elixir.bootlin.com/linux/v7.2/source/drivers/video/fbdev/matrox/matroxfb_misc.c#L501

xrandr detects the ports but reports that they are not connected, even though the cables are plugged in.

I also tested it with the stable long-term kernel 5.10.261 with the old legacy DRM drivers for Matrox graphics cards.
I installed the Xorg MGA server xf86-video-mga-2.0.0_3 for the old legacy DRM driver but unfortunately I get only a black screen.

Is it possible to use this card with PPC Linux?
Doing ROM-parsing as the same as old driver does could possibly resolve 
the issue.  If nothing else shows up, I'll take a look at it.

Best regards
Thomas


More information:

lspci -vvv

0001:05:00.0 VGA compatible controller: Matrox Electronics Systems Ltd. MGA G200 AGP (rev 03) (prog-if 00 [VGA controller])
	Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 18
	Region 0: Memory at c20000000 (32-bit, prefetchable) [size=16M]
	Region 1: Memory at c21000000 (32-bit, non-prefetchable) [size=16K]
	Region 2: Memory at c21800000 (32-bit, non-prefetchable) [size=8M]
	Expansion ROM at c21010000 [disabled] [size=64K]
	Capabilities: [dc] Power Management version 1
		Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [f0] AGP version 1.0
		Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2
		Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- Rate=<none>
	Kernel driver in use: mgag200

0001:05:04.0 Display controller: Matrox Electronics Systems Ltd. MGA G200 AGP (rev 03)
	Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 18
	Region 0: Memory at c22000000 (32-bit, prefetchable) [size=16M]
	Region 1: Memory at c23000000 (32-bit, non-prefetchable) [size=16K]
	Region 2: Memory at c23800000 (32-bit, non-prefetchable) [size=8M]
	Expansion ROM at c21020000 [disabled] [size=64K]
	Capabilities: [dc] Power Management version 1
		Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [f0] AGP version 1.0
		Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2
		Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- Rate=<none>
	Kernel driver in use: mgag200

0001:05:08.0 Display controller: Matrox Electronics Systems Ltd. MGA G200 AGP (rev 03)
	Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 18
	Region 0: Memory at c24000000 (32-bit, prefetchable) [size=16M]
	Region 1: Memory at c25000000 (32-bit, non-prefetchable) [size=16K]
	Region 2: Memory at c25800000 (32-bit, non-prefetchable) [size=8M]
	Expansion ROM at c21030000 [disabled] [size=64K]
	Capabilities: [dc] Power Management version 1
		Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [f0] AGP version 1.0
		Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2
		Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- Rate=<none>
	Kernel driver in use: mgag200

0001:05:0c.0 Display controller: Matrox Electronics Systems Ltd. MGA G200 AGP (rev 03)
	Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 18
	Region 0: Memory at c26000000 (32-bit, prefetchable) [size=16M]
	Region 1: Memory at c27000000 (32-bit, non-prefetchable) [size=16K]
	Region 2: Memory at c27800000 (32-bit, non-prefetchable) [size=8M]
	Expansion ROM at c21040000 [disabled] [size=64K]
	Capabilities: [dc] Power Management version 1
		Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [f0] AGP version 1.0
		Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2
		Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- Rate=<none>
	Kernel driver in use: mgag200


dmesg | grep -i mga

[    2.302206] [drm] Initialized mgag200 1.0.0 for 0001:05:00.0 on minor 1
[    2.303761] mgag200 0001:05:00.0: [drm] Cannot find any crtc or sizes
[    2.304697] mgag200 0001:05:04.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0xffff
[    2.305792] [drm] Initialized mgag200 1.0.0 for 0001:05:04.0 on minor 2
[    2.308281] mgag200 0001:05:04.0: [drm] Cannot find any crtc or sizes
[    2.308802] mgag200 0001:05:08.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0xffff
[    2.309319] [drm] Initialized mgag200 1.0.0 for 0001:05:08.0 on minor 3
[    2.309785] mgag200 0001:05:00.0: [drm] Cannot find any crtc or sizes
[    2.310900] mgag200 0001:05:08.0: [drm] Cannot find any crtc or sizes
[    2.311895] mgag200 0001:05:0c.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0xffff
[    2.312633] [drm] Initialized mgag200 1.0.0 for 0001:05:0c.0 on minor 4
[    2.312844] mgag200 0001:05:04.0: [drm] Cannot find any crtc or sizes
[    2.315512] mgag200 0001:05:0c.0: [drm] Cannot find any crtc or sizes
[    2.317178] mgag200 0001:05:08.0: [drm] Cannot find any crtc or sizes
[    2.323318] mgag200 0001:05:0c.0: [drm] Cannot find any crtc or sizes

xrandr

…

VGA-4-4 disconnected (normal left inverted right x axis y axis)
VGA-3-3 disconnected (normal left inverted right x axis y axis)
VGA-2-2 disconnected (normal left inverted right x axis y axis)
VGA-1-1 disconnected (normal left inverted right x axis y axis)

…

lspci -nnk | grep VGA

0001:05:00.0 VGA compatible controller [0300]: Matrox Electronics Systems Ltd. MGA G200 AGP [102b:0521] (rev 03)

Thanks,
Christian

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/gpu/drm/mgag200/mgag200_mode.c?id=6cb31fba137d45e682ce455b8ea364f44d5d4f98
-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com
GF: Jochen Jaser, Andrew McDonald, (HRB 36809, AG Nürnberg)

Re: drm/mgag200: Fix big-endian support

From: Thomas Zimmermann <tzimmermann@suse.de>
Date: 2026-08-26 09:07:09 

Hi

Am 02.08.26 um 20:06 schrieb Christian Zigotzky:
Hello René,

Many thanks for your patch. [1]

I have bought the PCI graphics card Matrox G200 G2+/QUADP-PL/7 32MB with 4x DVI. It is an AGP card connected via PCI.

We use the new DRM driver MGAG200 since the kernel 7.2.0-rc4 and the old DRM legacy driver for Matrox g200/g400 graphics cards since the stable long-term kernel 5.10.260.

I tested it with the RC5 of kernel 7.2 in my PowerPC machine (e5500) today. Unfortunately, the DRM driver mgag200 can't read the PCI ROM. Maybe only an x86 ROM?

xrandr detects the ports but reports that they are not connected, even though the cables are plugged in.

I also tested it with the stable long-term kernel 5.10.261 with the old legacy DRM drivers for Matrox graphics cards.
I installed the Xorg MGA server xf86-video-mga-2.0.0_3 for the old legacy DRM driver but unfortunately I get only a black screen.

Is it possible to use this card with PPC Linux?
Attached is the patch I promised.  Please apply it and test it on your 
machine. Does it make the card work?

Best regards
Thomas

More information:

lspci -vvv

0001:05:00.0 VGA compatible controller: Matrox Electronics Systems Ltd. MGA G200 AGP (rev 03) (prog-if 00 [VGA controller])
	Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 18
	Region 0: Memory at c20000000 (32-bit, prefetchable) [size=16M]
	Region 1: Memory at c21000000 (32-bit, non-prefetchable) [size=16K]
	Region 2: Memory at c21800000 (32-bit, non-prefetchable) [size=8M]
	Expansion ROM at c21010000 [disabled] [size=64K]
	Capabilities: [dc] Power Management version 1
		Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [f0] AGP version 1.0
		Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2
		Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- Rate=<none>
	Kernel driver in use: mgag200

0001:05:04.0 Display controller: Matrox Electronics Systems Ltd. MGA G200 AGP (rev 03)
	Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 18
	Region 0: Memory at c22000000 (32-bit, prefetchable) [size=16M]
	Region 1: Memory at c23000000 (32-bit, non-prefetchable) [size=16K]
	Region 2: Memory at c23800000 (32-bit, non-prefetchable) [size=8M]
	Expansion ROM at c21020000 [disabled] [size=64K]
	Capabilities: [dc] Power Management version 1
		Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [f0] AGP version 1.0
		Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2
		Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- Rate=<none>
	Kernel driver in use: mgag200

0001:05:08.0 Display controller: Matrox Electronics Systems Ltd. MGA G200 AGP (rev 03)
	Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 18
	Region 0: Memory at c24000000 (32-bit, prefetchable) [size=16M]
	Region 1: Memory at c25000000 (32-bit, non-prefetchable) [size=16K]
	Region 2: Memory at c25800000 (32-bit, non-prefetchable) [size=8M]
	Expansion ROM at c21030000 [disabled] [size=64K]
	Capabilities: [dc] Power Management version 1
		Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [f0] AGP version 1.0
		Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2
		Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- Rate=<none>
	Kernel driver in use: mgag200

0001:05:0c.0 Display controller: Matrox Electronics Systems Ltd. MGA G200 AGP (rev 03)
	Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 18
	Region 0: Memory at c26000000 (32-bit, prefetchable) [size=16M]
	Region 1: Memory at c27000000 (32-bit, non-prefetchable) [size=16K]
	Region 2: Memory at c27800000 (32-bit, non-prefetchable) [size=8M]
	Expansion ROM at c21040000 [disabled] [size=64K]
	Capabilities: [dc] Power Management version 1
		Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [f0] AGP version 1.0
		Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2
		Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- Rate=<none>
	Kernel driver in use: mgag200


dmesg | grep -i mga

[    2.302206] [drm] Initialized mgag200 1.0.0 for 0001:05:00.0 on minor 1
[    2.303761] mgag200 0001:05:00.0: [drm] Cannot find any crtc or sizes
[    2.304697] mgag200 0001:05:04.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0xffff
[    2.305792] [drm] Initialized mgag200 1.0.0 for 0001:05:04.0 on minor 2
[    2.308281] mgag200 0001:05:04.0: [drm] Cannot find any crtc or sizes
[    2.308802] mgag200 0001:05:08.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0xffff
[    2.309319] [drm] Initialized mgag200 1.0.0 for 0001:05:08.0 on minor 3
[    2.309785] mgag200 0001:05:00.0: [drm] Cannot find any crtc or sizes
[    2.310900] mgag200 0001:05:08.0: [drm] Cannot find any crtc or sizes
[    2.311895] mgag200 0001:05:0c.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0xffff
[    2.312633] [drm] Initialized mgag200 1.0.0 for 0001:05:0c.0 on minor 4
[    2.312844] mgag200 0001:05:04.0: [drm] Cannot find any crtc or sizes
[    2.315512] mgag200 0001:05:0c.0: [drm] Cannot find any crtc or sizes
[    2.317178] mgag200 0001:05:08.0: [drm] Cannot find any crtc or sizes
[    2.323318] mgag200 0001:05:0c.0: [drm] Cannot find any crtc or sizes

xrandr

…

VGA-4-4 disconnected (normal left inverted right x axis y axis)
VGA-3-3 disconnected (normal left inverted right x axis y axis)
VGA-2-2 disconnected (normal left inverted right x axis y axis)
VGA-1-1 disconnected (normal left inverted right x axis y axis)

…

lspci -nnk | grep VGA

0001:05:00.0 VGA compatible controller [0300]: Matrox Electronics Systems Ltd. MGA G200 AGP [102b:0521] (rev 03)

Thanks,
Christian

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/gpu/drm/mgag200/mgag200_mode.c?id=6cb31fba137d45e682ce455b8ea364f44d5d4f98
-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com
GF: Jochen Jaser, Andrew McDonald, (HRB 36809, AG Nürnberg)

Re: drm/mgag200: Fix big-endian support

From: Christian Zigotzky <hidden>
Date: 2026-08-26 15:07:37 

On 26/08/26 11:06, Thomas Zimmermann wrote:
 > Hi
 >
 > Am 02.08.26 um 20:06 schrieb Christian Zigotzky:
 >> Hello René,
 >>
 >> Many thanks for your patch. [1]
 >>
 >> I have bought the PCI graphics card Matrox G200 G2+/QUADP-PL/7 32MB 
with 4x DVI. It is an AGP card connected via PCI.
 >>
 >> We use the new DRM driver MGAG200 since the kernel 7.2.0-rc4 and the 
old DRM legacy driver for Matrox g200/g400 graphics cards since the 
stable long-term kernel 5.10.260.
 >>
 >> I tested it with the RC5 of kernel 7.2 in my PowerPC machine (e5500) 
today. Unfortunately, the DRM driver mgag200 can't read the PCI ROM. 
Maybe only an x86 ROM?
 >>
 >> xrandr detects the ports but reports that they are not connected, 
even though the cables are plugged in.
 >>
 >> I also tested it with the stable long-term kernel 5.10.261 with the 
old legacy DRM drivers for Matrox graphics cards.
 >> I installed the Xorg MGA server xf86-video-mga-2.0.0_3 for the old 
legacy DRM driver but unfortunately I get only a black screen.
 >>
 >> Is it possible to use this card with PPC Linux?
 >
 > Attached is the patch I promised.  Please apply it and test it on 
your machine. Does it make the card work?
 >
 > Best regards
 > Thomas

Hello Thomas,

Thank you for your patch. Unfortunately the card doesn't work with the 
patched kernel.

dmesg | grep -i mga

[    2.307195] [drm] Initialized mgag200 1.0.0 for 0001:05:00.0 on minor 1
[    2.308649] mgag200 0001:05:00.0: [drm] Cannot find any crtc or sizes
[    2.309551] mgag200 0001:05:04.0: Invalid PCI ROM header signature: 
expecting 0xaa55, got 0xffff
[    2.310305] [drm] Initialized mgag200 1.0.0 for 0001:05:04.0 on minor 2
[    2.312660] mgag200 0001:05:04.0: [drm] Cannot find any crtc or sizes
[    2.313177] mgag200 0001:05:00.0: [drm] Cannot find any crtc or sizes
[    2.313640] mgag200 0001:05:08.0: Invalid PCI ROM header signature: 
expecting 0xaa55, got 0xffff
[    2.314357] [drm] Initialized mgag200 1.0.0 for 0001:05:08.0 on minor 3
[    2.317630] mgag200 0001:05:08.0: [drm] Cannot find any crtc or sizes
[    2.318185] mgag200 0001:05:0c.0: Invalid PCI ROM header signature: 
expecting 0xaa55, got 0xffff
[    2.318840] mgag200 0001:05:04.0: [drm] Cannot find any crtc or sizes
[    2.319345] [drm] Initialized mgag200 1.0.0 for 0001:05:0c.0 on minor 4
[    2.321014] mgag200 0001:05:0c.0: [drm] Cannot find any crtc or sizes
[    2.322400] mgag200 0001:05:08.0: [drm] Cannot find any crtc or sizes
[    2.327215] mgag200 0001:05:0c.0: [drm] Cannot find any crtc or sizes

lspci -vvv

0001:05:00.0 VGA compatible controller: Matrox Electronics Systems Ltd. 
MGA G200 AGP (rev 03) (prog-if 00 [VGA controller])
     Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor
     Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx-
     Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- 
<TAbort- <MAbort- >SERR- <PERR- INTx-
     Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes
     Interrupt: pin A routed to IRQ 18
     Region 0: Memory at c20000000 (32-bit, prefetchable) [size=16M]
     Region 1: Memory at c21000000 (32-bit, non-prefetchable) [size=16K]
     Region 2: Memory at c21800000 (32-bit, non-prefetchable) [size=8M]
     Expansion ROM at c21010000 [disabled] [size=64K]
     Capabilities: [dc] Power Management version 1
         Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA 
PME(D0-,D1-,D2-,D3hot-,D3cold-)
         Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
     Capabilities: [f0] AGP version 1.0
         Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 
64bit- FW- AGP3- Rate=x1,x2
         Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- 
Rate=<none>
     Kernel driver in use: mgag200

0001:05:04.0 Display controller: Matrox Electronics Systems Ltd. MGA 
G200 AGP (rev 03)
     Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor
     Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx-
     Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- 
<TAbort- <MAbort- >SERR- <PERR- INTx-
     Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes
     Interrupt: pin A routed to IRQ 18
     Region 0: Memory at c22000000 (32-bit, prefetchable) [size=16M]
     Region 1: Memory at c23000000 (32-bit, non-prefetchable) [size=16K]
     Region 2: Memory at c23800000 (32-bit, non-prefetchable) [size=8M]
     Expansion ROM at c21020000 [disabled] [size=64K]
     Capabilities: [dc] Power Management version 1
         Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA 
PME(D0-,D1-,D2-,D3hot-,D3cold-)
         Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
     Capabilities: [f0] AGP version 1.0
         Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 
64bit- FW- AGP3- Rate=x1,x2
         Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- 
Rate=<none>
     Kernel driver in use: mgag200

0001:05:08.0 Display controller: Matrox Electronics Systems Ltd. MGA 
G200 AGP (rev 03)
     Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor
     Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx-
     Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- 
<TAbort- <MAbort- >SERR- <PERR- INTx-
     Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes
     Interrupt: pin A routed to IRQ 18
     Region 0: Memory at c24000000 (32-bit, prefetchable) [size=16M]
     Region 1: Memory at c25000000 (32-bit, non-prefetchable) [size=16K]
     Region 2: Memory at c25800000 (32-bit, non-prefetchable) [size=8M]
     Expansion ROM at c21030000 [disabled] [size=64K]
     Capabilities: [dc] Power Management version 1
         Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA 
PME(D0-,D1-,D2-,D3hot-,D3cold-)
         Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
     Capabilities: [f0] AGP version 1.0
         Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 
64bit- FW- AGP3- Rate=x1,x2
         Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- 
Rate=<none>
     Kernel driver in use: mgag200

0001:05:0c.0 Display controller: Matrox Electronics Systems Ltd. MGA 
G200 AGP (rev 03)
     Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor
     Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx-
     Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- 
<TAbort- <MAbort- >SERR- <PERR- INTx-
     Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes
     Interrupt: pin A routed to IRQ 18
     Region 0: Memory at c26000000 (32-bit, prefetchable) [size=16M]
     Region 1: Memory at c27000000 (32-bit, non-prefetchable) [size=16K]
     Region 2: Memory at c27800000 (32-bit, non-prefetchable) [size=8M]
     Expansion ROM at c21040000 [disabled] [size=64K]
     Capabilities: [dc] Power Management version 1
         Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA 
PME(D0-,D1-,D2-,D3hot-,D3cold-)
         Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
     Capabilities: [f0] AGP version 1.0
         Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 
64bit- FW- AGP3- Rate=x1,x2
         Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- 
Rate=<none>
     Kernel driver in use: mgag200

xrandr

VGA-4-4 disconnected (normal left inverted right x axis y axis)
VGA-3-3 disconnected (normal left inverted right x axis y axis)
VGA-2-2 disconnected (normal left inverted right x axis y axis)
VGA-1-1 disconnected (normal left inverted right x axis y axis)

lspci -nnk | grep VGA

0001:05:00.0 VGA compatible controller [0300]: Matrox Electronics 
Systems Ltd. MGA G200 AGP [102b:0521] (rev 03)

Thanks,
Christian

-- 
Sent with BrassMonkey 34.3.2.1 
(https://github.com/chzigotzky/Web-Browsers-and-Suites-for-Linux-PPC/releases/tag/BrassMonkey_34.3.2.1)

Re: drm/mgag200: Fix big-endian support

From: Thomas Zimmermann <tzimmermann@suse.de>
Date: 2026-08-26 15:23:13 

Hi

Am 26.08.26 um 17:07 schrieb Christian Zigotzky:

Hello Thomas,

Thank you for your patch. Unfortunately the card doesn't work with the 
patched kernel.

dmesg | grep -i mga

[    2.307195] [drm] Initialized mgag200 1.0.0 for 0001:05:00.0 on 
minor 1
[    2.308649] mgag200 0001:05:00.0: [drm] Cannot find any crtc or sizes
[    2.309551] mgag200 0001:05:04.0: Invalid PCI ROM header signature: 
expecting 0xaa55, got 0xffff
[    2.310305] [drm] Initialized mgag200 1.0.0 for 0001:05:04.0 on 
minor 2
[    2.312660] mgag200 0001:05:04.0: [drm] Cannot find any crtc or sizes
[    2.313177] mgag200 0001:05:00.0: [drm] Cannot find any crtc or sizes
[    2.313640] mgag200 0001:05:08.0: Invalid PCI ROM header signature: 
expecting 0xaa55, got 0xffff
[    2.314357] [drm] Initialized mgag200 1.0.0 for 0001:05:08.0 on 
minor 3
[    2.317630] mgag200 0001:05:08.0: [drm] Cannot find any crtc or sizes
[    2.318185] mgag200 0001:05:0c.0: Invalid PCI ROM header signature: 
expecting 0xaa55, got 0xffff
[    2.318840] mgag200 0001:05:04.0: [drm] Cannot find any crtc or sizes
[    2.319345] [drm] Initialized mgag200 1.0.0 for 0001:05:0c.0 on 
minor 4
[    2.321014] mgag200 0001:05:0c.0: [drm] Cannot find any crtc or sizes
[    2.322400] mgag200 0001:05:08.0: [drm] Cannot find any crtc or sizes
[    2.327215] mgag200 0001:05:0c.0: [drm] Cannot find any crtc or sizes

lspci -vvv

0001:05:00.0 VGA compatible controller: Matrox Electronics Systems 
Ltd. MGA G200 AGP (rev 03) (prog-if 00 [VGA controller])
    Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor
    Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- 
ParErr- Stepping- SERR- FastB2B- DisINTx-
    Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- 
<TAbort- <MAbort- >SERR- <PERR- INTx-
    Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes
    Interrupt: pin A routed to IRQ 18
    Region 0: Memory at c20000000 (32-bit, prefetchable) [size=16M]
    Region 1: Memory at c21000000 (32-bit, non-prefetchable) [size=16K]
    Region 2: Memory at c21800000 (32-bit, non-prefetchable) [size=8M]
    Expansion ROM at c21010000 [disabled] [size=64K]
Could be that we have to enable access to the ROM first. That's why it 
returns only 0xffff. Does the card display output when you switch on the 
computer?

Best regards
Thomas


Capabilities: [dc] Power Management version 1
        Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA 
PME(D0-,D1-,D2-,D3hot-,D3cold-)
        Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
    Capabilities: [f0] AGP version 1.0
        Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 
64bit- FW- AGP3- Rate=x1,x2
        Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- 
Rate=<none>
    Kernel driver in use: mgag200

0001:05:04.0 Display controller: Matrox Electronics Systems Ltd. MGA 
G200 AGP (rev 03)
    Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor
    Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- 
ParErr- Stepping- SERR- FastB2B- DisINTx-
    Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- 
<TAbort- <MAbort- >SERR- <PERR- INTx-
    Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes
    Interrupt: pin A routed to IRQ 18
    Region 0: Memory at c22000000 (32-bit, prefetchable) [size=16M]
    Region 1: Memory at c23000000 (32-bit, non-prefetchable) [size=16K]
    Region 2: Memory at c23800000 (32-bit, non-prefetchable) [size=8M]
    Expansion ROM at c21020000 [disabled] [size=64K]
    Capabilities: [dc] Power Management version 1
        Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA 
PME(D0-,D1-,D2-,D3hot-,D3cold-)
        Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
    Capabilities: [f0] AGP version 1.0
        Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 
64bit- FW- AGP3- Rate=x1,x2
        Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- 
Rate=<none>
    Kernel driver in use: mgag200

0001:05:08.0 Display controller: Matrox Electronics Systems Ltd. MGA 
G200 AGP (rev 03)
    Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor
    Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- 
ParErr- Stepping- SERR- FastB2B- DisINTx-
    Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- 
<TAbort- <MAbort- >SERR- <PERR- INTx-
    Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes
    Interrupt: pin A routed to IRQ 18
    Region 0: Memory at c24000000 (32-bit, prefetchable) [size=16M]
    Region 1: Memory at c25000000 (32-bit, non-prefetchable) [size=16K]
    Region 2: Memory at c25800000 (32-bit, non-prefetchable) [size=8M]
    Expansion ROM at c21030000 [disabled] [size=64K]
    Capabilities: [dc] Power Management version 1
        Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA 
PME(D0-,D1-,D2-,D3hot-,D3cold-)
        Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
    Capabilities: [f0] AGP version 1.0
        Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 
64bit- FW- AGP3- Rate=x1,x2
        Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- 
Rate=<none>
    Kernel driver in use: mgag200

0001:05:0c.0 Display controller: Matrox Electronics Systems Ltd. MGA 
G200 AGP (rev 03)
    Subsystem: Matrox Electronics Systems Ltd. G200 Multi-Monitor
    Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- 
ParErr- Stepping- SERR- FastB2B- DisINTx-
    Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- 
<TAbort- <MAbort- >SERR- <PERR- INTx-
    Latency: 128 (4000ns min, 8000ns max), Cache Line Size: 32 bytes
    Interrupt: pin A routed to IRQ 18
    Region 0: Memory at c26000000 (32-bit, prefetchable) [size=16M]
    Region 1: Memory at c27000000 (32-bit, non-prefetchable) [size=16K]
    Region 2: Memory at c27800000 (32-bit, non-prefetchable) [size=8M]
    Expansion ROM at c21040000 [disabled] [size=64K]
    Capabilities: [dc] Power Management version 1
        Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA 
PME(D0-,D1-,D2-,D3hot-,D3cold-)
        Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
    Capabilities: [f0] AGP version 1.0
        Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 
64bit- FW- AGP3- Rate=x1,x2
        Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- 
Rate=<none>
    Kernel driver in use: mgag200

xrandr

VGA-4-4 disconnected (normal left inverted right x axis y axis)
VGA-3-3 disconnected (normal left inverted right x axis y axis)
VGA-2-2 disconnected (normal left inverted right x axis y axis)
VGA-1-1 disconnected (normal left inverted right x axis y axis)

lspci -nnk | grep VGA

0001:05:00.0 VGA compatible controller [0300]: Matrox Electronics 
Systems Ltd. MGA G200 AGP [102b:0521] (rev 03)

Thanks,
Christian
-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com
GF: Jochen Jaser, Andrew McDonald, (HRB 36809, AG Nürnberg)

Re: drm/mgag200: Fix big-endian support

From: Christian Zigotzky <hidden>
Date: 2026-08-26 17:31:31 

On 26 August 2026 at 05:23 pm, Thomas Zimmermann [off-list ref] wrote:

Hi

Could be that we have to enable access to the ROM first. That's why it returns only 0xffff. Does the card display output when you switch on the computer?

Best regards
Thomas

- - -

Hello Thomas,

No, the card doesn’t display output when I switch on the computer.

Cheers,
Christian

Re: drm/mgag200: Fix big-endian support

From: Thomas Zimmermann <tzimmermann@suse.de>
Date: 2026-08-27 06:36:32 

Hi

Am 26.08.26 um 19:30 schrieb Christian Zigotzky:
On 26 August 2026 at 05:23 pm, Thomas Zimmermann [off-list ref] wrote:

Hi

Could be that we have to enable access to the ROM first. That's why it returns only 0xffff. Does the card display output when you switch on the computer?

Best regards
Thomas

- - -

Hello Thomas,

No, the card doesn’t display output when I switch on the computer.
Attached you'll find another patch that also enables ROM access in the 
PCI config options.  I took the code out of the old matroxfb driver 
without further testing. Please try and report back on the results.

Best regards
Thomas



Cheers,
Christian
-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com
GF: Jochen Jaser, Andrew McDonald, (HRB 36809, AG Nürnberg)

Re: drm/mgag200: Fix big-endian support

From: Christian Zigotzky <hidden>
Date: 2026-08-27 16:39:25 

On 27/08/26 08:36, Thomas Zimmermann wrote:
Hi

Am 26.08.26 um 19:30 schrieb Christian Zigotzky:
quoted
On 26 August 2026 at 05:23 pm, Thomas Zimmermann 
[off-list ref] wrote:

Hi

Could be that we have to enable access to the ROM first. That's why 
it returns only 0xffff. Does the card display output when you switch 
on the computer?

Best regards
Thomas

- - -

Hello Thomas,

No, the card doesn’t display output when I switch on the computer.
Attached you'll find another patch that also enables ROM access in the 
PCI config options.  I took the code out of the old matroxfb driver 
without further testing. Please try and report back on the results.

Best regards
Thomas
Hello Thomas,

Thank you for your effort to solve the problem. Unfortunately, your new 
patch doesn't solve the problem either. The error outputs are the same 
as before.

Cheers,
Christian

-- 
Sent with BrassMonkey 34.3.2.1 (https://github.com/chzigotzky/Web-Browsers-and-Suites-for-Linux-PPC/releases/tag/BrassMonkey_34.3.2.1)

Re: drm/mgag200: Fix big-endian support

From: Thomas Zimmermann <tzimmermann@suse.de>
Date: 2026-08-28 05:58:01 

Hi

Am 27.08.26 um 18:38 schrieb Christian Zigotzky:
On 27/08/26 08:36, Thomas Zimmermann wrote:
quoted
Hi

Am 26.08.26 um 19:30 schrieb Christian Zigotzky:
quoted
On 26 August 2026 at 05:23 pm, Thomas Zimmermann 
[off-list ref] wrote:

Hi

Could be that we have to enable access to the ROM first. That's why 
it returns only 0xffff. Does the card display output when you switch 
on the computer?

Best regards
Thomas

- - -

Hello Thomas,

No, the card doesn’t display output when I switch on the computer.
Attached you'll find another patch that also enables ROM access in 
the PCI config options.  I took the code out of the old matroxfb 
driver without further testing. Please try and report back on the 
results.

Best regards
Thomas
Hello Thomas,

Thank you for your effort to solve the problem. Unfortunately, your 
new patch doesn't solve the problem either. The error outputs are the 
same as before.
Oh well. I assume it's a ROM for x86?   I guess the PPC firmware doesn't 
POST the graphics card, so the driver has to.  The power-up logic is 
given in Sec 4.3.3 of the MGA200 spec.  But TBH I won't have the time to 
work on it.  At best, I can help a bit if someone wants to address the 
problem.

Best regards
Thomas

Cheers,
Christian
-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com
GF: Jochen Jaser, Andrew McDonald, (HRB 36809, AG Nürnberg)

Re: drm/mgag200: Fix big-endian support

From: Christian Zigotzky <hidden>
Date: 2026-08-28 10:20:20 

On 28 August 2026 at 07:58 am, Thomas Zimmermann [off-list ref] wrote:

Hi

Oh well. I assume it's a ROM for x86?   I guess the PPC firmware doesn't POST the graphics card, so the driver has to.  The power-up logic is given in Sec 4.3.3 of the MGA200 spec.  But TBH I won't have the time to work on it.  At best, I can help a bit if someone wants to address the problem.

Best regards
Thomas

- - -

Hi,

Are there any Matrox cards with PowerPC roms?

Have a nice weekend,

Christian

Re: drm/mgag200: Fix big-endian support

From: Thomas Zimmermann <tzimmermann@suse.de>
Date: 2026-08-31 08:21:13 

Hi

Am 28.08.26 um 12:19 schrieb Christian Zigotzky:
On 28 August 2026 at 07:58 am, Thomas Zimmermann [off-list ref] wrote:

Hi

Oh well. I assume it's a ROM for x86?   I guess the PPC firmware doesn't POST the graphics card, so the driver has to.  The power-up logic is given in Sec 4.3.3 of the MGA200 spec.  But TBH I won't have the time to work on it.  At best, I can help a bit if someone wants to address the problem.

Best regards
Thomas

- - -

Hi,

Are there any Matrox cards with PowerPC roms?
To my knowledge there exist Matrox cards from old PPC Macs, but I don't 
know if any of them is a G200 that this driver would support.

Best regards
Thomas

Have a nice weekend,

Christian
-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com
GF: Jochen Jaser, Andrew McDonald, (HRB 36809, AG Nürnberg)
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