Attached is a real world reason why we need a VGA control device.
VesaFB loads and marks the VGA screen region as reserved. The driver
does not attach to any device.

My new radeon DRM driver load and says no one is using the radeon card,
so it can drive it. Radeon loads and fails. It can attach the PCI
device but it can't reserve the memory block.

The short term fix for this is to make VesaFB aware of the PCI ROM
patch. The PCI ROM patch makes it possible to identify the boot video
device. Once VesaFB can identify the boot video device it can properly
attach itself to both the device and memory. Then DRM radeon loads
after vesafb it will find the PCI device already has a driver attached
and revert back into stealth compatibility mode.

Long term we need the vga control device and a unified DRM/fbdev.

The immediate work around is to use the radeonfb driver instead of
vesafb. The radeonfb driver marks the PCI device in use and triggers
stealth mode in radeon.

--- Alex Romosan <romosan@sycorax.lbl.gov> wrote:

To: Dave Airlie <redacted>
CC: dri-devel@lists.sourceforge.net
Subject: Re: r200 oops
From: Alex Romosan <redacted>
Date: Thu, 19 Aug 2004 17:59:51 -0700

Dave Airlie [off-list ref] writes:

quoted

can you insert the module with drm_opts=debug option and see what

it

quoted

says..

[drm] Debug messages ON
ACPI: PCI interrupt 0000:01:00.0[A] -> GSI 4 (level, low) -> IRQ 4
[drm:radeon_register_regions] *ERROR* cannot reserve FB region
Unable to handle kernel NULL pointer dereference at virtual address
00000000
 printing eip:
e1195520
*pde = 00000000
Oops: 0002 [#1]
PREEMPT
Modules linked in: radeon sd_mod scsi_mod autofs4 microcode aes_i586
airo ehci_hcd uhci_hcd usbcore parport_pc parport irtty_sir sir_dev
irda crc_ccitt joydev evdev nls_iso8859_1 ntfs yenta_socket
CPU:    0
EIP:    0060:[<e1195520>]    Not tainted
EFLAGS: 00010246   (2.6.8.1)
EIP is at radeon_stub_putminor+0x20/0x110 [radeon]
eax: 00000000   ebx: 00000000   ecx: 00000000   edx: 00000000
esi: 00000000   edi: ffffffea   ebp: dc479e6c   esp: dc479e5c
ds: 007b   es: 007b   ss: 0068
Process insmod (pid: 2118, threadinfo=dc478000 task=df6e0cd0)
Stack: dc479e78 00000000 00000000 00000000 dc479e84 e1195913 e11a363a
e11a00f3
       00000000 e11ab9e0 dc479ed0 e1191488 e11a37f0 e119fed0 dc479eac
c017c056
       41254b8f dbbab424 db054540 00000000 e11a9e18 c15c9c00 00000000
dbbab424
Call Trace:
 [<c010545a>] show_stack+0x7a/0x90
 [<c01055d9>] show_registers+0x149/0x1a0
 [<c010576d>] die+0x8d/0x100
 [<c0114465>] do_page_fault+0x1e5/0x567
 [<c01050f5>] error_code+0x2d/0x38
 [<e1195913>] radeon_stub_unregister+0x33/0x60 [radeon]
 [<e1191488>] drm_probe+0x208/0x270 [radeon]
 [<c01cc9d9>] pci_device_probe_static+0x49/0x60
 [<c01cca27>] __pci_device_probe+0x37/0x50
 [<c01cca66>] pci_device_probe+0x26/0x50
 [<c0211f75>] bus_match+0x35/0x70
 [<c02120a9>] driver_attach+0x59/0x90
 [<c021254c>] bus_add_driver+0x8c/0xb0
 [<c0212a6b>] driver_register+0x2b/0x30
 [<c01ccc99>] pci_register_driver+0x59/0x80
 [<e0fee09d>] drm_init+0x9d/0xd7 [radeon]
 [<c012e178>] sys_init_module+0xf8/0x210
 [<c0104f4b>] syscall_call+0x7/0xb
Code: c7 04 10 00 00 00 00 a1 f0 d7 1a e1 89 4c 10 04 a1 f0 d7 1a
 Segmentation fault

quoted

can you also send on lspci -v and the contents of /proc/iomem

lspci -v:

0000:00:00.0 Host bridge: Intel Corp. 82855PM Processor to I/O
Controller (rev 03)
	Subsystem: IBM: Unknown device 0529
	Flags: bus master, fast devsel, latency 0
	Memory at d0000000 (32-bit, prefetchable) [size=256M]
	Capabilities: [e4] #09 [f104]
	Capabilities: [a0] AGP version 2.0

0000:00:01.0 PCI bridge: Intel Corp. 82855PM Processor to AGP
Controller (rev 03) (prog-if 00 [Normal decode])
	Flags: bus master, 66MHz, fast devsel, latency 96
	Bus: primary=00, secondary=01, subordinate=01, sec-latency=64
	I/O behind bridge: 00003000-00003fff
	Memory behind bridge: c0100000-c01fffff
	Prefetchable memory behind bridge: e0000000-e7ffffff

0000:00:1d.0 USB Controller: Intel Corp. 82801DB/DBL/DBM
(ICH4/ICH4-L/ICH4-M) USB UHCI Controller #1 (rev 01) (prog-if 00
[UHCI])
	Subsystem: IBM: Unknown device 052d
	Flags: bus master, medium devsel, latency 0, IRQ 4
	I/O ports at 1800 [size=32]

0000:00:1d.1 USB Controller: Intel Corp. 82801DB/DBL/DBM
(ICH4/ICH4-L/ICH4-M) USB UHCI Controller #2 (rev 01) (prog-if 00
[UHCI])
	Subsystem: IBM: Unknown device 052d
	Flags: bus master, medium devsel, latency 0, IRQ 9
	I/O ports at 1820 [size=32]

0000:00:1d.2 USB Controller: Intel Corp. 82801DB/DBL/DBM
(ICH4/ICH4-L/ICH4-M) USB UHCI Controller #3 (rev 01) (prog-if 00
[UHCI])
	Subsystem: IBM: Unknown device 052d
	Flags: bus master, medium devsel, latency 0, IRQ 6
	I/O ports at 1840 [size=32]

0000:00:1d.7 USB Controller: Intel Corp. 82801DB/DBM (ICH4/ICH4-M)
USB 2.0 EHCI Controller (rev 01) (prog-if 20 [EHCI])
	Subsystem: IBM: Unknown device 052e
	Flags: bus master, medium devsel, latency 0, IRQ 11
	Memory at c0000000 (32-bit, non-prefetchable) [size=1K]
	Capabilities: [50] Power Management version 2
	Capabilities: [58] #0a [2080]

0000:00:1e.0 PCI bridge: Intel Corp. 82801 PCI Bridge (rev 81)
(prog-if 00 [Normal decode])
	Flags: bus master, fast devsel, latency 0
	Bus: primary=00, secondary=02, subordinate=08, sec-latency=64
	I/O behind bridge: 00004000-00008fff
	Memory behind bridge: c0200000-cfffffff
	Prefetchable memory behind bridge: e8000000-efffffff

0000:00:1f.0 ISA bridge: Intel Corp. 82801DBM LPC Interface
Controller (rev 01)
	Flags: bus master, medium devsel, latency 0

0000:00:1f.1 IDE interface: Intel Corp. 82801DBM (ICH4) Ultra ATA
Storage Controller (rev 01) (prog-if 8a [Master SecP PriP])
	Subsystem: IBM: Unknown device 052d
	Flags: bus master, medium devsel, latency 0, IRQ 6
	I/O ports at <unassigned>
	I/O ports at <unassigned>
	I/O ports at <unassigned>
	I/O ports at <unassigned>
	I/O ports at 1860 [size=16]
	Memory at 20000000 (32-bit, non-prefetchable) [size=1K]

0000:00:1f.3 SMBus: Intel Corp. 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M)
SMBus Controller (rev 01)
	Subsystem: IBM: Unknown device 052d
	Flags: medium devsel, IRQ 5
	I/O ports at 1880 [size=32]

0000:00:1f.5 Multimedia audio controller: Intel Corp. 82801DB/DBL/DBM
(ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller (rev 01)
	Subsystem: IBM: Unknown device 0537
	Flags: bus master, medium devsel, latency 0, IRQ 5
	I/O ports at 1c00 [size=256]
	I/O ports at 18c0 [size=64]
	Memory at c0000c00 (32-bit, non-prefetchable) [size=512]
	Memory at c0000800 (32-bit, non-prefetchable) [size=256]
	Capabilities: [50] Power Management version 2

0000:00:1f.6 Modem: Intel Corp. 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M)
AC'97 Modem Controller (rev 01) (prog-if 00 [Generic])
	Subsystem: IBM: Unknown device 0525
	Flags: bus master, medium devsel, latency 0, IRQ 5
	I/O ports at 2400 [size=256]
	I/O ports at 2000 [size=128]
	Capabilities: [50] Power Management version 2

0000:01:00.0 VGA compatible controller: ATI Technologies Inc Radeon
R250 Lf [Radeon Mobility 9000 M9] (rev 02) (prog-if 00 [VGA])
	Subsystem: IBM: Unknown device 0531
	Flags: bus master, stepping, fast Back2Back, 66MHz, medium devsel,
latency 66, IRQ 4
	Memory at e0000000 (32-bit, prefetchable) [size=128M]
	I/O ports at 3000 [size=256]
	Memory at c0100000 (32-bit, non-prefetchable) [size=64K]
	Capabilities: [58] AGP version 2.0
	Capabilities: [50] Power Management version 2

0000:02:00.0 CardBus bridge: Texas Instruments PCI1520 PC card
Cardbus Controller (rev 01)
	Subsystem: IBM ThinkPad T30/T40
	Flags: bus master, medium devsel, latency 168, IRQ 4
	Memory at b0000000 (32-bit, non-prefetchable) [size=4K]
	Bus: primary=02, secondary=03, subordinate=06, sec-latency=176
	Memory window 0: 20400000-207ff000 (prefetchable)
	Memory window 1: 20800000-20bff000
	I/O window 0: 00004000-000040ff
	I/O window 1: 00004400-000044ff
	16-bit legacy interface ports at 0001

0000:02:00.1 CardBus bridge: Texas Instruments PCI1520 PC card
Cardbus Controller (rev 01)
	Subsystem: IBM ThinkPad T30/T40
	Flags: bus master, medium devsel, latency 168, IRQ 5
	Memory at b1000000 (32-bit, non-prefetchable) [size=4K]
	Bus: primary=02, secondary=07, subordinate=0a, sec-latency=176
	Memory window 0: 20c00000-20fff000 (prefetchable)
	Memory window 1: 21000000-213ff000
	I/O window 0: 00004800-000048ff
	I/O window 1: 00004c00-00004cff
	16-bit legacy interface ports at 0001

0000:02:01.0 Ethernet controller: Intel Corp. 82540EP Gigabit
Ethernet Controller (Mobile) (rev 03)
	Subsystem: IBM PRO/1000 MT Mobile Connection
	Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 4
	Memory at c0220000 (32-bit, non-prefetchable) [size=128K]
	Memory at c0200000 (32-bit, non-prefetchable) [size=64K]
	I/O ports at 8400 [size=64]
	Capabilities: [dc] Power Management version 2
	Capabilities: [f0] Message Signalled Interrupts: 64bit+ Queue=0/0
Enable-

0000:02:02.0 Network controller: AIRONET Wireless Communications
Cisco Aironet Wireless 802.11b
	Subsystem: AIRONET Wireless Communications: Unknown device 5000
	Flags: bus master, fast devsel, latency 64, IRQ 6
	I/O ports at 8000 [size=256]
	Memory at c0210000 (32-bit, non-prefetchable) [size=16K]
	Memory at c0400000 (32-bit, non-prefetchable) [size=4M]
	Capabilities: [40] Power Management version 2
	Capabilities: [48] Vital Product Data

/proc/iomem:

00000000-0009efff : System RAM
0009f000-0009ffff : reserved
000a0000-000bffff : Video RAM area
000c0000-000cffff : Video ROM
000e0000-000effff : Extension ROM
000f0000-000fffff : System ROM
00100000-1ff5ffff : System RAM
  00100000-003056de : Kernel code
  003056df-003dd13f : Kernel data
1ff60000-1ff76fff : ACPI Tables
1ff77000-1ff78fff : ACPI Non-volatile Storage
1ff80000-1fffffff : reserved
20000000-200003ff : 0000:00:1f.1
20400000-207fffff : PCI CardBus #03
20800000-20bfffff : PCI CardBus #03
20c00000-20ffffff : PCI CardBus #07
21000000-213fffff : PCI CardBus #07
b0000000-b0000fff : 0000:02:00.0
  b0000000-b0000fff : yenta_socket
b1000000-b1000fff : 0000:02:00.1
  b1000000-b1000fff : yenta_socket
c0000000-c00003ff : 0000:00:1d.7
  c0000000-c00003ff : ehci_hcd
c0000800-c00008ff : 0000:00:1f.5
  c0000800-c00008ff : Intel 82801DB-ICH4 - Controller
c0000c00-c0000dff : 0000:00:1f.5
  c0000c00-c0000dff : Intel 82801DB-ICH4 - AC'97
c0100000-c01fffff : PCI Bus #01
  c0100000-c010ffff : 0000:01:00.0
    c0100000-c010ffff : radeon
c0200000-c020ffff : 0000:02:01.0
  c0200000-c020ffff : e1000
c0210000-c0213fff : 0000:02:02.0
  c0210000-c0213fff : eth1
c0220000-c023ffff : 0000:02:01.0
  c0220000-c023ffff : e1000
c0400000-c07fffff : 0000:02:02.0
  c0400000-c043ffff : eth1
d0000000-dfffffff : 0000:00:00.0
e0000000-e7ffffff : PCI Bus #01
  e0000000-e7ffffff : 0000:01:00.0
    e0000000-e059b8bf : vesafb
ff800000-ffffffff : reserved

i am sending the laptop back to ibm so i won't be able to run any
tests for a while. hope this helps.

--alex--

-- 
| I believe the moment is at hand when, by a paranoiac and active |
|  advance of the mind, it will be possible (simultaneously with  |
|  automatism and other passive states) to systematize confusion  |
|  and thus to help to discredit completely the world of reality. |


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