[Qemu-devel] SCSI bus failures with qemu-arm in kernel 3.8+

On Mon, Aug 12, 2013 at 09:49:54PM +0100, Peter Maydell wrote:

On 12 August 2013 21:06, Russell King - ARM Linux
[off-list ref] wrote:

quoted

On Mon, Aug 12, 2013 at 06:33:28PM +0100, Peter Maydell wrote:

quoted

    /* Slot to IRQ mapping for RealView EB and PB1176 backplane
     *      name    slot    IntA    IntB    IntC    IntD
     *      A       31      IRQ50   IRQ51   IRQ48   IRQ49
     *      B       30      IRQ49   IRQ50   IRQ51   IRQ48
     *      C       29      IRQ48   IRQ49   IRQ50   IRQ51
     * Slot C is for the host bridge; A and B the peripherals.
     * Our output irqs 0..3 correspond to the baseboard's 48..51.
     */

ie IRQ48 == board's PCI0 == slot C connector A6 (IntA) == PCI_nINTB
   == Slot B connector B8 (IntD) == Slot A connector A7 (IntC).

and so on round.

The 926's routing is one extra round of swizzling because the
board itself connects FPGA P_nINTA to its edge connector's
INTB (B7) pin rather than INTA (A6) as the EB/1176 do.
(This isn't even hinted at in the documentation, you need to
either experiment or look at the 926 board schematic.)

Okay, so the above just adds to the confusion, because you appear to be
mistaking "slot" for the AD signal which the IDSEL pin is connected to.

The board TRM:
http://infocenter.arm.com/help/topic/com.arm.doc.dui0411d/Cacdijji.html
says that "slot position" and "AD signal connected to IDSEL"
are the same thing:

That's realview, not versatile.  Are you saying that both are exactly
the same wrt this?

I don't currently have the h/w set up, but digging in my email
archives, when we were running the kernel on the real PB926
h/w and backplane it was indeed reporting the PCI core (ie
"slot C") as 29, and the other two as 30 and 31:
[  128.920150] PCI core found (slot 29)
[  128.920875] pci 0000:00:1f.0: reg 10: [io  0x0af0-0x0aff]
[  128.920958] pci 0000:00:1f.0: reg 14: [io  0x0a70-0x0a7f]
[  128.921032] pci 0000:00:1f.0: reg 18: [io  0x01f0-0x01ff]
[  128.921103] pci 0000:00:1f.0: reg 1c: [io  0x0170-0x017f]
[  128.921173] pci 0000:00:1f.0: reg 20: [io  0xcc00-0xcc1f]
[  128.921244] pci 0000:00:1f.0: reg 24: [io  0x8c00-0x8cff]
[  128.921320] pci 0000:00:1f.0: reg 30: [mem 0xffff0000-0xffffffff pref]

With realview or versatile?