Problems with PCI on 8280
scottwood at freescale.com
Fri Jan 18 09:02:14 EST 2008
Rune Torgersen wrote:
> Our problem is that we can only access the first 128MB of the
> prefetchable area.
> an access to 0x87ff_ffff works (after ioremap), while an access to
> 0x8800_0000 causes an bus error.
> trying to access 0x87FFFFFC -> 0x00000000
> trying to access 0x88000000 ->Machine check in kernel mode.
> Caused by (from SRR1=49030): Transfer error ack signal
> It is like the prefetch area is not set up correctly for ioremap.
> The PCI registers are set up correctly in u-boot, and we can access the
> whole prefetch area in u-boot without any problems.
Are you using cuImage, or a regular uImage with a device-tree-aware
u-boot? If the former, try commenting out the call to fixup_pci() in
arch/powerpc/boot/cuboot-pq2.c and let me know if that changes anything.
Otherwise, are you sure the kernel didn't move BARs around such that
there's no longer a PCI device mapped at 0x88000000 (or that the device
that is there has been disabled)?
Can you show the contents of the following big endian registers:
TESCR1 (0x10040), TESCR2 (0x10044), PCIBRx (0x101ac, 0x101b0), and
PCIMSKx (0x101c4, 0x101c8)
and the following little endian registers:
POTARx (0x10800, 0x10818, 0x10830), POBARx (0x10808, 0x10820, 0x10838),
POCMRx (0x10810, 0x10828, 0x10840), POESR (0x10084), PCI_EACR (0x10890),
and PCI_ECCR (0x108a0)
after the machine check happens?
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