Re: CONFIG_SCSI_SYM53C8XX_IOMAPPED

[Matthew Wilcox <willy@debian.org>]

On Thu, Sep 16, 2004 at 08:34:38PM +0200, Jens Schmalzing wrote:
> Sorry.  I got the message completely wrong.  I really was:
> 
> | PCI: Enabling device 0000:00:0c.0 (0000 -> 0003)
> | sym.0.12.0: MMIO base address disabled.

OK, so that's entirely different.  That happens if we read 0 directly
from the PCI BAR.  Mmmm.  I don't know how that would happen.  Actually,
I don't see why we consider 0 to be an invalid PCI address ... we should
probably be checking the length instead.

> > lspci -v of that device would be interesting to see.
> 
> | 0000:00:0c.0 SCSI storage controller: LSI Logic / Symbios Logic 53c810 (rev 02)
> |         Flags: bus master, medium devsel, latency 128, IRQ 13
> |         I/O ports at 1000 [size=256]
> |         [virtual] Memory at c0000000 (32-bit, non-prefetchable) [size=256]

I just picked up one of those from a friend:

0000:00:0b.0 SCSI storage controller: LSI Logic / Symbios Logic 53c810 (rev 02)
        Flags: bus master, medium devsel, latency 64, IRQ 10
        I/O ports at b400 [size=256]
        Memory at e3000000 (32-bit, non-prefetchable) [size=256]

> So I used them for a test kernel, built from kernel-source-2.6.8 and
> your little debugging patch applied.  What happened is this:
> 
> | map 0xc4000000 length 128 returned 0xf4000000
> 
> and the kernel initialized the SCSI controller correctly - as I could
> verify, this is due to the backported patch from 2.6.9-rc2 that Hollis
> Blanchard sent here earlier in Bug#271852.  So that problem will be
> solved in the next revision.

Urm.  I don't understand.  You said that you encountered the problem
in a Thinkpad 860, but bug 271852 refers to a powerpc-specific problem.

-- 
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