Re: [PATCH] PCI fixup for old NCR 53C810 SCSI chips, kernel 2.4.18

[Geert Uytterhoeven]

On Mon, 1 Apr 2002, Graham Cobb wrote:
> This patch fixes a problem which prevents any version of the 2.4 kernel 
> running on DECpc XL systems (from c. 1993).  On that system, the NCR 
> 53C810 SCSI subsystem integrated on the motherboard does not have a PCI 
> class code, which breaks PCI resource allocation in all 2.4 kernels. 
>  The symptom is "resource collisions" reported for the SCSI device:
> 
> PCI: Device 00:01.0 not available because of resource collisions
> 
> These systems typically only have SCSI disks so the 2.4 kernel cannot be 
> booted.
> 
> If you are running an earlier kernel and want to know if you will have 
> this problem when upgrading, use lspci -vvv and look for output similar 
> to this:
> 
> 00:01.0 Non-VGA unclassified device: Symbios Logic Inc. (formerly NCR) 
> 53c810 (rev 01)
>     Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
> Stepping- SERR- FastB2B-
>     Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- 
> <TAbort- <MAbort- >SERR- <PERR-
>     Latency: 4 set
>     Interrupt: pin A routed to IRQ 11
>     Region 0: I/O ports at d000
> 
> If the listing says "Non-VGA unclassified device" for the 53c810, it 
> will not work with the 2.4 kernel.
> 
> The workround is to add fixup code for this device in 
> arch/i386/kernel/pci-pc.c.  The patch is small and is included below.  I 
> would appreciate anyone who uses NCR 53c810-based SCSI devices testing 
> this patch to make sure it doesn't break any other configurations.
> Graham Cobb

This problem seems not to be limited to ia32: on my DEC UDB AXP-box (on which I
never tried 2.4.x so far), lspci shows:

| 00:06.0 Non-VGA unclassified device: Symbios Logic Inc. (formerly NCR) 53c810 (rev 01)
|	Flags: bus master, medium devsel, latency 255, IRQ 11
|	I/O ports at 8000
|	Memory at 0000000004200000 (32-bit, non-prefetchable)

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [e-mail]

In personal conversations with technical people, I call myself a hacker. But
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							    -- Linus Torvalds