[coreboot] Only UDMA/33 PATA on m57sli, UDMA/66 with factory BIOS

[Harald Gutmann]

> Found!
>
> According to some kernel sources and the differences in the pci-registers
> between proprietary bios and coreboot there are two values which are
> needed:
>
> AMD_CABLE_DETECT = 0x42
> AMD_UDMA_TIMING = 0x50
>
> But, for PCI_VENDOR_ID_NVIDIA an offset of 0x10 has to be added, which
> means: AMD_CABLE_DETECT = 0x52
> AMD_UDMA_TIMING = 0x60
>
> PCI registers on coreboot address 0x52 (from the IDE device) has value FF
> while proprietary has value 99. This is the so called "CABLE_BIT".
>
> And as the second stuff needed, the AMD_UDMA_TIMING registers is as
> follows: The kernel reads the whole address range from 0x60-0x92 and does
> some magic stuff to verify if everything is correct.
>
> On the proprietary bios we have in this range in the pci-registers:
> 60: 00 00 c5 c7 00 00 00 00 00 00 00 00 00 00 00 00
> On coreboot we have:
> 60: 00 00 c0 c0 00 00 00 00 00 00 00 00 00 00 00 00
>
> Thats what to do, but when? - Maybe tomorrow.

Oh, I wanted to attach some files here so it's easy to verify.
amd_cable_detect.c is some cp&paste from amd_74xx.c under drivers/ide from the 
linux sources.

> > //Peter
>
> Regards,
> Harald

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00:04.0 IDE interface: nVidia Corporation MCP55 IDE (rev a1)
00: de 10 6e 03 05 00 b0 00 a1 8a 01 01 00 00 00 00
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: c1 3c 00 00 00 00 00 00 00 00 00 00 22 10 80 2b
30: 00 00 00 00 44 00 00 00 00 00 00 00 00 00 03 01
40: 22 10 80 2b 01 00 02 00 00 00 00 00 00 00 00 00
50: 02 f0 00 00 00 00 00 00 a8 a8 20 20 0f 00 ff 20
60: 00 00 c0 c0 00 00 00 00 00 00 00 00 00 00 00 00
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
80: 00 00 00 00 00 e0 20 f0 00 00 02 30 00 00 00 00
90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 01
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f0: 00 00 00 00 00 00 00 00 1c 00 00 00 00 00 00 00

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00:04.0 IDE interface: nVidia Corporation MCP55 IDE (rev a1)
00: de 10 6e 03 05 00 b0 00 a1 8a 01 01 00 00 00 00
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 01 f0 00 00 00 00 00 00 00 00 00 00 58 14 02 50
30: 00 00 00 00 44 00 00 00 00 00 00 00 00 00 03 01
40: 58 14 02 50 01 00 02 00 00 00 00 00 00 00 00 00
50: 02 f0 00 00 00 00 00 00 a8 a8 20 20 0a 00 99 20
60: 00 00 c5 c7 00 00 00 00 00 00 00 00 00 00 00 00
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
80: 00 00 00 00 00 50 ca 23 00 00 02 00 00 00 00 00
90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 01
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f0: 00 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00

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