2.3 on 850

[Gabriel Paubert]

On Fri, 10 Mar 2000, David Monro wrote:

> Having finally managed to get a shell on this thing using a floppy for
> the root fs:
> /proc/ioports:
> 000001f0-000001f0 : ide0
> 000001f1-000001f1 : ide0
> 000001f2-000001f2 : ide0
> 000001f3-000001f3 : ide0
> 000001f4-000001f4 : ide0
> 000001f5-000001f5 : ide0
> 000001f6-000001f6 : ide0
> 000001f7-000001f7 : ide0

Wow why not 1f0-1f7 ?

> 000002f8-000002ff : serial(auto)
> 000003f6-000003f6 : ide0
> 000003f8-000003ff : serial(auto)
> 00001000-00001007 : IBM Fire Coral
> 00009032-00009032 : ide0
> 01000200-0100021f : Advanced Micro Devices [AMD] 79c970 [PCnet LANCE]
>
> /proc/iomem:
> 000c0000-000cffff : S3 Inc. 86c864 [Vision 864 DRAM] vers 1
> 013fff00-013fffff : Symbios Logic Inc. (formerly NCR) 53c825
>
> /proc/pci (don't have lspci on floppy):

no problem, cat /proc/pci is enough...

> PCI devices found:
>   Bus  0, device   0, function  0:
>     Host bridge: Motorola MPC105 [Eagle] (rev 36).
>   Bus  0, device  11, function  0:
>     ISA bridge: IBM Fire Coral (rev 2).
>       I/O at 0x1000 [0x1007].
>   Bus  0, device  12, function  0:
>     Ethernet controller: Advanced Micro Devices [AMD] 79c970 [PCnet LANCE] (rev 22).
>       IRQ 15.
>       Master Capable.  Latency=211.  Min Gnt=6.Max Lat=255.
>       I/O at 0x1000200 [0x100021f].
>       Non-prefetchable 32 bit memory at 0x0 [0x1f].
>   Bus  0, device  14, function  0:
>     VGA compatible unclassified device: S3 Inc. 86c864 [Vision 864 DRAM]
> vers 1 (rev 0).
>       IRQ 10.
>       Non-prefetchable 32 bit memory at 0x0 [0x7fffff].

Not allocated, setting a base register to 0 disables the corresponding
decoder in theory, but many devices forget that PCI spec requirement...

>   Bus  0, device  18, function  0:
>     SCSI storage controller: Symbios Logic Inc. (formerly NCR) 53c825
> (rev 2).
>       IRQ 10.
>       Master Capable.  Latency=128.
>       I/O at 0x1000000 [0x200000ff].

Wow, that's definitely a bug I had not noticed. When remapping, both the
start and end of the resource struct should be modified, else it looks
like it uses from 0x1000000 to 0x200000ff, or 512Mb - 16Mb + 256b which is
quite funny. The fix is easy: modify both the start and end of the
resource in arch/ppc/kernel/prep_pci.c in the loop with the "relocating"
message. It won't prevent conflicts from happening however...


>       Non-prefetchable 32 bit memory at 0x13fff00 [0x13fffff].
>   Bus  0, device  22, function  0:
>     VGA compatible controller: Weitek P9100 (rev 0).
>       IRQ 10.
>       Non-prefetchable 32 bit memory at 0x1000000 [0x1ffffff].

These two overlap.

>
> As you can see, it's a bit of a mess! I've no idea what it thinks is in
> the way of the second set of ide ports. The end address of the '825 I/O
> regioin hasn't been remapped, so it clashes with the lance. The lance
> and the S3 864 both have memory at 0x0? and the memory area for the 825
> is right in the middle of the P9100 area. Yuck!

As you say (only memory at zero is not a problem if devices are
correctly implemented)...



>
> It looks a little bit different (and somewhat saner) under 2.2:
> /proc/ioports:
> 0000-001f : dma1
> 0020-003f : pic1
> 0040-005f : timer
> 0074-007b : PReP NVRAM
> 0080-008f : dma page reg
> 00a0-00bf : pic2
> 00c0-00df : dma2
> 0170-0177 : ide1
> 01f0-01f7 : ide0
> 02f8-02ff : serial(set)
> 0376-0376 : ide1
> 03f6-03f6 : ide0
> 03f8-03ff : serial(set)
> 1000200-100021f : PCnet/PCI II 79C970A
>
>
> lspci -v
> 00:00.0 Host bridge: Motorola MPC105 [Eagle] (rev 24)
>         Flags: bus master, fast devsel, latency 0
>
> 00:0b.0 ISA bridge: IBM Fire Coral (rev 02)
>         Flags: bus master, slow devsel, latency 0
>         I/O ports at 1000
>
> 00:0c.0 Ethernet controller: Advanced Micro Devices [AMD] 79c970 [PCnet
> LANCE] (rev 16)
>         Flags: bus master, medium devsel, latency 211, IRQ 15
>         I/O ports at 1000200
>
> 00:0e.0 VGA compatible unclassified device: S3 Inc. 86c864 [Vision 864
> DRAM] vers 1
>         Flags: medium devsel, IRQ 10
>         Expansion ROM at 000c0000 [disabled]
>
> 00:12.0 SCSI storage controller: Symbios Logic Inc. (formerly NCR)
> 53c825 (rev 02)
>         Flags: medium devsel, IRQ 10
>         I/O ports at 1000000 [disabled]
>         Memory at 013fff00 (32-bit, non-prefetchable) [disabled]
>
> 00:16.0 VGA compatible controller: Weitek P9100 (prog-if 00 [VGA])
>         Flags: stepping, medium devsel, IRQ 10
>         Memory at 01000000 (32-bit, non-prefetchable)

Still conflicts with the memory from the 53c825. No problem as long as
it's disabled.

>         Expansion ROM at 000c0000 [disabled]
>

	Gabriel.

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