Re: What's the SB600 64-bit DMA problem?

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Tejun Heo <htejun@xxxxxxxxx> wrote:
> George Spelvin wrote:
>> But...
>> The base addresses are already above 4G.  Aobve 8G, actually.
>> 
>> Port 0 base addresses: 02 1f1e 0000, 02 1f1e 0400
>> Port 1 base addresses: 02 1f1a 0000, 02 1f1a 0400
>> Port 2 base addresses: 02 1f98 0000, 02 1f98 0400
>> Port 3 base addresses: 02 1f9e 0000, 02 1f9e 0400
>
> Where are these numbers from?

A dump of the appropriate region of memory (1k @ 0xfe7ff800), offsets
0x100, 0x180, 0x200 and 0x280.  Here's a full dump (rebooted in between,
so the addresses might change).

dd if=/dev/mem bs=1024 skip=4169726 count=1 | od -Ax -tx4
1+0 records in
1+0 records out
1024 bytes (1.0 kB) copied, 0.000203726 s, 5.0 MB/s
000000 f722ff83 80000002 00000000 0000000f
000010 00010100 000101f8 00000000 00000000
000020 00000000 00000000 00000000 00000000
*
0000f0 00000000 00000000 00000000 03ef99fc
000100 1f1e0000 00000002 1f1e0400 00000002
000110 00000000 7840007f 00042017 00000000
000120 00000040 00000101 00000113 00000300
000130 00000000 00000000 00000000 00000000
000140 0001000f 00000000 00000000 00000000
000150 00000000 00000000 00000000 00000000
*
000170 00000000 00000000 00000000 08001c00
000180 1f1a0000 00000002 1f1a0400 00000002
000190 00000000 7840007f 0004a017 00000000
0001a0 00000040 00000101 00000113 00000300
0001b0 00000000 00000001 00000000 00000000
0001c0 0001000f 00000000 00000000 00000000
0001d0 00000000 00000000 00000000 00000000
*
0001f0 00000000 00000000 00000000 08001c00
000200 1f980000 00000002 1f980400 00000002
000210 00000000 7840007f 00042017 00000000
000220 00000040 00000101 00000113 00000300
000230 00000000 00000000 00000000 00000000
000240 0001000f 00000000 00000000 00000000
000250 00000000 00000000 00000000 00000000
*
000270 00000000 00000000 00000000 08001c00
000280 1f9e0000 00000002 1f9e0400 00000002
000290 00000000 7840007f 00042017 00000000
0002a0 00000040 00000101 00000113 00000300
0002b0 00000000 00000000 00000000 00000000
0002c0 0001000f 00000000 00000000 00000000
0002d0 00000000 00000000 00000000 00000000
*
0002f0 00000000 00000000 00000000 08001c00
000300 00000000 00000000 00000000 00000000
*
000400

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