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Re: [Qemu-devel]  Implement LSI53C895A quirks exposed by OpenServe
Re: [Qemu-devel]  Implement LSI53C895A quirks exposed by OpenServer (Justin Chevrier).
Mon, 24 Nov 2008 17:10:51 -0600
* Andrzej Zaborowski <address@hidden> [2008-11-12 10:50]:
> Revision: 5706
> Author: balrog
> Date: 2008-11-12 16:41:32 +0000 (Wed, 12 Nov 2008)
> Log Message:
> Implement LSI53C895A quirks exposed by OpenServer (Justin Chevrier).
> After going through the debug log and scratching my head for quite some
> time. I found the following:
> The problem was with this block move:
> lsi_scsi: SCRIPTS dsp=0fae8e50 opcode 01000028 arg 00f63c40
> lsi_scsi: DMA addr=0x00f63c40 len=36
> The number of bytes to be transferred (len) should be 40 which corresponds
> to the block transfer of length 0x28 (from opcode 01000028). Instead we
> have a length of 36 (0x24). The code responsible for this is (in
> if (count > s->current_dma_len)
> count = s->current_dma_len;
> Basically we're overwriting the length 40 with the value 36 which I
> think we just left over in that variable from an earlier transfer. In my
> patch below I initialize s->current_dma_len to s->dbc before we begin
> the DMA transfer during Data In phase.
> The attached patch gets Openserver 5.0.5 past the hardware detection
> (and it lists the hard drive to boot, woohoo). It appears to stop a
> little while later (doesn't seem SCSI related), but it's been so long since
> I've booted Openserver I'm not sure what's supposted to happen after the HW
> detection using the boot/root disks.
> Props go to Craig Ringer for the initial post and the code that he posted
> some of which is in this patch.
This patch breaks WinXP SP3 32-bit install to scsi device. After
attempting to format a partition on the scsi device, Windows says there
is an error formating the partition. If I revert the patch, formating
and installation to a scsi disk works ok.
I haven't dug into what part of the patch is breaking it just yet, but
plan to do so.
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx