READ_DMA timeouts caused by ALI southbridge (5.3-STABLE)

[Søren Schmidt]

Pertti Kosunen wrote:
> My READ_DMA timeout problem with 160GB disk partitially solved. Asus 
> A7A266 southbridge (ALi 1535D+) don't support DMA with LBA48. This is 
> somehow worked around with Windows drivers, so is same possible in 
> FreeBSD also?

I guess their "workaround" is to use PIO mode to access the portions 
that need 48bit access. There is currently no provision in ATA for doing 
this on a "quirk" basis, but that could be added at some time. I'll 
stick it on my TODO list...


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-Søren