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
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