>       hda: status timeout: status=0xd0 { Busy }
>       ide: failed opcode was: unknown
>       hda: no DRQ after issuing MULTWRITE_EXT
>       ide0: unexpected interrupt, status=0x80, count=1
>       ide0: reset: success
> 
> ) sometimes when rqsize is set to 65536 altough I only do PIO transfer?

If your hardware support for LBA48 is broken and you've not disabled
LBA48 then your hardware will do many strange things. 

If however the hwif->no_lba48 is set then drive->addressing ends up as 0
so LBA48 commands should never be issued and rqsize should never get >
256.

Alan
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