Alan,
>>> Only relevant for DMA really
>> So rqsize is only needed for DMA accesses?
>
> PIO transfers are sector at a time, or multi-sector up to a usual limit
> of about 16 sectors.
So again: rqsize does not matter for PIO transfer?
Looking at the lines
if (hwif->no_lba48_dma && lba48 && dma) {
if (block + rq->nr_sectors > 1ULL << 28)
dma = 0;
else
lba48 = 0;
}
in drivers/ide/ide-disk.c. Does that mean that 48bit LBA adressing using the
task_ioreg_t stuff is only used for sector numbers larger 1 << 28?
Thus for small HDDs only LBA28 ist used by
hwif->OUTB(block, IDE_SECTOR_REG);
hwif->OUTB(block>>=8, IDE_LCYL_REG);
hwif->OUTB(block>>=8, IDE_HCYL_REG);
???
Thanks a million!!!!
Steven
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