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ATA PIO Mode: Difference between revisions
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→48 bit PIO: minor wording change
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m (→48 bit PIO: minor wording change) |
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# Send the "READ SECTORS EXT" command (0x24) to port 0x1F7: outb(0x1F7, 0x24)
Note on the "magic bits" sent to port 0x1f6: Bit 6 (value = 0x40) is the LBA bit. This must be set for either LBA28 or LBA48 transfers. It must be clear for CHS transfers. Any drive that can support LBA48 will ignore
To write sectors in 48 bit PIO mode, send command "WRITE SECTORS EXT" (0x34), instead. (As before, do not use REP OUTSW when writing.) And remember to do a Cache Flush after each write command completes.
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