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Re: Cores Digest, Vol 41, Issue 4
by Unknown on Apr 13, 2007 |
Not available! | ||
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H. Peter Anvin Wrote:
First of all, 48-bit LBA applies to ATA, *not* to ATAPI (which is
basically SCSI commands carried over an ATA transport.) True that. I more talking about the specification version, which contains both ATA/ATAPI.
ATA is pretty much designed so that the HBA can be very dumb. All
problems with 48-bit LBA I've seen have been with "smart" cores than do more than just provide a basic bus interface. Yeah, they made it pretty easy to implement the host. Good to know that you haven't seen many problems.
Modulo bugs, I don't see any reason why a current single-port ATA HBA
should ever have to be updated, because ATA is unlikely to progress any further, having been supplanted by SATA. Good point. I was just curious because I haven't fully implemented it yet and it hadn't been updated in years.
It's worth noting that although there are SATA controllers which mimic
ATA controllers, they are *very* different standards, and those controllers have complex emulation in hardware. Furthermore, native SATA controllers have much better performance. They do, however, require very different (and much more complex) driver support. -hpa Good to know. Thanks for your response! Chris Edmiston |
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