Re: Kernel Summit request for Discussion of future of ATA (libata) and IDE

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Hello, I wrote:
supported. I couldn't track down where that bit was actually defined in the first place, all the way back to ATA-1 it seems to be indicated as reserved. Actually, I'm not sure why the drive cares in the first place, it would seem like a pure host controller issue..
It goes back before IDE into the depths of the original compaq spec. When you have a device wired basically directly to the ISA bus (original IDE)
ISA has only 8/16-bit data bus, so it could not have mattered there...

Depends what a 32bit I/O looks like on the 16bit bus - timing wise.

Two 16-bit reads at addresses 0x1x0 and 0x1x2 with the programmed recovery time, IIRC... It's just occured to me that in case of the 16-bit bus it should be how the drive treated the accesses at address 0x1x2 with IOCS16 asserted that could have mattered. If it honored them, 32-bit I/O could have worked even on a dumb ISA "controller", if not -- no way (unless you really had *something* between the ISA and the IDE cable).

   Oh, -IOCS16 is driven by device, not host. I give up then. :-)

MBR, Sergei


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