Messages in this thread | | | Date | Sun, 09 Jul 2006 12:29:10 -0400 | From | Jeff Garzik <> | Subject | Re: 2.6.18-rc1-mm1 |
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Alan Cox wrote: > The old drivers/ide code uses much longer delays than the spec for some > ATAPI commands, and it looks as if there is a good reason for doing > so ...
FWIW, the code that ATADRVR (http://www.ata-atapi.com/) uses to issue commands does something like
write Command register to start command if (device == ATAPI) # i.e. not ATA delay(150 msec) pound Status / AltStatus, kick DMA engine, whatever else
ATADRVR is open code (for an MS-DOS-level driver), and really worth a read. Between ATADRVR and drivers/ide, you get a pretty good idea about what __field experience__ has shown is needed for ATAPI devices.
Jeff
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