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    SubjectRe: 2.6.18-rc1-mm1
    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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