Paul Gortmaker wrote:
>
> > To Do
> > -----
> > Linux sends a 1K buffer with SCSI inquiries. The ANSI-SCSI limit is 255.
>
> [snip]
>
> > Linux uses TEST_UNIT_READY to chck for device presence on a PUN/LUN. The
> > INQUIRY is the only valid test allowed by the spec.
>
> The draft of SCSI-2 spec I have here hints that INQUIRY should be used
> to probe system configuration and that TEST_UNIT_READY is more for
> polling on devices with removable media. I tossed the TEST_UNIT_READY
> part out and INQUIRY alone works fine (one disk, 2 CDs and a tape on
> a BusLogic clone - all found as per usual).
I seem to remember the Bob Frey [formerly of Advansys and author of
that company's HBA drivers for several OSes] commenting that Linux
did something slightly different during initialization. Namely it
issued a TEST_UNIT_READY before an INQUIRY. I haven't checked if that
is still the case. Bob suggested that the Linux ordering was probably
incorrect (but seemingly harmless).
Doug Gilbert
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