Re: [linux-usb-devel] Re: /dev/sr0 not ready, but working

From: Jeff Garzik (jgarzik_at_pobox.com)
Date: 11/22/05

  • Next message: Adrian Bunk: "[RFC: 2.6 patch] let MAGIC_SYSRQ no longer depend on DEBUG_KERNEL" 
    Date:	Tue, 22 Nov 2005 14:00:05 -0500
To: Alan Stern <stern@rowland.harvard.edu>

    On Tue, Nov 22, 2005 at 01:56:39PM -0500, Alan Stern wrote:
    > I know practically nothing about how your device works, so this is just a
    > guess. It seems likely that the IEEE1394-USB/ATA interface controller
    > translates the commands it receives over the external bus into a sequence
    > of ATA or ATAPI commands that is somewhat different from the sequence of
    > commands Linux would use if the drive were directly attached to an IDE
    > controller. As a result, perhaps the drive sends those "not ready"
    > replies when you use it over an external bus but not when you use attach
    > it over ATA.
    >
    > Or maybe not... Maybe the drive _does_ send those "not ready" messages
    > and the IDE driver ignores them instead of printing them in the system
    > log. Or perhaps those messages are sent by the bus interface controller
    > and not by the drive itself. I just don't know.

    The difference is between ide-cd.c and sr.c, most likely.

            Jeff

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