Date: Fri, 16 Aug 2002 15:39:01 -0700 (PDT) From: Nate Lawson <nate@root.org> To: scsi@freebsd.org, current@freebsd.org Subject: Proliferating quirk table entries Message-ID: <Pine.BSF.4.21.0208161526550.43909-100000@root.org>
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I'm working on cleaning up quirk entries in scsi_da.c, especially ones related to READ/WRITE 6->10 escalation. For those just joining in, there is a function (cmd6workaround) that handles a R/W6 error by translating the cdb to 10 bytes and restarting it. It also increases the command size that will be used to 10 so future R/W requests automatically work. This is obviously preferable to entering quirk entries for every USB device. This function has been tested for a while but it's still possible some equipment won't correctly handle the workaround. I am preparing to add a kernel option (DISABLE_CDB6_QUIRKS) that will default to off. It will disable the use of DA_Q_NO_6_BYTE to allow cmd6workaround to do its stuff. Users of equipment listed in the quirk table would be solicited to enable this kernel option and try their equipment again. If problems are found in the workaround code, I will attempt to fix them. If things work, that quirk can be removed. If you have alternative suggestions, let me know. NO_SYNC_CACHE will be next on my list. -Nate To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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