Date: Mon, 24 Mar 2003 11:30:08 -0800 (PST) From: Alan Barrett <apb@cequrux.com> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/36610: acd0: MODE_SENSE_BIG command timeout - resetting Message-ID: <200303241930.h2OJU8uG080180@freefall.freebsd.org>
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The following reply was made to PR kern/36610; it has been noted by GNATS. From: Alan Barrett <apb@cequrux.com> To: freebsd-gnats-submit@FreeBSD.org, pblok@inter.NL.net Cc: Subject: Re: kern/36610: acd0: MODE_SENSE_BIG command timeout - resetting Date: Mon, 24 Mar 2003 21:20:43 +0200 This problem still exists in FreeBSD-4.7-RELEASEp7, and was also present in FreeBSD-4.6-RELEASE, but was not present in FreeBSD-4.5-RELEASE. Here's what a FreeBSD-4.5 kernel says: acd0: CDROM <SONY CD-ROM CDU523 1> at ata1-master using PIO4 Here's what a FreeBSD-4.7-RELEASEp7 kernel says: acd0: MODE_SENSE_BIG command timeout - resetting ata1: resetting devices .. done acd0: MODE_SENSE_BIG command timeout - resetting ata1: resetting devices .. done [repeats several times, eventually followed by a reboot] FreeBSD-4.6.2 behaved excatly like FreeBSD-4.7. I have not tried FreeBSD-current with this hardware. For comparison, here's what a NetBSD-current (NetBSD-1.6Q) kernel says: cd0 at atapibus0 drive 0: <SONY CD-ROM CDU523 1, , Ver 52B> cdrom removable cd0: drive supports PIO mode 4, DMS mode 2, Ultrea-DMS mode 4 9Ultra/66) I don't know for sure, but I suspect that some CD-ROM devices do not support the ATAPI MODE_SENSE_BIG command, and that some operating systems manage to treat this failure as non-fatal. --apb (Alan Barrett) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the messagehelp
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