Date: Sat, 15 Feb 2003 12:20:46 +0100 From: Thomas Quinot <thomas@FreeBSD.ORG> To: "Kenneth D. Merry" <ken@kdm.org> Cc: scsi@FreeBSD.org, current@FreeBSD.org, joe@FreeBSD.org, thomas@FreeBSD.org Subject: Re: call for testers: cd(4) changes Message-ID: <20030215112046.GA20707@melusine.cuivre.fr.eu.org> In-Reply-To: <20030214232001.A71462@panzer.kdm.org> References: <20030214232001.A71462@panzer.kdm.org>
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Le 2003-02-15, Kenneth D. Merry écrivait :
> - Automatically detect CDROM drives that can't handle 6 byte mode
> sense and mode select, and adjust our command size accordingly.
> More information on that below.
>
> - MODE_SENSE and MODE_SELECT translation removed in ATAPICAM and in
> the umass(4) driver, since there's no way for that to work properly
> (see below).
I'm afraid things are not as simple as that. Unfortunately you cannot
expect ATAPI drives to properly reject MODE_{SENSE,SELECT}_6 and try the
_10 variants in that case: the reason why ATAPICAM inconditionnally
translates the _6 commands into _10 is because some ATAPI drives have
been found to lock up when they rececive the _6 commands, whereas the
ATAPI specification only mandates the implementation of the _10
versions.
> - The media validation routine also reads the table of contents off
> the drive.
Great! That could also allow the creation of per-track /dev nodes, as
acd has.
Thomas.
--
Thomas.Quinot@Cuivre.FR.EU.ORG
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