Date: Fri, 6 Apr 2001 03:27:07 -0500 From: Mike Meyer <mwm@mired.org> To: Glenn Johnson <glennpj@charter.net> Cc: questions@freebsd.org Subject: Re: NEC IDE CD writer not working with burncd Message-ID: <15053.32219.89885.239143@guru.mired.org> In-Reply-To: <75866052@toto.iv>
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Glenn Johnson <glennpj@charter.net> types: > On Thu, Apr 05, 2001 at 01:11:43PM +0100, Aleksandar Simic' wrote: > > Some IDE CDR aren't supported because they use proprietary IDE > > additions. I've learned that the same, hard way as you. > No one has been able to answer my question about this. Why is it that > these proprietary IDE additions that you refer to do not cause Linux to > trip? I know that Linux uses ide-scsi emulation and FreeBSD does not, > but shouldn't these proprietary IDE additions cause the ide-scsi module > loading to fail under Linux? Because the scsi-ide module doesn't care about the commands understood by the drive; it just arranges things so that applications can send SCSI commands that end up at IDE drives. The application in question - cdrecord - has to deal with the quirks of all the drives. It started doing this with SCSI drives before the standard for CDRW commands existed, so it does a pretty good job of it. Handling IDE drives once the kernel provides scsi-ide mapping is straightforward. In some cases it's even free, as the manufacturer uses the same command logic with a different bus interface. On the other hand, this is *not* something you want in the kernel. In fact, the stated policy for cd burners on FreeBSD is that FreeBSD supports cdrecord, which is a third party application. Both hooking ATA up to CAM - which would hook cdrecord up to ide devices - and making burncd work on the SCSI drives that follow the mmc standard have been discussed, but neither has happened. <mike -- Mike Meyer <mwm@mired.org> http://www.mired.org/home/mwm/ Independent WWW/Perforce/FreeBSD/Unix consultant, email for more information. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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