Date: Fri, 31 Mar 1995 01:38:45 +0200 From: se@MI.Uni-Koeln.DE (Stefan Esser) To: Poul-Henning Kamp <phk@ref.tfs.com> Cc: CVS-commiters@freefall.cdrom.com, cvs-sys@freefall.cdrom.com Subject: Re: cvs commit: src/sys/i386/conf BOOTFLP Message-ID: <199503302338.AA24579@FileServ1.MI.Uni-Koeln.DE> In-Reply-To: Poul-Henning Kamp <phk@ref.tfs.com> "Re: cvs commit: src/sys/i386/conf BOOTFLP" (Mar 30, 11:12)
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On Mar 30, 11:12, Poul-Henning Kamp wrote: } Subject: Re: cvs commit: src/sys/i386/conf BOOTFLP } > Modified: sys/i386/conf BOOTFLP } > Log: } > Do not try to negotiate synchronous SCSI transfers in the Boot Kernel. } } How about controling this with the flags argument, and default it to off ? } } This way people can boot the boot.flp, but not from their harddisk... Yes. But then we know, there is something severely wrong with their system ... I put this change in, since there seems to be one series of Toshiba 3.5" disk drives, that has problems to negotiate synch. transfers. We had the NCR driver restricted to asynch. transfers in earlier GENERIC kernels, but found that most people don't ever enable synchronous transfers later. There is the "ncrcontrol" utility, that lets you set the max. synch. transfer rate and number of tags to use (with asynch. and NO tags being valid options) per target and LUN (or for all devices on the SCSI bus). We thought that it was best, if problems with cables or terminators, which are the most likely reasons for problems with FAST SCSI, showed up as early as possible, i.e. before remounting the root partition R/W. For this reason we considered switching on FAST SCSI from rc.local or some other startup file might be not so good an idea. But we could go back to asynch as the default in the GENERIC kernel, too ... Anyway. This makes a difference for the Toshiba MK537 and MK538 drives only, and there were 3 people upto now, that reported problems with them (BTW: these drives don't seem to work under BSD/OS, neither). Regards, STefan -- Stefan Esser Internet: <se@ZPR.Uni-Koeln.DE> Zentrum fuer Paralleles Rechnen Tel: +49 221 4706019 Universitaet zu Koeln FAX: +49 221 4705160 Weyertal 80 50931 Koeln
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