Date: Fri, 02 Oct 1998 00:44:10 +0800 From: Peter Wemm <peter@netplex.com.au> To: Terry Lambert <tlambert@primenet.com> Cc: karl@Denninger.Net (Karl Denninger), tom@uniserve.com, dnelson@emsphone.com, bright@hotjobs.com, current@FreeBSD.ORG Subject: Re: Long IDE probes? Message-ID: <199810011644.AAA19202@spinner.netplex.com.au> In-Reply-To: Your message of "Thu, 01 Oct 1998 02:19:53 GMT." <199810010219.TAA20771@usr01.primenet.com>
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Terry Lambert wrote: > > Are the delay lengths reasonable? I don't know. Aren't there specs on > > this stuff from the IDE and SCSI camps? > > > A better question: is there *ANYONE* out there that has a bootable > IDE or SCSI device that FreeBSD detects, but which the BIOS POST > display does not show as being present in the machine? Yep, this one isn't detected after a power-off, but does get detected by the bios with a hard reset (no need to wait for spinup). da1 at ahc0 bus 1 target 0 lun 0 da1: <SEAGATE ST41600N 0090> Fixed Direct Access SCSI2 device da1: 5.0MB/s transfers (5.0MHz, offset 15), Tagged Queueing Enabled da1: 1307MB (2676846 512 byte sectors: 64H 32S/T 1307C) This is a full-height 1.3G drive. It almost looks like it doesn't respond to commands until the disk has spun up (which takes a long time, it's got 9 heavy platters inside (18 heads)). It sees the 3.5 inch boot drive though. If I swap the drives so the seagate is id 0 on bus 0, the adapter will wait quite some time for the 5.25 inch disk to get going. > Is there *ANYONE* out there that needs "settle" time for their > BIOS-less adapters, and requires that all adapters eat this > overhead, if if their adapter isn't detected? I'm not sure I follow the question.. If I set SCSI_DELAY real low (eg: 1 second, from memory), the FreeBSD probe misses an old CDROM and sometimes a DAT tape drive. This happens regardless of whether the bios is enabled. I boot that machine from IDE disks. > Terry Lambert > terry@lambert.org Cheers, -Peter To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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