Date: 03 Jul 2000 22:09:36 -0400 From: Nat Lanza <magus@cs.cmu.edu> To: Mike Smith <msmith@freebsd.org> Cc: scsi@freebsd.org, hackers@freebsd.org Subject: Re: SCSI HBA device detection? Message-ID: <uoc66qm4pen.fsf@hurlame.pdl.cs.cmu.edu> In-Reply-To: Mike Smith's message of "Mon, 03 Jul 2000 18:46:30 -0700" References: <200007040146.SAA00380@mass.osd.bsdi.com>
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Mike Smith <msmith@freebsd.org> writes: > If this is meant to be an exercise in writing a CAM HBA driver, then you > need to teach your disk-emulation code about the basic SCSI commands > (INQUIRY, TEST UNIT READY, etc). The SCSI infrastructure will use these > commands to automatically detect your drives. I already have code for handling the basic SCSI commands (I'm really porting a scsi-ramdisk driver from Linux rather than writing from scratch). The bit I'm curious about are which XPT actions I'll need to support other than XPT_PATH_INQ and XPT_SCSI_IO. > If you're writing a generic ramdisk, this is a really masochistic way to > go about doing it. 8) It's really a mix of an exercise in writing a CAM HBA driver and a first step towards a SCSI-over-IP driver. Also, a SCSI ramdisk can be handy for some of the benchmarking and tracing we do. --nat -- nat lanza --------------------- research programmer, parallel data lab, cmu scs magus@cs.cmu.edu -------------------------------- http://www.cs.cmu.edu/~magus/ there are no whole truths; all truths are half-truths -- alfred north whitehead To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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