Date: Wed, 2 Dec 1998 19:11:34 -0500 From: Randall Hopper <aa8vb@pagesz.net> To: Baety Wayne Amn 18CS/SCBD <Wayne.Baety@kadena.af.mil>, "'FreeBSD Current'" <freebsd-current@FreeBSD.ORG>, "'FreeBSD Questions'" <freebsd-questions@FreeBSD.ORG> Subject: Re: CAM Message-ID: <19981202191134.B868@pagesz.net> In-Reply-To: <06A98ECF2D0FD211AA240060B0681211F6CBAF@ms-18sptg1.kadena.af.mil>; from Baety Wayne Amn 18CS/SCBD on Mon, Nov 30, 1998 at 08:04:59PM %2B0900 References: <06A98ECF2D0FD211AA240060B0681211F6CBAF@ms-18sptg1.kadena.af.mil>
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Baety Wayne Amn 18CS/SCBD:
|Where's documentation on properly configuring a kernel for use with this new
|CAM SCSI subsystem. I have a Mylex DAC960PL (uses Symbios 53C720SE
|controller) and am wondering how to enable it in the kernel.
I asked for that a week or so ago, and didn't get any response. So I don't
know if there are any such docs. For example, CAM is in 3.0-RELEASE, and
there's really nothing on it in the handbook or FAQ. There is cam(3),
pass(4), and xpt(4), but that isn't really a how-to.
My limited understanding is that if you're running a CAM-enabled kernel,
CAM is just "there". My original pre-CAM SCSI-related kernel lines flew
with a CAM kernel with no change except "sd" disks are now "da" disks:
controller ncr0
controller scbus0 at ncr0 # Single bus device
disk cd0 at scbus0 target 0 unit 0 # SCSI CD-ROM
device sa0 at scbus0 target 4 unit 0 # SCSI tapes
disk da0 at scbus0 target 5 unit 0 # da0 = ZIP Drive
There's this new concept of a pass-through device (/dev/pass*) which I'm
not too sure about; these are doled out to detected SCSI devices. And
there's a TLI device (/dev/xpt*) which I think is allocated 1 per bus.
In addition to the above lines, I also added a wired-down pass0 so I
could configure SANE to find my scanner consistently. I also wired down my
CDRW, though I don't know if that's necessary or not:
device pass0 at scbus0 target 6 unit 0 # CAM passthrough = Scanner
device pass1 at scbus0 target 0 unit 0 # RICOH MP6200S CDRW
SCSI bus rescans and lists are much simpler with CAM (from a user's
perpective at least):
camcontrol rescan 0
camcontrol devlist
That's about all I know at this point.
Randall
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