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From: kls30@duts.ccc.amdahl.com (Kent L Shephard)
Newsgroups: comp.sys.next
Subject: Re: How to boot by default fom an external disk.
Message-ID: <00b102U507PG01@JUTS.ccc.amdahl.com>
Date: 22 Apr 91 15:59:15 GMT
References: <FELIX.91Apr20165256@cayucos.ai.sri.com>
Sender: netnews@ccc.amdahl.com
Reply-To: kls30@DUTS.ccc.amdahl.com (Kent L. Shephard)
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Organization: Amdahl Corporation, Sunnyvale CA
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In article <FELIX.91Apr20165256@cayucos.ai.sri.com> felix@ai.sri.com (Francois Felix INGRAND) writes:
>
>We just built an external bootable disk for our NeXT Station, and we would like
>to boot on it by default.
>
>the command to boot on it is:
>b sd(1,0,0)sdmach rootdev=/dev/sd1a
>
>(if we do not specify the rootdev argument, it boots on /dev/sd1a but switch to
>/dev/sd0a as root partition)
>
>As a result this command is too long (>12 characters) and cannot be given as
>the default boot command in the Console monitor.
>
>Is there any way (without rebuilding the kernel) to specify that the rootdev is
>now /dev/sd1a? (so we could avoid the rootdev argument and therefore use a
>shorter command)
>
>If this is not possible, how can we change the scsi number of the internal
>disk?... My guess is that if we give it a higher number than the external one,
>them their names will swap (sd1a sd0a)...
>

All internal drives in NeXT machines should be shipped with the internal
at SCSI address #1  what you need to do is changet your external device to
SCSI address #0.  It should then boot from the external by just giving
the command bsd.

Device numbers (/dev/sdxx) are assigned to SCSI devices by starting with
the lowest SCSI # and naming it /dev/sd0a the next would be /dev/sd1a.
The device number does not equal SCSI #.

>Thanks in advance,

Hope this helps.

>--
>-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
>Francois Felix INGRAND                          SRI International, AIC
>felix@AI.SRI.COM                                333, Ravenswood Avenue
>(415) 859-5584                                  MENLO PARK, CA 94025, USA
>"Read my Lisp... No new syntax" (nil)

           KeNT - A satified user.  I would be more satisfied when someone
                  writes a sequencer so I can dump my PC.
--
/*  -The opinions expressed are my own, not my employers.    */
/*      For I can only express my own opinions.              */
/*                                                           */
/*   Kent L. Shephard  : email - kls30@DUTS.ccc.amdahl.com   */