[issue1463] Mountroot before drives are initialized

[Eric J. Christeson (via DragonFly issue tracker)]

Eric J. Christeson <eric.j.christeson at gmail.com> added the comment:

I am also running into this problem on a Dell Optiplex GX270 (P4 2.26Ghz)  I
have a SCSI drive as my boot/root drive and IDE drive and CD.

I've been tracking HEAD and first noticed the problems after the devfs changes.
 At the time I was going a few days between rebuilds so I can't easily pinpoint
the time.

I noticed a few interesting things:

1. booting in verbose mode does NOT result in a mountroot failure
2. at the mountroot prompt, ? doesn't list da0 (root device) the first time, but
will list it subsequent times.
3. at mountroot, specifying root doesn't work as the first typing.  If I type ?
first, or try specifying root twice, it works.
4. Booting with or without a CD in the CD-ROM drive gives the same results

I've got a couple of hours, so I may try to look at this.

Included files:
dmesg.fine.out  Verbose boot, no mountroot hang
dmesg.hang      Standard boot, note failure after first time specifying rootdev,
strange cd0: message after ?  and finding root after specifying rootdev again.

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status: unread -> chatting

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<http://bugs.dragonflybsd.org/issue1463>
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