Re: Booting from usb hard disk

On Mon, Mar 30, 2009 at 06:03:33PM +0100, Paul B. Mahol wrote:
> On 3/30/09, Andrew Thompson <thompsa_at_freebsd.org> wrote:
> > On Mon, Mar 30, 2009 at 04:04:17PM +0100, Paul B. Mahol wrote:
> >> On 3/30/09, Andrew Thompson <thompsa_at_freebsd.org> wrote:
> >> > On Tue, Mar 24, 2009 at 03:49:32AM -0500, Robert Noland wrote:
> >> >> On Mon, 2009-03-23 at 19:40 -0300, Nenhum_de_Nos wrote:
> >> >> >
> >> >> > I had problem a while ago with via mini itx hardware, that was quite
> >> >> > close. If I try boot from usb (installed in usb hdd), I get to the
> >> >> > point
> >> >> > of loader not finding my disk.
> >> >> >
> >> >> > I then used a small flash disk attached to the ata (44 pin ide)
> >> >> > channel
> >> >> > and formatted /boot in there. this way I get to the point of mount
> >> >> > root
> >> >> > you said, and da0 not being alive soon enough to mount root. list
> >> >> > disks
> >> >> > also couldn't find da0 though.
> >> >> >
> >> >> > I tried current from that time, and no good.
> >> >> >
> >> >> > if this is solved, I'll be happy to try whatever patch to current.
> >> >> > (as
> >> >> > long as I can install it from another box/or its ata channel, as it
> >> >> > can't
> >> >> > boot vanilla 7.1R)
> >> >>
> >> >> So, my solution was to set kern.cam.scsi_delay=10000
> >> >> in /boot/loader.conf
> >> >
> >> > The following patch should work. It creates interleaving root hold
> >> > tokens from the CAM probe to disk_create and geom providor tasting.
> >> > I had to add a malloc type flag as sleeping isnt allowed at the point I
> >> > added the token alloc in CAM.
> >> >
> >> > http://people.freebsd.org/~thompsa/root_wait.diff
> >>
> >> Hmm, this is supposed to fix issue when trying to boot from usb disk
> >> with UP kernel?
> >
> > This is to address the issue where the usb disk hasnt been attached by
> > the time the root filesystem is mounted. ie, you are booting from usb.
> >
> > If your problem is different then please say.
> 
> On SMP booting from usb works (kern.cam.scsi_delay=2000), da0 will appear
> after user is asked to enter root mount point, and pressing ? will show
> ufs:da0s1a. On UP it doesnt work, ufs:da0s1a is not available.
> I thought it may be related to scsi_delay but increasing it was not
> solution.

Well the patch should (hopefully) fix this and you will no longer need
to set the scsi delay. Please test! :)


Andrew