Re: Booting from usb hard disk

On 3/30/09, Andrew Thompson <thompsa@xxxxxxxxxxx> wrote:
On Mon, Mar 30, 2009 at 06:03:33PM +0100, Paul B. Mahol wrote:
On 3/30/09, Andrew Thompson <thompsa@xxxxxxxxxxx> wrote:
On Mon, Mar 30, 2009 at 04:04:17PM +0100, Paul B. Mahol wrote:
On 3/30/09, Andrew Thompson <thompsa@xxxxxxxxxxx> 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! :)

With 2000 it works for both UP & SMP but setting scsi_delay to 50000 caused
text to scroll forever, waiting for CAM.

Could scsi_delay get removed?

--
Paul
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