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From: Hans Petter Selasky <hselasky@c2i.net>
To: freebsd-usb@freebsd.org,
 Stef Walter <stef@memberwebs.com>
Date: Thu, 1 Jul 2010 22:57:52 +0200
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Subject: Re: usb/138798: [boot] [usb8] 8.0-BETA4 can't boot from USB flash
	drive [regression]
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On Thursday 01 July 2010 22:30:08 Stef Walter wrote:
> The following reply was made to PR usb/138798; it has been noted by GNATS.
> 
> From: Stef Walter <stef@memberwebs.com>
> To: bug-followup@FreeBSD.org, sweetnavelorange@gmail.com
> Cc:
> Subject: Re: usb/138798: [boot] [usb8] 8.0-BETA4 can't boot from USB flash
>  drive [regression]
> Date: Thu, 01 Jul 2010 15:19:43 -0500
> 
>  Just to confirm, 8.1 still has this problem. Verified that 7.2 works.
> 
>  In my case the I'm booting off a USB stick. The system correctly waits
>  for 'usbbus4'. However the USB stick (da0) is not immediately available
>  once the 'usbbus4' is present. da0 becomes available immediately after
>  the kernel has tried to mount root. The kernel output from da0 is
>  intermingled with the 'ROOT MOUNT ERROR' output.
> 
>  I'm using:
> 
>  FreeBSD bsd8x.ws.local 8.1-RC1 FreeBSD 8.1-RC1 #3: Fri Jun 18 21:17:53
>  UTC 2010     root@bsd8x.ws.local:/usr/obj/usr/src/sys/RACKX  amd64
> 
>  Cheers,
> 
>  Stef

Hi,

There is a tunable

kern.cam.boot_delay: 0

Which I think you can set which solves this problem.

--HPS