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Date:      Wed, 10 Jun 2015 17:53:23 -0600
From:      Ian Lepore <ian@freebsd.org>
To:        bob prohaska <fbsd@www.zefox.net>
Cc:        freebsd-arm@freebsd.org
Subject:   Re: Booting a USB hard drive
Message-ID:  <1433980403.1200.381.camel@freebsd.org>
In-Reply-To: <20150610231238.GA29525@www.zefox.net>
References:  <20150610231238.GA29525@www.zefox.net>

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On Wed, 2015-06-10 at 16:12 -0700, bob prohaska wrote:
> Are there any descriptions floating around for booting an
> rpi2 from a usb hard disk? I thought it would be a simple
> matter of loading a crochet image on both microSD card and
> hard disk, then adjusting the boot config on the microSD card
> to point at the hard disk.
> 
> In fact it does work, but only by stalling the boot process
> at the mountroot prompt long enough for the hard disk to
> be (re) discovered, whence issuing the ufs:da0s2a command
> results in a clean boot of the hard disk, with the microSD
> card left unmounted.  
> 
> Apologies if this is a premature request; there are many
> discriptions of how to boot Raspbian from USB, but I could
> not find any guidance on how to do it with FreeBSD. The 
> small success thus far seems to have been a matter of luck. 
> 
> Thanks for reading, and any guidance.
> 
> bob prohaska
> 
> 
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Copy /boot/loader.rc.sample to /boot/loader.rc, then add

   kern.cam.boot_delay="10000"

to /boot/loader.conf (you may have to create the file).  That's a
10-second delay for the usb drive to be ready, adjust as necessary with
a delay in milliseconds.

-- Ian




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