Date: Fri, 24 Apr 2020 17:17:43 -0700 From: bob prohaska <fbsd@www.zefox.net> To: Mark Millard <marklmi@yahoo.com> Cc: freebsd-arm <freebsd-arm@freebsd.org>, bob prohaska <fbsd@www.zefox.net> Subject: Re: Booting from USB on RPI3 Message-ID: <20200425001743.GA7044@www.zefox.net> In-Reply-To: <5FA69E16-72DE-4175-A0FB-BEFA1A865633@yahoo.com> References: <8D1F6A8D-4910-4C1E-8EB5-2F5F89E31120@yahoo.com> <CAJuc1zOTnoRmeaKXHMTH9po=6ipBYDxvxAoiVmow-sNgwUERVQ@mail.gmail.com> <20200423212614.GA3996@www.zefox.net> <328B7083-1119-43F1-A6E4-61F1FB9E922E@yahoo.com> <20200423233259.GD3996@www.zefox.net> <74DB7BC9-8F60-404B-BF7B-02B06D5A1011@yahoo.com> <20200424021808.GA4638@www.zefox.net> <F0C464CD-2E1A-487C-97D3-D79C7A197132@yahoo.com> <20200424195953.GA6707@www.zefox.net> <5FA69E16-72DE-4175-A0FB-BEFA1A865633@yahoo.com>
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On Fri, Apr 24, 2020 at 03:09:35PM -0700, Mark Millard wrote: [huge snip, hope nothing vital was lost] > > Now that using both the microsd card and USB drive > as a pair to boot has been shown to work, have you > made the USB drive match what is used on from > the microsd card (such as the msdos file system) > and checked what the USB drive does without > involving the microsd card? > > (Although, I wonder if the "10 sec" issue ends up > involved, possibly blocking this way of working.) No. If there's no microSD at all the Pi3B is simply inert on power-up. No rainbow screen, no serial console, nothing. The OTP boot-from-usb bit is set according to Raspbian, so mine is one of the Pi3's that requires a microSD card. If there's no microSD filesystem to fall back to, maybe u-boot would keep trying until the USB hard drive woke up. Somebody also mentioned recompiling u-boot with a longer timeout, not an unreasonable step. For now I'll declare victory and retreat 8-) I gather the Raspberry Pi Foundation didn't more widely publicise the boot-from-usb feature because it didn't work with a too-large fraction of USB storage devices. Having now seen the exercise in person, I understand their motives. There was absolutely no chance of success without the vast amount of help I got on this list. With my thanks, bob prohaska
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