Date: Wed, 22 Apr 2020 22:28:29 +0200 From: "Georg Lindenberg" <georg.lindenberg@web.de> To: freebsd-arm@freebsd.org Subject: Booting from USB on RPI3 Message-ID: <trinity-19081201-3024-4046-817a-48321c51a515-1587587309088@3c-app-webde-bap64> In-Reply-To: <20200421181224.GC96994@www.zefox.net> References: <mailman.61.1587470402.80084.freebsd-arm@freebsd.org> <trinity-4938b1d4-f29f-4907-bedd-65be21112e48-1587489497227@3c-app-webde-bs65> <20200421181224.GC96994@www.zefox.net>
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> Gesendet: Dienstag, 21. April 2020 um 20:12 Uhr
> Von: "bob prohaska" <fbsd@www.zefox.net>
> An: "Georg Lindenberg" <georg.lindenberg@web.de>
> Cc: freebsd-arm@freebsd.org, "bob prohaska" <fbsd@www.zefox.net>
> Betreff: Re: Booting from USB on RPI3
>
> On Tue, Apr 21, 2020 at 07:18:17PM +0200, Georg Lindenberg wrote:
> > Hey,
> > These are the steps I took to boot my RPI3B from usb.
> >
> > 1. Put the .img file on both the usb device and the SD Card (e.g. with=
dd).
> > 2. Plug in everything. RPI starts uboot from the SD Card.
> > 3. Type any key to enter the U-Boot prompt. Then type "run usb_boot".
> >
>
> That's a command I didn't know about, despite considerable looking.
> Is it described anywhere?
>
> It'll be my next experiment!
>
> > You can see all the uboot variables with "env print". Maybe it is poss=
ible to add "boot_cmd=3Drun usb_boot" to one of the config files, but I wa=
s too scared to try it.
>
> My Pi3's setup is experimental, so crashing/corrupting it isn't a proble=
m.
>
> Thanks very much for writing!
>
> bob prohaska
>
>
Uboot will run bootcmd, unless you hit a key. Then it will enter the shell=
.
You can track down bootcmd (env print bootcmd):
bootcmd=3Ddistro_bootcmd
distro_bootcmd=3Dfor target in ${boot_targets}; do run bootcmd_${target}
boot_targets=3Dmmc0 mmc1 usb0 pxe dhcp
So, in this loop, usb0 is in third place. :-/ mmc will boot first.
U-Boot> env print bootcmd_usb0
bootcmd_usb0=3Ddevnum=3D0; run usb_boot
Anyways, one way to tell uboot to boot the usb permanently would be sth li=
ke this:
setenv bootcmd=3Drun usb_boot
saveenv
However:
U-Boot> saveenv
Saving Environment to FAT... Failed (1)
This makes me wonder whether CONF_ENV_FAT_DEVICE_AND_PART is set correctly=
. It should be 0:1, or 0:auto, not 1:1.
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