Booting from USB on RPI3

[bob prohaska]

Hi Georg,

Thank you for revealing some fine points of u-boot.
I'd have given up without your help!

bob prohaska

On Wed, Apr 22, 2020 at 10:28:29PM +0200, Georg Lindenberg wrote:
> > Gesendet: Dienstag, 21. April 2020 um 20:12 Uhr
> > Von: "bob prohaska" <fbsd at www.zefox.net>
> > An: "Georg Lindenberg" <georg.lindenberg at web.de>
> > Cc: freebsd-arm at freebsd.org, "bob prohaska" <fbsd at 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 possible to add "boot_cmd=run usb_boot" to one of the config files, but I was too scared to try it.
> >
> > My Pi3's setup is experimental, so crashing/corrupting it isn't a problem.
> >
> > 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=distro_bootcmd
> distro_bootcmd=for target in ${boot_targets}; do run bootcmd_${target}
> boot_targets=mmc0 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=devnum=0; run usb_boot
> 
> Anyways, one way to tell uboot to boot the usb permanently would be sth like this:
> setenv bootcmd=run 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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