Re: flash barebox to NAND

[Sascha Hauer <s.hauer@pengutronix.de>]

On Wed, Oct 23, 2019 at 03:47:49PM +0200, Mihaita Ivascu wrote:
> On Wed, Oct 23, 2019 at 3:33 PM Sascha Hauer <s.hauer@pengutronix.de> wrote:
> >
> > On Wed, Oct 23, 2019 at 11:39:00AM +0200, Mihaita Ivascu wrote:
> > > Hello all,
> > >
> > >   I would like to know what possibilities do I have to flash a barebox
> > > image to mtd partition from Linux?
> > >  Using ubifs commands does not work. the barebox will not boot so
> > > probably additional info needs to be written except the barebox image
> > > itself.
> >
> > On i.MX a bootloader image can't be written to Nand directly. In barebox
> > you can update barebox with the barebox_update command which has support
> > for the special image format requirements of the i.MX6. I currently
> > don't know any userspace code that can do this, apart from mfgtools or
> > other tools from the NXP universe that I have never used. Somebody told
> > me he wanted to port the i.MX6 barebox update code to userspace, but
> > unfortunately I can't remember who it was and I can't find any pointers
> > to it.
> >
> > Regards,
> >   Sascha
> >
> 
>    Thanks for your detailed answer.
>    so there is no way to update a barebox on NAND from Linux except
> from the barebox itself(using barebox_update command) ?
>    Yes I am trying with mfgtools but no success. NXP does not support
> barebox just u-boot and I was not successful on adding mfgtools/UTP
> support in barebox.
>    And using the u-boot konbs-ng command for flashing bootloader to
> NAND is faulty and the reason is documented in the NXP community.
>   Surely somebody from barebox community must have had the need before
> to update the barebox otherway than using barebox_update from the
> barebox itself.

One way to update barebox indirectly from Linux is to put the new
barebox image to some known place in the rootfs. Now in barebox
write a small script:

/env/init/bbu.sh:

#!/bin/sh

if [ -f /mnt/mmc0.0/boot/barebox-update.bin ]; then
	barebox_update -y /mnt/mmc0.0/boot/barebox-update.bin
	reset
fi

Then again under Linux delete that file when the running barebox version
(as read from the device tree or kernel commandline) matches the update
image.

Sascha

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