Re: [RAUC] Non reduntant bootloader update

["Jan Lübbe" <jlu@pengutronix.de>]

Hi,

On Tue, 2023-01-03 at 09:31 +0100, Ahmad Fatoum wrote:
> Hello Bernd,
> 
> On 03.01.23 09:17, BAUER Bernd wrote:
> > Hi!
> > 
> > I have an IMX8MN system and want to use RAUC to update the bootloader.
> > The BL is on the EMMC (no partition) and is not redundant.
> 
> Why would you not place it into the dedicated hardware boot partitions
> that your eMMC already has?
> 
> > Does this work with Rauc at all?
> 
> eMMC boot partition are better because they provide power-fail safe update,
> but you could use the eMMC user area with RAUC as well.
> Easiest way is to just place a MBR/GPT partition at the location where the
> bootrom expects the bootloader. There's no rule that the bootloader needs
> to be located in unpartitioned space.

Which SoC are you using?

Depending on what the ROM code expects, you could use the other types (boot-raw-
fallback or boot-mbr-switch).

If the ROM code only supports a single fixed bootloader offset, you cannot
update it atomically. Support for that is not implemented in RAUC yet.

> > I have unfortunately found nothing in the manual about it.
> 
> There's: https://rauc.readthedocs.io/en/latest/examples.html#atomic-bootloader-updates-emmc

More details on the available methods are in:
https://rauc.readthedocs.io/en/latest/advanced.html#updating-the-bootloader

Regards,
Jan


-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |