Re: [RAUC] Inquiry About Initializing Both Slots with RAUC Without Reboot

["Jan Lübbe via RAUC" <rauc@pengutronix.de>]

Hi Ohara,

On Mon, 2025-11-17 at 02:52 +0000, 大原 匠汰 via RAUC wrote:
> Dear RAUC Development Team,
> I am currently working on a product that uses RAUC and involves a dual-slot
> (A/B) update setup. 
> During factory initialization, we would like to write an image to both slots
> without rebooting between operations.

Please note that in general factory bring-up is considered out-of-scope for
RAUC:https://rauc.readthedocs.io/en/latest/index.html#and-what-not:~:text=And%20finally%2C%20factory%20bring%20up%20of%20your%20device

> The system uses an eMMC with two slots for RAUC as follows:
>  * /dev/mmcblk0p1 → slot.A (on eMMC)
>  * /dev/mmcblk0p2 → slot.B (on eMMC)
> During the factory process, we Boot from an SD card that contains a separate
> partition for initialization:
>  * /dev/mmcblk1p1 → Factory initialization partition (on SD card)
> Currently, even when booting from the SD card, one of the eMMC slots (A or B)
> is still recognized as the active slot by RAUC.

That should not happen, but don't know enough details about your setup to
recommend anything specific. Please check:
https://rauc.readthedocs.io/en/latest/integration.html#booted-slot-detection
(specially the section on 'rauc.external')

> As a result, the factory image is only written to the inactive slot.
> Is there a way to configure RAUC to explicitly write to both slots (A and B)
> during the factory initialization process, without requiring a reboot between
> slot updates?

When you've told RAUC that none of your slots is active, you'll probably need
https://github.com/rauc/rauc/pull/1525 as well. This is part of the v1.15
release.

Regards,
Jan

> Thank you very much in advance for your support.
> Best regards,
>     Ohara

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