2412405_en-US

[#1]

SWUpdate A/B OTA with U-Boot on i.MX8M Plus

Hi NXP Team,

I am implementing OTA on i.MX8M Plus LPDDR4 EVK using:

• Yocto Wrynose

• Linux 6.18.20

• U-Boot 2026.04

• SWUpdate 2026.05.1

Current Progress

• SWUpdate integrated successfully into Yocto.

• Successfully generated .swu packages.

• SWUpdate package installation is working.

• Hardware compatibility checking is working.

• Successfully updated /etc/ota-version using SWUpdate.

• rawfile handler is working.

• Now I want to implement production-level A/B OTA with automatic rollback and signed updates.

Questions

Could you please guide me on the recommended NXP approach for:

1. A/B rootfs partition layout.

2. U-Boot bootcount/bootlimit based rollback.

3. SWUpdate integration with U-Boot environment.

4. Correct fw_env.config / libubootenv configuration.

5. Signed .swu package verification.

6. Anti-rollback/version protection.

7. Secure Boot + SWUpdate integration.

Currently, the OTA update completes, but SWUpdate reports:

Cannot initialize environment from /etc/fw_env.config
Cannot persistently store update state

Is there an NXP reference design, application note, or example for SWUpdate + A/B + U-Boot rollback + signed OTA on i.MX8M Plus?

Thanks.

i.MX 8M | i.MX 8M Mini | i.MX 8M NanoYocto Project