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cveilleux / mender-espressobin

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Integrate atf-marvell to sign the u-boot binary #3

Open cveilleux opened 2 years ago

cveilleux commented 2 years ago

The layer will produce a u-boot.bin binary, but espressobin requires the bootloader to be signed/processed by atf-marvell in order to work.

https://github.com/MarvellEmbeddedProcessors/atf-marvell

Espressobin documentation on building:

http://wiki.espressobin.net/tiki-index.php?page=Build+From+Source+-+Bootloader

cveilleux commented 2 years ago

It seems that arm-trusted-firmware is already supported by meta-espressobin which we are based on.

https://github.com/teamredlabs/meta-espressobin/tree/dunfell/recipes-bsp/arm-trusted-firmware

The flashable flash-image.bin is not automatically built when compiling an image. I will need to look-into why, but it can be built by calling it directly:

bitbake arm-trusted-firmware

This will produce the required flash-image-espressobin-vX.bin under tmp/deploy/images/MACHINE

Warning, this binary contains the cpu clock and ram clock configuration. The timings are defined under ATF_CLOCKSPRESET here:

https://github.com/teamredlabs/meta-espressobin/tree/dunfell/conf/machine/include

There are many different boards floating around, depending on production date. The defaults seem to be the most common ones.

Once tested, full instructions to flash u-boot should be added to the README