tree a672fe63eb2e00a3675443598b43888dd1689102
parent 1e36c12aaece8968a37c90d2cdaf4fd3446615f5
author Joakim Bech <joakim.bech@linaro.org> 1680716887 +0200
committer Joakim Bech <joakim.bech@linaro.org> 1680771063 +0200

rpi3: don't strip kernel8.img

In one of the final build stages, buildroot will strip [1] binaries by
running the following on all binaries under ./out-br/target:

  $ aarch64-linux-gnu-strip --remove-section=.comment \
    --remove-section=.note

When doing that on kernel8.img (which should be a 1:1 copy of
./linux/arch/arm64/boot/Image), the expected "magic" from the kernel
header disappears and so does a few other things as well. In short, the
kernel image becomes corrupt. Without the magic, U-boot won't pass
execution to Linux and will instead fail with the error message: "Bad
Linux ARM64 Image magic!"

To prevent kernel8.img from being stripped, we include it in the
BR2_STRIP_EXCLUDE_FILES Makefile parameter.

Why this suddenly started to show, I haven't been able to figure out.

Link: [1] https://github.com/buildroot/buildroot/blob/71a2706320dbc22b16397b70b2d53b903bde0752/Makefile#L620-L650
Fixes: https://github.com/OP-TEE/optee_os/issues/5891

Signed-off-by: Joakim Bech <joakim.bech@linaro.org>
Tested-by: Joakim Bech <joakim.bech@linaro.org>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>