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>
diff --git a/rpi3.mk b/rpi3.mk
index 6fbbc9f..3b5e4ca 100644
--- a/rpi3.mk
+++ b/rpi3.mk
@@ -22,6 +22,10 @@
BR2_PACKAGE_OPENSSH_SERVER ?= y
BR2_PACKAGE_OPENSSH_KEY_UTILS ?= y
+# We don't want buildroot to strip kernel8.img, since that will remove the
+# "magic" from the kernel header.
+BR2_STRIP_EXCLUDE_FILES ?= kernel8.img
+
OPTEE_OS_PLATFORM = rpi3
include common.mk