recipes-bsp/optee-ftpm: optee-ftpm package needs to be cross compiled

[rakeshk7097]

optee-ftpm builds successfully only in cross-compilation mode; therefore, setting the recipe to default to cross-compilation can resolve the following build error.

make[2]: Entering directory '/<>/Samples/ARM32-FirmwareTPM/optee_ta' /usr/bin/make -C fTPM CROSS_COMPILE=
make[3]: Entering directory '/<>/Samples/ARM32-FirmwareTPM/optee_ta/fTPM'
Checking symlink to the TPM folder: /<>
Checking symlink to the WolfSSL folder: /<>/external/wolfssl Establishing symlink.
Establishing symlink.
CC ../out/fTPM/platform/AdminPPI.o
CC ../out/fTPM/platform/Cancel.o
make[3]: *** No rule to make target 'lib/wolf/wolf_symlink/wolfcrypt/src/aes.c', needed by '../out/fTPM/./lib/wolf/wolf_symlink/wolfcrypt/src/aes.o'. Stop.
make[3]: *** Waiting for unfinished jobs....
CC ../out/fTPM/platform/Clock.o
CC ../out/fTPM/platform/Entropy.o
CC ../out/fTPM/platform/LocalityPlat.o
CC ../out/fTPM/platform/NvAdmin.o
CC ../out/fTPM/platform/NVMem.o
CC ../out/fTPM/platform/PowerPlat.o
CC ../out/fTPM/platform/PlatformData.o
CC ../out/fTPM/platform/PPPlat.o
CC ../out/fTPM/platform/RunCommand.o
CC ../out/fTPM/platform/Unique.o
CC ../out/fTPM/platform/EPS.o
CC ../out/fTPM/platform/PlatformACT.o
CC ../out/fTPM/reference/RuntimeSupport.o
CC ../out/fTPM/platform/fTPM_helpers.o
CC ../out/fTPM/fTPM.o
make[3]: Leaving directory '/<>/Samples/ARM32-FirmwareTPM/optee_ta/fTPM'
make[2]: *** [Makefile:6: all] Error 2

[rakeshk7097]

Hi @BaochengSu , could you please review the PR.

[jan-kiszka]

This rather looks like an issue that is independent of the recipe in meta-iot2050, rather shared by all that use optee-ftpm.inc from isar. But just dropping it there will also not solve the underlying issue because this would still break on arm64 build hosts - which we kind of supported once.

But why are you running into this at all? Are you actually building inside QEMU?

[rakeshk7097]

Hi @jan-kiszka ,
thanks for your comment.

This rather looks like an issue that is independent of the recipe in meta-iot2050, rather shared by all that use optee-ftpm.inc from isar. But just dropping it there will also not solve the underlying issue because this would still break on arm64 build hosts - which we kind of supported once.

But why are you running into this at all? Are you actually building inside QEMU?

Actually, I am building on an x86 host machine and attempted to build the optee-ftpm-iot2050 package without setting ISAR_CROSS_COMPILE = 1 in local.conf, but the build process reported an error.

Building only optee-ftpm package for cross-compilation might be beneficial rather than setting ISAR_CROSS_COMPILE = 1 in local.conf and compiling all packages in cross-compilation mode, as is the current practice with meta-iot2050 for enabling secure boot.

What would be your suggestion regarding this matter?