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chettrick / discobsd

2.11BSD-based Unix-like OS for STM32 and PIC32 Microcontrollers
http://www.DiscoBSD.org
BSD 3-Clause "New" or "Revised" License
182 stars 16 forks source link

FreeBSD require gcc-arm-embedded on STM32 (instead of arm-none-eabi-gcc) #10

Closed lhondareyte closed 1 year ago

lhondareyte commented 1 year ago

FreeBSD ports provide two ARM compilers:

The second one is for embedded devices like STM2 familly. His path is /usr/local/gcc-arm-embedded/bin

chettrick commented 1 year ago

I've set up a new FreeBSD 13.2 box to test using the gcc-arm-embedded port, but I haven't worked through all the issues yet. This should get in, at least to bring along FreeBSD as a host development OS in the future.

Please also add the same change for the compiler prefix for ARM_GCC_PREFIX in /sys/stm32/gcc-config.mk to this pull request.

Thanks again for your interest and help.

chettrick commented 1 year ago

I've been able to build base and kernel for stm32 with both compilers on FreeBSD 13.2.

Selecting which compiler to use on FreeBSD should be a personal choice, as I would prefer to not to use non-portable make features to determine which package is installed, especially when FreeBSD is not yet officially supported as a host development environment.

I am going to leave arm-none-eabi-gcc as the default on FreeBSD for now, and close this PR.

lhondareyte commented 1 year ago

I should have specified that the generated code does not work on the target. Only the compiler devel/gcc-arm-embedded works. (https://forums.freebsd.org/threads/arm-none-eabi-gcc-does-not-see-standard-libraries.80772/#post-516053) I had the same problem while compiling NuttX: compile is OK but fail to run on target.

chettrick commented 1 year ago

Thanks for the feedback @lhondareyte. I looked deeper into this (previously I only compiled it) and figured out the issue. The arm-none-eabi-gcc FreeBSD package does not enable multilibs and especially not the Cortex M/R profile that uses only Thumb-2 ARMv7e-m instructions supported by stm32f4 devices. The gcc-arm-embedded package does enable this, and makes proper stm32 kernels and base executables. I have tested a full base build and kernel build for the stm32f412g-disco board.

chettrick commented 1 year ago

@lhondareyte, I will merge this pull request as soon as you add the same change for the compiler prefix for ARM_GCC_PREFIX in /sys/stm32/gcc-config.mk. Then it's all good. Thanks again!

chettrick commented 1 year ago

Just for completeness of information, I worked through this compiler multilib profile issue with the devel/arm-none-eabi-gcc-linaro port on OpenBSD last September on commit b5e2d75707cd3938f9efbe7e8a9f3d3c2fccb218.

I wonder if anyone would like to put in the effort and see if a compiled port of devel/arm-none-eabi-gcc on FreeBSD with multilib enabled, similar to what I did in the above commit, would produce usable results. I may work on it if it is desired and needed.

Regards

chettrick commented 1 year ago

@lhondareyte, I will merge this pull request as soon as you add the same change for the compiler prefix for ARM_GCC_PREFIX in /sys/stm32/gcc-config.mk. Then it's all good. Thanks again!

I merged this PR, and also made a separate commit for the above specified change to /sys/stm32/gcc-config.mk.

FreeBSD should now be able to successfully compile stm32 kernels and the base system with the devel/gcc-arm-embedded package (albeit, with a few warnings raised due to the new GCC compiler version). Raise a new issue if that is not the case.

Regards.