Port to STM32

[per42]

Augment flash controllers with their instance on STM32.

This works on current zephyr main - e92677bd3cceb27079d7cb1e3f783d809edea362. It runs the hello world sample on nucleo_wl55jc, but fails with:

panic: panicked at library/alloc/src/alloc.rs:437:13:
memory allocation of 8 bytes failed
*** Booting Zephyr OS build v4.1.0-4886-ge92677bd3cce ***
[00:00:00.000,000] <err> os: CONFIG_COMMON_LIBC_MALLOC_ARENA_SIZE is 0
[00:00:00.008,000] <err> os: r0/a1:  0x00000004  r1/a2:  0x0000000a  r2/a3:  0x00000000
[00:00:00.008,000] <err> os: r3/a4:  0x00000004 r12/ip:  0x200022f4 r14/lr:  0x08007f5b
[00:00:00.008,000] <err> os:  xpsr:  0x21000000
[00:00:00.008,000] <err> os: Faulting instruction address (r15/pc): 0x08004e48
[00:00:00.008,000] <err> os: >>> ZEPHYR FATAL ERROR 4: Kernel panic on CPU 0
[00:00:00.008,000] <err> os: Current thread: 0x200005e8 (unknown)
[00:00:00.025,000] <err> os: Halting system

This is easily solved with CONFIG_COMMON_LIBC_MALLOC_ARENA_SIZE=4096 in prj.conf. I can add this to this pull request or separately if you prefer, but I don't know what is suitable for all samples and tests.

[00:00:00.000,000] <inf> rust: rustapp: Hello world from Rust on nucleo_wl55jc

I also tried to add this on main, but DTS parsing fails due to the parser not accepting the origin comments produced by zephyr, it seems. I assume you would like this change introduced there, and then backported.

[d3zd3z]

Let's keep the malloc arena size change separate. If anything, we might need to figure out how to make this specific to this target. I'm not actually sure why it is needed there, the default for the arena size should be -1, which uses the rest of RAM for the heap.

[d3zd3z]

Looks good. I'll probably clean up the first line of the commit text to make it a little clearer, but the change itself looks good.

[d3zd3z]

Also, this should be on main, not on the 4.1 branch.

[d3zd3z]

It will also need a Signed-off-by from @per42.

[d3zd3z]

@per42, I've created @109 which is this change, based instead on 'main'.

[per42]

Also, this should be on main, not on the 4.1 branch.

Yes, #109 on master (probably since commit 1cab77b436bccf2c84678e8825b586a093da0918 ) builds and runs the sample on my board. Closed.