why not support stm32f103

[ssmingyun1993]

why not support stm32f103?

[brghena]

There's no general reason why we couldn't support it. We do support the STM32F303 already. https://github.com/tock/tock/tree/master/chips/stm32f303xc

One concern: some specific STM32F103 chips have very little memory. I can't remember if we have an "official" policy on required RAM, but you'd certainly need to be in the top half of the table here: https://www.st.com/en/microcontrollers-microprocessors/stm32f103.html

Finally, to test with it, some board that uses the chip would be necessary. Did you have a board in mind that you're using?

Given support for other STM32F3 and F4 chips, I suspect this would be a relatively straightforward PR for a new Tock user. Some background on Porting Tock to new chips here: https://book.tockos.org/development/porting

[alevy]

@ssmingyun1993 basically, yes please! It is both possible (and supported) to have chip and board ports out of tree, and PRs for this repo (for chip and board ports) are welcome! As @brghena says, it should be reasonable to do for the cortex-m3 stm32's given the peripherals support that exists for the cortex-m4s, and there are plenty of chips in that range for which Tock could be appropriate (I'd say anything above the *8s or *Bs---so at least 64KB flash and 20KB SRAM).