Add support for FreeRTOS

[gtxzsxxk]

Recently I have added a package which will download and compile the modified version of FreeRTOS released by the official duo-buildroot-sdk. I fix some gcc compatible problems when compiling with buildroot toolchains. Now when we say Y to this package, we could directly treat the output/build/milkv-duo-smallcore-freertos-hash as our project directory. We can add our code and the buildroot will automatically compile and pack this into the fip.bin and sdcard.img, loading the FreeRTOS into the small-core.

Do you have any ideas on that?

[shodan8192]

Haven't looked it yet, if something come to mind, I'll let you know.

[gtxzsxxk]

OK. Thanks!

[shodan8192]

Approach with output/build/milkv-duo-smallcore-freertos-hash/cvitek/task/comm/src/riscv64/ as project directory has some downsides :

• hash name part is variable, will change between commits
• it's burried deep inside output folder
• we have to make whole buildroot at least once
• it is volatile, make clean all will vanish our code from there

Maybe FreeRTOS package can be patched here :
https://github.com/gtxzsxxk/milkv-duo-smallcore-freertos/blob/fb1fb0f6061a8a3397adaa90b5c1546527156313/cvitek/task/CMakeLists.txt#L23
to point some other directory, eg inside board/milkv/duo ?

[gtxzsxxk]

Thank you for your review~ OK, let me explain them.

hash name part is variable, will change between commits

Sure. So I have to try keeping the github repo unchanged.

it's burried deep inside output folder
it is volatile, make clean all will vanish our code from there

That's right. I am looking for better solutions as well.

we have to make whole buildroot at least once

We could use make milkv-duo-smallcore-freertos-rebuild to simply rebuilt our freertos. And if we do not have much changes, when make the buildroot, it will just simply do some pack things very quickly.

[gtxzsxxk]

And it seems that there are no more better way to write code for the freertos. If you are using the official sdk, you have to make the whole project too.

[shodan8192]

You are right of all about this. So it is not possible to change directory path that's holds user code to something more convenient ?

[gtxzsxxk]

Maybe possible. Maybe we can try add a prompt in the buildroot, asking the user to provide their code. When we make the whole buildroot or rebuild the freertos package, the mk script will copy the user's code and then compile. This is just my imagination. It seems possible but I don't know if it is practical. Maybe I can give it a try after I survive my midterm exam.

[shodan8192]

OK, good luck with the exam then !

[gtxzsxxk]

haha, thanks for your help and ideas too!