How to change the FLASH size in the linker script?

[romainreignier]

Hi,

I have a program for the ch32v003 but the linker step fail because it uses too much space on FLASH:

error: linking with `rust-lld` failed: exit status: 1
[...]
= note: rust-lld: error: section '.rodata' will not fit in region 'FLASH': overflowed by 2472 bytes

I would like to temporarily increase the FLASH section in the linker script in order to have my binary built, I will then be able to investigate what part is taking too much space with cargo-bloat.
I know that such binary will not work on the real target.

I would like to provide a custom memory.x file with a bigger size. But how to override the build flags in build.rs in order to use my local version?

Because all the ch32v003 variants have the same memory, I cannot switch my feature flag to another variant. Changing the family changes the qingke model to another version and the implementation is different (delay for example).

[andelf]

Refer: https://github.com/ch32-rs/ch32-hal/blob/main/examples/ch32v203/build.rs

[romainreignier]

Great, thank you, it works!