Description

Right now, the FLASH length in memmap_mp_rp2040.ld and memmap_mp_rp2350.ld are hard-coded to the flash size of the Pico (2MB) and Pico 2 (4MB) respectively.

However, there are a number of RP2 boards the have different amounts of flash. For example, all of our (SparkFun) RP2 boards have 16MB of flash. This feature request is to enable a method for the flash size in the linker script to be configurable, ideally matching whatever is set by PICO_FLASH_SIZE_BYTES.

While these hard-coded values are fine for base MicroPython, we're working on a project (can't say what 🤫) that results in the firmware being over 2MB, possibly even over 4MB. This results in the linker failing because the firmware size exceeds the hard-coded flash length values:

firmware.elf section `.text' will not fit in region `FLASH'`
region `FLASH' overflowed by xxxx bytes

Code Size

This should have no effect on the code size, other than enabling larger projects to actually fit into boards with larger flash chips. And this will ensure the flash size matches what is actually on each board.

I believe it should be trivial to define a symbol for the linker script, similar to __micropy_c_heap_size__ for example:

Implementation

I intend to implement this feature and would submit a Pull Request if desirable

Code of Conduct

Yes, I agree