raspberrypi
Add support for using XIP cache as SRAM
Draft for now, as it includes changes from https://github.com/raspberrypi/pico-sdk/pull/2645 and https://github.com/raspberrypi/pico-sdk/pull/2137, requires the xip-sram branch of picotool (otherwise UF2 creation and signing fails), and is still WIP - just raising so it can be viewed early, and maybe some of these bits can be added to https://github.com/raspberrypi/pico-sdk/pull/2137
This should fix https://github.com/raspberrypi/pico-sdk/issues/2653 for both RP2040 and RP2350
This adds new binary types xip_sram (whole binary in XIP SRAM), and copy_to_ram_using_xip_ram/no_flash_using_xip_ram (time critical functions placed in XIP SRAM)
Also adds parsing of addressmap.h so variables in it can be accessed by using pico_get_addressmap_value, to remove hardcoded SRAM addresses from the CMake
These changes are now working as expected for me and my test program running on an RP2040 using in following configurations:
pico_set_binary_type(main copy_to_ram_using_xip_ram)
pico_set_binary_type(main copy_to_ram)
pico_set_binary_type(main no_flash_using_xip_ram)
pico_set_binary_type(main no_flash)
