Add rp2040 ram image (flashless) target board #535
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Grazfather
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This tries to implement #491.
Basically:
.dataand clearing.bssVTORto point to the vector table in sramThis counts on the behaviour of the bootloader, which, after loading a uf2 will jump to the lowest address it loaded, where I place the stub that sets VTOR and jumps to the entry point.
Note that because of a bug (ziglang/zig#23869), if you're building this target, you should do a clean build to properly pick up updates.