rp2xxx: Add flash support on RP2350#934
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Previously,
hal.flashdidn't work on RP2350 as it tried to use the second stage bootloader for XIP setup which obviously wasn't available (this is only a RP2040 thing). Conveniently, on RP2350, the bootrom places a copy of the XIP setup function in boot ram that we can use instead.Tested on RP2350 (arm, arm_flashless and riscv). I haven't run any tests on RP2040.
PS: I have reverted some of my changes from #705. The reason for this is that stage2_rom didn't have any guaratee for being half word aligned and jumping to it is therefore unsafe. Aligning it is not that hard (but also not trivial as
@embedFiledoesn't allow you to specify alignment), but I noticed that pico sdk doesn't use the second stage bootloader in flashless images so maybe it is best to do as they do it. I can re-revert this if it is not wanted.PS_2: I might have discovered a bug in pico-sdk here. They set the thumb bit regardless of the architecture. It might not be a bug if on riscv PICO_NO_FLASH is expected to be set but idk.
Fixes #932