core 1 launch FIFO sequence is not documented

[debuti]

I arrived at

pico-sdk/src/rp2_common/pico_multicore/multicore.c

Line 130 in afc10f3

uint32_t cmd_sequence[] = {0, 0, 1, (uintptr_t) vector_table, (uintptr_t) sp, (uintptr_t) entry};

I miss here a link to the document where this command sequence is stated

[lurch]

That might be the "launch protocol" referred to on page 156 of the RP2040 datasheet? So you might need to look at the bootrom sourcecode for more information? 🤷‍♂️

[debuti]

I did, and I found some routines in an assembly file. But Id like some solid docs so that I can port this to a Rust lib.

Thanks for the hint though

[kilograham]

yes this is currently not documented, though as you say it would be useful to be... that said, if you re-implement what the C source does, then you are in good shape (namely that if core 1 is just coming out of reset - and you may want to if it was doing something else)... you will not suffer a race condition with the startup of core 1

[kilograham]

p.s. that is the only meaningful sequence

[kilograham]

fixed in upcoming doc release for SDK1.3.0