The errata sheet says M4_RST is not functional on LPC43x0. But I tried it on LPC4370 revisions C and D and it seems to work. Is the errata wrong, or is this function broken in some subtle way?
If M4_RST really can't be used, is there a way to simulate reset (for the purpose of a bootloader) without resetting GPIO configuration? I don't like the pulses that come out of the I/O pins when doing a hard reset.