[mips32] print dbg message via overridable dbgPanic routine
[mips32][pic32mx][serial] generic driver
[eic] support IRQ handler unregistration
[mips32][pic32mx][eic] replace sanity checks with asserts
[eic] remove source file as nothing special is done by HAL there
[mips32][pic32mx] export default PIC SFR layout
[mips32][qemu] define panic handler
[mips32][qemu] add missing stub routine
[mips32][pic32mx] PAL LLD
[mips32][pic32mx] SPI LLD
[mips32][PIC32-MAXI-WEB] MMC/SPI demo