Add SMP support#205
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Also means we can collapse the mps3-an536-smp example back into mps3-an536, because we don't need special start-up routines any more (the presence of a custom `_default_start` before meant we weren't testing the supplied `_default_start` routine, so we had to split the example up).
You cannot check the stack contents of Core 1 on Core 0 when the MPU is enabled. So, now I set a flag and make sure not to do that for that particular test.
I copied from this example and got confused when it didn't work. Now it's fixed.
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Integrates SMP support into aarch32-rt. Now the default start-up routines (for Armv7-R, Armv7-A and Armv8-R) check MPIDR and do normal start-up on Core 0, and park any secondary core.
To get the secondary cores to work, you have to replace the park routine (
_asm_secondary_core_park) with one that waits for a reliable signal from Core 0 (like a hardware register, not definitely not a RAM location because RAM has random contents) and then returns. After that, stacks are initialised and the core ends up inkmain_secondary.This is a breaking change, but I think it makes SMP examples much easier to write. So much so, the
mps3-an536-smpexample folder has gone - they've been folded into the normalmps3-an536examples because they are now so similar.