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armstubs: Add wfe to ARMv7/ARMv8-32 stubs #76

Closed pelwell closed 7 years ago

pelwell commented 7 years ago

[ N.B. Don't merge this without first ensuring the kernel-side patch has propagated far enough, ideally upstream. ]

This patch causes secondary CPUs to enter a low power state while waiting to be woken during booting. Without the corresponding kernel patch to send an event, the secondary CPUs won't come online.

See: https://github.com/raspberrypi/linux/issues/1989

Signed-off-by: Phil Elwell phil@raspberrypi.org