armstubs: Add wfe to ARMv7/ARMv8-32 stubs

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: raspberrypi/linux#1989 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
pelwell · May 8, 2017 · b23276d · b23276d
1 parent 0e906eb
commit b23276d
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/armstubs/armstub7.S b/armstubs/armstub7.S
@@ -107,6 +107,7 @@ jmp_loader:
 
 	add	r5, #(0x400000CC-0x4000008C)	@ mbox
 1:
+	wfe
 	ldr	r4, [r5, r0, lsl #4]
 	cmp	r4, r3
 	beq	1b