Even though we expect only master core to execute U-Boot code let's make sure even if for some reason slave cores attempt to execute U-Boot in parallel with master they get halted very early.
If platform wants it may kick-start slave cores before passing control to say Linux kernel or any other application that want to see all cores of SMP SoC up and running.
Signed-off-by: Alexey Brodkin abrodkin@synopsys.com --- arch/arc/lib/start.S | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/arch/arc/lib/start.S b/arch/arc/lib/start.S index 90ee7e0fe406..b2ba7683097f 100644 --- a/arch/arc/lib/start.S +++ b/arch/arc/lib/start.S @@ -10,6 +10,22 @@ #include <asm/arcregs.h>
ENTRY(_start) + ; Non-masters will be halted immediately, they might be kicked later + ; by platform code right before passing control to the Linux kernel + ; in bootm.c:boot_jump_linux(). + lr r5, [identity] + lsr r5, r5, 8 + bmsk r5, r5, 7 + cmp r5, 0 + mov.nz r0, r5 + bz .Lmaster_proceed + flag 1 + nop + nop + nop + +.Lmaster_proceed: + /* Setup interrupt vector base that matches "__text_start" */ sr __ivt_start, [ARC_AUX_INTR_VEC_BASE]