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 <abrod...@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]
--
2.7.4
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