From: Lucian-Raul Silistru <lucian-raul.silis...@intel.com>
When running on a multicore device with SMP disabled it is possible
for unused harts to still be pulled out of reset. This change parks
them in a wfi loop.
Updates #4735
---
bsps/riscv/shared/start/start.S | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/bsps/riscv/shared/start/start.S b/bsps/riscv/shared/start/start.S
index a8ff1b079f..da5cd2be67 100644
--- a/bsps/riscv/shared/start/start.S
+++ b/bsps/riscv/shared/start/start.S
@@ -71,6 +71,8 @@ SYM(_start):
bnez s0, .Lstart_on_secondary_processor
add sp, sp, t2
#else
+ csrr s0, mhartid
+ bnez s0, .Lblock_on_unused_processor
LADDR sp, _ISR_Stack_area_end
#endif
@@ -144,4 +146,8 @@ SYM(_start):
.word 0x00100073
#endif
+#else /* RTEMS_SMP */
+.Lblock_on_unused_processor:
+ wfi
+ bnez s0, .Lblock_on_unused_processor
#endif /* RTEMS_SMP */
--
2.25.1
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