firmware: Add nop to reduce bus traffic.

All the non-boot harts run in a tight loop which may cause a heavy load on the memory bus. This may delay the boot hart to complete the cold boot process. Introduce few nop that will ease up the traffic. Signed-off-by: Atish Patra <atish.patra@wdc.com>
riscv-software-src · Mar 7, 2019 · 4e44e06 · 4e44e06
1 parent 130273a
commit 4e44e06
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/firmware/fw_base.S b/firmware/fw_base.S
@@ -116,6 +116,10 @@ _fdt_reloc_done:
 _wait_for_boot_hart:
 	la	a4, _boot_hart_done
 	REG_L	a5, (a4)
+	/* Reduce the bus traffic so that boot hart may proceed faster */
+	nop
+	nop
+	nop
 	beqz	a5, _wait_for_boot_hart
 
 _start_warm: