firmware: fw_base.S: fix multi-core boot bug.

In a multi-core startup scenario, if both _try_lottery and _wait_for_boot_hart use the data in the _boot_status address, when a CPU enters OpenSBI later than boot hart set the _boot_status to BOOT_STATUS_BOOT_HART_DONE, the CPU will modify _boot_status to 1 by amoswap.w and will never be awakened in _wait_for_boot_hart. So let _try_lottery and _boot_status use data from two addresses. Signed-off-by: dong.yang <[email protected]>
sophgo · Sep 8, 2024 · fa4ca5a · fa4ca5a
1 parent 537f010
commit fa4ca5a
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/firmware/fw_base.S b/firmware/fw_base.S
@@ -47,7 +47,7 @@ _start:
 	bne	a0, a6, _wait_for_boot_hart
 _try_lottery:
 	/* Jump to relocation wait loop if we don't get relocation lottery */
-	lla	a6, _boot_status
+	lla	a6, _relocate_lottery
 	li	a7, BOOT_STATUS_LOTTERY_DONE
 	amoswap.w a6, a7, (a6)
 	bnez	a6, _wait_for_boot_hart
@@ -371,6 +371,8 @@ _skip_trap_handler_hyp:
 
 	.data
 	.align 3
+_relocate_lottery:
+	RISCV_PTR   0
 _boot_status:
 	RISCV_PTR	0