From c8fd8e66cdd9bf8b4fe78eaaa9bc1000fa60ae85 Mon Sep 17 00:00:00 2001
From: Akshay Saraswat <akshay.s@samsung.com>
Date: Fri, 20 Feb 2015 13:27:19 +0530
Subject: [PATCH] Exynos542x: Make A7s boot with thumb-mode U-Boot on warm
reset
On warm reset, all cores jump to the low_power_start function because iRAM
data is retained and because while executing iROM code all cores find
the jump flag 0x02020028 set. In low_power_start, cores check the reset
status and if true they clear the jump flag and jump back to 0x0.
The A7 cores do jump to 0x0 but consider following instructions as a Thumb
instructions which in turn makes them loop inside the iROM code instead of
jumping to power_down_core.
This issue is fixed by replacing the "mov pc" instruction with a "bx"
instruction which switches state along with the jump to make the execution
unit consider the branch target as an ARM instruction.
Signed-off-by: Akshay Saraswat <akshay.s@samsung.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
---
arch/arm/cpu/armv7/exynos/lowlevel_init.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/cpu/armv7/exynos/lowlevel_init.c b/arch/arm/cpu/armv7/exynos/lowlevel_init.c
index 782ecd1115..329ab0cf8e 100644
--- a/arch/arm/cpu/armv7/exynos/lowlevel_init.c
+++ b/arch/arm/cpu/armv7/exynos/lowlevel_init.c
@@ -103,7 +103,7 @@ static void low_power_start(void)
reg_val = readl(EXYNOS5420_SPARE_BASE);
if (reg_val != CPU_RST_FLAG_VAL) {
writel(0x0, CONFIG_LOWPOWER_FLAG);
- set_pc(0x0);
+ branch_bx(0x0);
}
reg_val = readl(CONFIG_PHY_IRAM_BASE + 0x4);
--
2.39.5