[U-Boot] [PATCH] exynos: Rise ARM voltage to 1.1V for chained bootloaders

Misha Komarovskiy zombah at gmail.com
Tue Aug 25 10:53:26 CEST 2015


If board uses downstream Chrome OS U-Boot as first stage
bootloader and upstream version is chained second stage,
1.1V is minimum voltage borderline.

Signed-off-by: Misha Komarovskiy <zombah at gmail.com>
---
 board/samsung/common/exynos5-dt.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/board/samsung/common/exynos5-dt.c b/board/samsung/common/exynos5-dt.c
index 7d1b88a..a550d00 100644
--- a/board/samsung/common/exynos5-dt.c
+++ b/board/samsung/common/exynos5-dt.c
@@ -121,11 +121,12 @@ int exynos_power_init(void)
 		return ret;
 
 	/*
-	 * This would normally be 1.3V, but since we are running slowly 1V
+	 * This would normally be 1.3V, but since we are running slowly 1.1V
 	 * is enough. For spring it helps reduce CPU temperature and avoid
-	 * hangs with the case open.
+	 * hangs with the case open. 1.1V is minimum voltage borderline for 
+	 * chained bootloaders.
 	 */
-	ret = exynos_set_regulator("vdd_arm", 1000000);
+	ret = exynos_set_regulator("vdd_arm", 1100000);
 	if (ret)
 		return ret;
 	ret = exynos_set_regulator("vdd_int", 1012500);
-- 
1.8.4.5



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