Section 4.1.2 of Freescale Application Note AN4199 describes the
configuration required to operate the mx28 from a 5V source without a
battery. This patch implements the changes to the Freescale bootlets
which allow this configuration to properly boot the mx28 processor
Signed-off-by: Graeme Russ <gr...@tss-engineering.com>
Signed-off-by: Damien Gotfroi <dgotf...@greenwatch.be>
---
Changes in v2
- Implemented Damien Gotfroi's simplified version
---
arch/arm/cpu/arm926ejs/mxs/spl_power_init.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/arch/arm/cpu/arm926ejs/mxs/spl_power_init.c
b/arch/arm/cpu/arm926ejs/mxs/spl_power_init.c
index 7fb734e..0634c81 100644
--- a/arch/arm/cpu/arm926ejs/mxs/spl_power_init.c
+++ b/arch/arm/cpu/arm926ejs/mxs/spl_power_init.c
@@ -14,6 +14,12 @@
#include "mxs_init.h"
+#ifdef CONFIG_SYS_MXS_VDD5V_ONLY
+#define DCDC4P2_DROPOUT_CONFIG POWER_DCDC4P2_DROPOUT_CTRL_100MV
+#else
+#define DCDC4P2_DROPOUT_CONFIG POWER_DCDC4P2_DROPOUT_CTRL_100MV | \
+ POWER_DCDC4P2_DROPOUT_CTRL_SRC_SEL
+#endif
/**
* mxs_power_clock2xtal() - Switch CPU core clock source to 24MHz XTAL
*
@@ -303,8 +309,7 @@ static void mxs_power_init_4p2_params(void)
clrsetbits_le32(&power_regs->hw_power_dcdc4p2,
POWER_DCDC4P2_DROPOUT_CTRL_MASK,
- POWER_DCDC4P2_DROPOUT_CTRL_100MV |
- POWER_DCDC4P2_DROPOUT_CTRL_SRC_SEL);
+ DCDC4P2_DROPOUT_CONFIG);
clrsetbits_le32(&power_regs->hw_power_5vctrl,
POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK,
--
1.9.3
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