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 gruss@tss-engineering.com Signed-off-by: Damien Gotfroi dgotfroi@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,