[U-Boot] [PATCH v2 0/2] ARM: AM43xx: Add support for RTC only mode

[Keerthy]

Kernel stores information to the RTC_SCRATCH0 and RTC_SCRATCH1 registers
for wakeup from RTC-only mode. Parse these registers during SPL boot and
jump to the kernel resume vector if the device is waking up from RTC-only
mode.

The RTC scratch register layout used is:

SCRATCH0 : bits00-31 : kernel resume address
SCRATCH1 : bits00-15 : RTC magic value used to detect valid config
SCRATCH1 : bits16-31 : board type information populated by bootloader

During the normal boot path the SCRATCH1 : bits16-31 are updated with
the eeprom read board type data. In the rtc_only boot path the rtc
scratchpad register is read and the board type is determined and
correspondingly ddr dpll parameters are set. This is done so as to avoid
costly i2c read to eeprom.

RTC-only mode support is currently only enabled for
am43xx_evm_rtconly_config.
This is not to be used with epos evm builds.

Dave Gerlach (1):
  am43xx: Do not allow EMIF to control DDR_RESET in rtconly config

Tero Kristo (1):
  ARM: AM43xx: Add support for RTC only mode

 arch/arm/include/asm/arch-am33xx/clock.h  |   6 ++
 arch/arm/mach-omap2/am33xx/Kconfig        |  14 ++++
 arch/arm/mach-omap2/am33xx/board.c        | 110 +++++++++++++++++++++++++++---
 arch/arm/mach-omap2/am33xx/clock.c        |  10 +++
 arch/arm/mach-omap2/am33xx/clock_am43xx.c |  21 ++++++
 arch/arm/mach-omap2/am33xx/emif4.c        |   5 ++
 board/ti/am43xx/MAINTAINERS               |   1 +
 board/ti/am43xx/board.c                   |  56 +++++++++++++++
 configs/am43xx_evm_rtconly_defconfig      |  59 ++++++++++++++++
 9 files changed, 274 insertions(+), 8 deletions(-)
 create mode 100644 configs/am43xx_evm_rtconly_defconfig

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1.9.1