[U-Boot] [PATCH v4 1/2] ARM: AM43xx: Add support for RTC only + DDR in self-refresh mode

[Tom Rini]

On Sat, Mar 17, 2018 at 01:32:52PM +0530, Keerthy wrote:

> From: Tero Kristo <t-kristo at ti.com>
> 
> Kernel stores information to the RTC_SCRATCH0 and RTC_SCRATCH1 registers
> for wakeup from RTC-only mode with DDR in self-refresh. Parse these
> registers during SPL boot and jump to the kernel resume vector if the
> device is waking up from RTC-only modewith DDR in Self-refresh.
> 
> 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 +DRR in self-refresh mode support is currently only enabled for
> am43xx_evm_rtconly_config.
> This is not to be used with epos evm builds.
> 
> Signed-off-by: Tero Kristo <t-kristo at ti.com>
> [j-keerthy at ti.com Rebased to latest u-boot master branch]
> Signed-off-by: Keerthy <j-keerthy at ti.com>

Reviewed-by: Tom Rini <trini at konsulko.com>

-- 
Tom
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