[U-Boot] [PATCH 1/2] ARM: AM43xx: Add support for RTC only mode

[Tom Rini]

On Thu, Mar 15, 2018 at 05:58:47PM +0530, Keerthy wrote:
> 
> 
> On Thursday 15 March 2018 05:56 PM, Tom Rini wrote:
> > On Thu, Mar 15, 2018 at 04:09:52PM +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. Parse these registers during SPL boot and
> >> jump to the kernel resume vector if the device is waking up from RTC-only
> >> mode.
> > [snip]
> >> diff --git a/arch/arm/mach-omap2/am33xx/Kconfig b/arch/arm/mach-omap2/am33xx/Kconfig
> >> index 9a9ccd7..5ff4a85 100644
> >> --- a/arch/arm/mach-omap2/am33xx/Kconfig
> >> +++ b/arch/arm/mach-omap2/am33xx/Kconfig
> >> @@ -239,6 +239,13 @@ config TARGET_CM_T43
> >>  
> >>  endchoice
> >>  
> >> +config SPL_RTC_ONLY_SUPPORT
> >> +	bool
> >> +	depends on SPL
> >> +	prompt "Enable RTC ONLY Support"
> >> +	help
> >> +	  If you want RTC ONLY Support, say Y.
> > 
> > Please expand on the help content here.
> 
> Sure
> 
> > 
> > [snip]
> >> +/*
> >> + * RTC only mode magic value, checked against during boot to see if we have
> >> + * a valid config
> >> + */
> >> +#define RTC_MAGIC_VAL		0x8cd0
> > 
> > Update the comment to include where this value needs to be kept in sync
> > with (what file in the kernel?).
> 
> Okay.
> 
> > 
> > [snip]
> >> +CONFIG_OF_LIST="am437x-gp-evm am437x-sk-evm am43x-epos-evm am437x-idk-evm"
> > 
> > We don't support this on all of those, do we?  I thought the comments
> > said you can't do it on ePOS...  Thanks!
> 
> The config should surely have all the above booting. The RTC-Only mode
> will not be supported in ePOS.

So we keep ePOS here to ensure that enabling it doesn't break on HW it's
not supported on?  OK..  Thanks!

-- 
Tom
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