[U-Boot] [PATCH v2] mxs: fixed battery boot on imx233-olinuxino-micro

[Marek Vasut]

On Tuesday, June 17, 2014 at 12:18:55 AM, Marek Vasut wrote:
> On Sunday, June 15, 2014 at 03:11:56 PM, Peter Schumann wrote:
> > This patch makes it possible to boot from battery on olinuxino Boards
> > from Olimex.
> > 
> > We should not set DOUBLE_FETS in HW_POWER_MINPWR, it makes my system
> > reset with in seconds while running on battery power.
> > 
> > Also  mxs_power_enable_4p2() should not be called if running from
> > battery. It switches VDDD and VDDA to LinReg mode and than turns off
> > the VDDIO DCDC supply. At this point the system resets.
> > If we run on battery this is no good idea because the LinRegs are
> > chained behind VDDIO and battery voltage seems not enough to power
> > the system from LinRegs.
> > Also is the power system already running on DCDC after BootROM hands
> > over to u-boot, so no sense in switching back to LinRegs.
> > 
> > Signed-off-by: Peter Schumann <peter.schumann at jeepxj.de>
> 
> +CC Fabio, I'd like to see his take on this too.

Reviewed-by: Marek Vasut <marex at denx.de>

I'd like to get this merged after 2014.07 though, so it can get some proper 
testing. We're too late in the -rc cycle anyway ...

Best regards,
Marek Vasut