From: Marek Vasut <marex@denx.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH v2] mxs: fixed battery boot on imx233-olinuxino-micro
Date: Tue, 17 Jun 2014 00:18:55 +0200 [thread overview]
Message-ID: <201406170018.55349.marex@denx.de> (raw)
In-Reply-To: <1402837916-20054-1-git-send-email-peter.schumann@jeepxj.de>
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@jeepxj.de>
+CC Fabio, I'd like to see his take on this too.
Best regards,
Marek Vasut
next prev parent reply other threads:[~2014-06-16 22:18 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-21 2:01 [U-Boot] [PATCH] mxs: fixed battery boot on imx233-olinuxino-micro Peter Schumann
2014-05-24 10:44 ` Marek Vasut
2014-05-25 20:02 ` Peter Schumann
2014-06-05 22:18 ` Marek Vasut
2014-06-13 1:04 ` Marek Vasut
2014-06-13 7:36 ` Peter Schumann
2014-06-13 10:33 ` Marek Vasut
2014-06-15 13:11 ` [U-Boot] [PATCH v2] " Peter Schumann
2014-06-16 22:18 ` Marek Vasut [this message]
2014-06-16 22:19 ` Marek Vasut
2014-06-17 16:00 ` Stefano Babic
2014-06-18 18:17 ` Peter Schumann
2014-06-19 7:12 ` Marek Vasut
2014-08-20 10:30 ` Stefano Babic
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