Re: [U-Boot] mxs power initialization
Hi Stefan,
-----Oorspronkelijk bericht----- Van: Stefan Wahren [mailto:stefan.wahren@i2se.com] Verzonden: zaterdag 6 juni 2015 08:38 Aan: Ruud Commandeur Onderwerp: Re: [U-Boot] mxs power initialization
Hi,
Ruud Commandeur RCommandeur@clb.nl hat am 5. Juni 2015 um
16:38 geschrieben:
Hi Everyone,
I'm trying to make an i.mx28 board work with a Goldcap
attached to the
Battery pin for RTC backup. This does not work out of the
box, but I
found a number of useful tips to work with. Most of these
tips either
refer to the imx bootlets or to code of "spl_power_init.c"
where the mxs power registers are configured.
I do not use the imx bootlets, so spl_power_init was the
place to be I
thought. However, it appears to be that this code is only
used if an
SPL_BUILD is configured (am I correct?). But if SPL is not
used, which
(code) part is used then to configure the imx power
registers (if there is any)?
i don't have answer to your question, but i want to mention that i working on the mxs power driver for Linux mainline. But my focus is on 5V only power supply.
Beside the imx bootlets i took the power driver from the Freescale downstream kernel as a source of knowledge [1]. May be that is helpful.
Best regards Stefan
[1] - http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/tr ee/drivers/power/mxs/linux.c?h=imx_2.6.35_maintain
I was already wondering if the kernel would play a role here. For some reason this part was never mentioned when looking for these power issues. For some initial config bits this should not matter, but if actions should be taken on e.g. power-fail, this must reside in the kernel part.
Anyway: We use the mainline 3.10 LTS and obviously this does not have this mxs directory as for the 2.6.35 Freescale one. Would you happen to know if a similar (mxs-specific) driver should be present here?
P.S. I did put the u-boot-list on cc to inform about the answer(s). If the subject would change to kernel related subjects only, we could (or should) stop this I guess.
Thanks in advance for your help,
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