[U-Boot] can u-boot tools fw_{printenv, setenv} work with eMMC HW partition?

[Luka Perkov <luka@openwrt.org>]

On Fri, Aug 23, 2013 at 05:11:01PM -0400, Robert P. J. Day wrote:
> On Fri, 23 Aug 2013, Luka Perkov wrote:
> 
> > On Fri, Aug 23, 2013 at 08:25:07AM -0400, Robert P. J. Day wrote:
> > >   i'm sure there's a simple answer to this -- i built u-boot for my
> > > beaglebone black using the "am335x_boneblack" config, which supports
> > > saving env info to the eMMC HW partition boot1. but now that it's
> > > there, is there a way i can manipulate that info with fw_printenv and
> > > fw_setenv?
> >
> > I have put this in OpenWrt:
> >
> > https://dev.openwrt.org/browser/trunk/package/boot/uboot-envtools/patches/110-add-support-for-MTD_ABSENT.patch
> > https://dev.openwrt.org/browser/trunk/package/boot/uboot-envtools/patches/115-writing-environment-for-mtd-devices.patch
> >
> > With those two you will be able to use fw_{printenv,setenv} on MMC
> > devices.
> 
>   i'll get a chance to test the above this weekend, but i just want to
> make absolutely sure we're talking about the same thing. are you
> saying that with the above patches, the u-boot-tools will be able to
> manipulate an eMMC HW partition just as easily as a regular MTD
> partition?

Yes.

> and, if so, what is the format of the entry one would add
> to /etc/fw_env.config to refer to that eMMC HW partition (in this
> case, boot1)?

I have done this for imx6 wandboard in OpenWrt:

https://dev.openwrt.org/browser/trunk/package/boot/uboot-envtools/files/imx6

So example config would look like:

/dev/mmcblk0 0x60000 0x2000 0x2000

Luka