[meta-ti] U-Boot 2017.01 uEnv.txt Resolution (Raw Mode)

[Robert Nelson]

On Fri, Jul 14, 2017 at 6:18 PM, Kenny Koller
<kenny at understoryweather.com> wrote:
> I'm attempting to use the raw mode to boot a Beaglebone Black. I've loaded
> MLO and U-Boot at 128 kB and 384 kB and it successfully loads and runs
> U-Boot but fails to find and load a uEnv.txt because I'm unsure where to
> place it. I tried /boot on an EXT4 root filesystem.
>
> I suppose raw mode is a PPL thing and there is no way for U-Boot to know
> about this and it can only support one way of loading the environment (which
> is to fatload from partition 1)?
>
> I tried to resolve this in the Beaglebone community but I'm told that
> documentation won't be applicable unless I apply a patch. But I'd prefer to
> use the stock Yocto build.

Correct, my doc's utilize my patch..

it's weird how you have 10 posts on the community, but only actually
responded to '1' after someone has replied to most of them.. it's like
you just want us to do everything for you.. say it aint so...

> I hope you don't mind fielding this question. It's not clear to me how much
> of U-Boot is mainline from DENX, how much is from Robert Nelso, and how much
> is from meta-ti.

i do see an issue with pure-mainline u-boot:

61 #define BOOTENV_DEV_LEGACY_MMC(devtypeu, devtypel, instance) \
62         "bootcmd_" #devtypel #instance "=" \
63         "setenv mmcdev " #instance"; "\
64         "setenv bootpart " #instance":2 ; "\
65         "run mmcboot\0"

Change line 64, 2 -> 1

http://git.denx.de/?p=u-boot.git;a=blob;f=include/configs/am335x_evm.h;h=b97f525994d8002a1a44b17636fafc32eccbd20b;hb=HEAD#l64

as it's scanning the second partition by default..

so it should find /uEnv.txt after that fix for a single partition..

Regards,

-- 
Robert Nelson
https://rcn-ee.com/