saveenv not available in Debian 8.4 images

[greg.di...@gmail.com]

Hi,

The saveenv command is not able in the U-boot console, any idea why?

Thanks,

[Robert Nelson]

On Tue, Apr 12, 2016 at 12:53 PM, <greg.di...@gmail.com> wrote:

Hi,

The saveenv command is not able in the U-boot console, any idea why?

saveenv needs a default storage..

Since these images can be used on both the BeagleBone "White" and BeagleBone Black..

default storage = microSD..

So now saveenv doesn't work if you are using the eMMC on the Black..

default storage = eMMC

Now it doesn't work on the White..

Therefore, i disable it..

(it also use to break boot on the White, when it was searching the eMMC (which doesn't exist on the white) for the default environment..)

Regards,

--

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

[greg.di...@gmail.com]

Thanks,

If I require for u-boot to have this functionality on BeagleBone Black (and use eMMC as the default storage), I guess I can go ahead and create my own Debian image and turn on the saveenv functionality, but where is this functionality explicitly disabled?

Regards,

[Robert Nelson]

On Tue, Apr 12, 2016 at 2:43 PM, <greg.di...@gmail.com> wrote:

Thanks,

If I require for u-boot to have this functionality on BeagleBone Black (and use eMMC as the default storage), I guess I can go ahead and create my own Debian image and turn on the saveenv functionality, but where is this functionality explicitly disabled?

This one line:

https://github.com/RobertCNelson/Bootloader-Builder/blob/master/patches/v2016.03/0001-am335x_evm-uEnv.txt-bootz-n-fixes.patch#L177

Then just rebuild u-boot and dd MLO/u-boot.img to your drive:

https://eewiki.net/display/linuxonarm/BeagleBone+Black#BeagleBoneBlack-Bootloader:U-Boot

https://eewiki.net/display/linuxonarm/BeagleBone+Black#BeagleBoneBlack-SetupmicroSDcard

You won't have to /dev/zero your drive, just dd over the exiting MLO/u-boot.img...

Regards,

[vl.a...@gmail.com]

Hello Robert,

Can you please describe more precisely how to enable uboot saveenv command for BeagleBone Black?

I could not understand how patch line 177 relates to saveenv command.



вторник, 12 апреля 2016 г., 23:09:45 UTC+3 пользователь RobertCNelson написал:

[Robert Nelson]

On Wed, Feb 22, 2017 at 8:37 AM, <vl.a...@gmail.com> wrote:
> Hello Robert,
>
> Can you please describe more precisely how to enable uboot saveenv command
> for BeagleBone Black?
>
> I could not understand how patch line 177 relates to saveenv command.
>

well now it's line 155

[vl.a...@gmail.com]

Thanks!

I commented define in the file include/configs/am335x_evm.h
#define CONFIG_ENV_IS_NOWHERE

After that I found saveenv command in uboot. But in this case saveenv command cause error "Unable to use mmc 0:1 for saveenv". I decided that I also should specify where I want to save environment variables. In source code I found that define CONFIG_EMMC_BOOT is used for RAW mode. I added define CONFIG_EMMC_BOOT in include/configs/am335x_evm.h and it seems that saveenv works now. I can see that raw data in emmc is not empty now:

root@user:~# hexdump -C /dev/mmcblk1boot1
00000000  7a f0 38 b3 04 61 72 63  68 3d 61 72 6d 00 61 72  |z.8..arch=arm.ar|
00000010  67 73 5f 66 69 74 3d 73  65 74 65 6e 76 20 62 6f  |gs_fit=setenv bo|
00000020  6f 74 61 72 67 73 20 63  6f 6e 73 6f 6c 65 3d 24  |otargs console=$|
00000030  7b 63 6f 6e 73 6f 6c 65  7d 20 00 61 72 67 73 5f  |{console} .args_|
00000040  6d 6d 63 3d 72 75 6e 20  66 69 6e 64 75 75 69 64  |mmc=run finduuid|
00000050  3b 73 65 74 65 6e 76 20  62 6f 6f 74 61 72 67 73  |;setenv bootargs|
00000060  20 63 6f 6e 73 6f 6c 65  3d 24 7b 63 6f 6e 73 6f  | console=${conso|
00000070  6c 65 7d 20 24 7b 63 61  70 65 5f 64 69 73 61 62  |le} ${cape_disab|
00000080  6c 65 7d 20 24 7b 63 61  70 65 5f 65 6e 61 62 6c  |le} ${cape_enabl|
00000090  65 7d 20 24 7b 63 61 70  65 5f 75 62 6f 6f 74 7d  |e} ${cape_uboot}|




среда, 22 февраля 2017 г., 18:55:42 UTC+3 пользователь RobertCNelson написал:

[Denys Yurchenko]

It is wrong way edit an u-boot source files.

The write way is change CONFIG_ENV_IS_NOWHERE=y to CONFIG_ENV_IS_NOWHERE=n and add CONFIG_SYS_EXTRA_OPTIONS="EMMC_BOOT"  to u-boot/configs/am335x_boneblack_defconfig (or to u-boot/configs/am335x_boneblack_vboot_defconfig) file.

Best regards.

[gim...@gmail.com]

thank you!