# Fw\_printenv configuration file for imx8mp-sr-som

**URL:** <https://community.solid-run.com/t/fw-printenv-configuration-file-for-imx8mp-sr-som/1116>\
**Category:** Uncategorized\
**Tags:** yocto\
**Created:** [March 12, 2026, 3:33pm UTC](https://community.solid-run.com/t/fw-printenv-configuration-file-for-imx8mp-sr-som/1116 "2026-03-12T15:33:32Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Christophe](https://avatars.discourse-cdn.com/v4/letter/c/848f3c/32.png) [@Christophe](https://community.solid-run.com/u/Christophe)\
**Post date:** [March 12, 2026, 3:33pm UTC](https://community.solid-run.com/t/fw-printenv-configuration-file-for-imx8mp-sr-som/1116/1 "2026-03-12T15:33:32Z")

</div>

Hello,

I’m configuring Rauc for an HummingBoard Pro boad (i.MX8M Plus) under Yocto (scarthgap).  
I’m currently facing an issue with `fw_printenv` which complains with the following message:

```sh
root@imx8mp-sr-som:~# fw_printenv 
Cannot read environment, using default
Cannot read default environment from file

```

Here is my `fw_printenv` configuration file (copied from `meta-freescale-3rdparty/recipes-bsp/u-boot/u-boot-boundary/mx8mp-generic-bsp/fw_env.config`):

```sh
root@imx8mp-sr-som:~# cat /etc/fw_env.config
/dev/mmcblk2boot0	-0x2000 0x2000

```

I’ve got the same result if I replace `/dev/mmcblk2boot0` by `/dev/mmcblk2boot1`.  
Note also that `printenv` and `saveenv` work fine in the uboot command line.

I’m pretty new to the u-boot, so I may have forgotten a basic configuration step at some point. I basically did nothing else than using the `fw_printenv` provided by the BSP and adding my configuration file to `/etc/fw_env.config`.

Any idea of what could be wrong?  
Thanks by advance for your answer!

---

<div class="post-metadata">

**Author:** ![Christophe](https://avatars.discourse-cdn.com/v4/letter/c/848f3c/32.png) [@Christophe](https://community.solid-run.com/u/Christophe)\
**Post date:** [March 22, 2026, 10:35am UTC](https://community.solid-run.com/t/fw-printenv-configuration-file-for-imx8mp-sr-som/1116/2 "2026-03-22T10:35:30Z")

</div>

Hello,

I’m still struck with this problem.  
Please can you confirm that fw\_printenv should work and give me the content of `/etc/fw_env.config`?

---

<div class="post-metadata">

**Author:** ![Christophe](https://avatars.discourse-cdn.com/v4/letter/c/848f3c/32.png) [@Christophe](https://community.solid-run.com/u/Christophe)\
**Post date:** [April 13, 2026, 12:20pm UTC](https://community.solid-run.com/t/fw-printenv-configuration-file-for-imx8mp-sr-som/1116/3 "2026-04-13T12:20:40Z")

</div>

I finally found the solution in [`configs/imx8mp_solidrun_defconfig`](https://github.com/SolidRun/u-boot/blob/lf-6.6.52-2.2.0-sr-imx8/configs/imx8mp_solidrun_defconfig).  
The subtle point was to look in the right branch (`lf-6.6.52-2.2.0-sr-imx8`) of the [solidrun’s u-boot repo](https://github.com/SolidRun/u-boot) (as stated in `meta-solidrun-arm-imx8/recipes-bsp/u-boot/u-boot-imx_2024.04.bbappend\`)…

In this file, man can see:

```auto
CONFIG_ENV_SIZE=0x80000
CONFIG_ENV_OFFSET=0x380000
CONFIG_ENV_IS_IN_MMC=y
CONFIG_SYS_MMC_ENV_DEV=1

```

Which means that the content of `/etc/fw_env.config` should be:

```auto
/dev/mmcblk2 0x380000 0x80000

```