topic Re: Create new U-Boot Environment Variable in i.MX Processors

Create new U-Boot Environment Variable

MichaelBMiner — Thu, 23 Feb 2023 22:11:28 GMT

Hello,

I have implemented SWUpdate and I can successfully upgrade my kernel and OS. Now I am trying to create two new U-Boot environment variables.

CONFIG_KERNEL_TO_RUN and CONFIG_SWUPDATE_BOOTCMD. The idea is CONFIG_KERNEL_TO_RUN can have the values 0 or 1. If the value is 1 run the SWUpdate kernel to receive a new update, or run the default image kernel.

To add these new variables I am attempting to patch the mx6ul_14x14_evk.h file in build-fb/tmp/work/imx6ull14x14evk-poky-linux-gnueabi/u-boot-imx/2021.04-r0. My patch is properly applied but when I run my device and enter the bootloader, running printenv my new setting is not present.

Note I have only attempted to add CONFIG_SWUPDATE_BOOTCMD at this point. Here is my patch file.

--- a/include/configs/mx6ul_14x14_evk.h 2023-02-23 15:43:58.407930365 -0600 +++ b/include/configs/mx6ul_14x14_evk.h 2023-02-23 15:41:52.594126013 -0600 @@ -120,6 +120,7 @@ "boot_fdt=try\0" \ "ip_dyn=yes\0" \ "splashimage=0x8c000000\0" \ + "swupdate_bootcmd="__stringify(CONFIG_SWUPDATE_BOOTCMD)"\0" \ "mmcdev="__stringify(CONFIG_SYS_MMC_ENV_DEV)"\0" \ "mmcpart=" __stringify(CONFIG_SYS_MMC_IMG_LOAD_PART) "\0" \ "mmcroot=" CONFIG_MMCROOT " rootwait rw\0" \ @@ -218,6 +219,17 @@ "fi; " \ "fi; " \ "else run netboot; fi" + +#define CONFIG_SWUPDATE_BOOTCMD \ + "setenv bootargs console=ttymxc0,115200 root=/dev/ram0 rootfstype=ext4 rw ;" \ + "load mmc 1:3 0x83000000 /swupdate-image-imx6ull14x14evk.ext4.gz.u-boot;" \ + "load mmc 1 0x82a00000 imx6ull-14x14-evk.dtb;" \ + "load mmc 1 0x80800000 zImage;" \ + "load mmc 1 0x83000000 300000 100000;" \ + "setenv root /dev/ram0;" \ + "setenv rootfstype ext4;" \ + "setenv fw_env_config /etc/fw_env.config;" \ + "bootz 0x80800000 0x83000000 0x82a00000;" #endif /* Miscellaneous configurable options */

Is there something I am missing? I figured if I told uboot about this new setting it would just appear.

Re: Create new U-Boot Environment Variable

MichaelBMiner — Thu, 23 Feb 2023 22:12:28 GMT

To test SWUpdate I was manually running the commands

setenv swupdate_bootcmd "setenv bootargs console=ttymxc0,115200 root=/dev/ram0 rootfstype=ext4 rw ; load mmc 1:3 0x83000000 /swupdate-image-imx6ull14x14evk.ext4.gz.u-boot;load mmc 1 0x82a00000 imx6ull-14x14-evk.dtb;load mmc 1 0x80800000 zImage;load mmc 1 0x83000000 300000 100000;setenv root /dev/ram0;setenv rootfstype ext4;setenv fw_env_config /etc/fw_env.config;bootz 0x80800000 0x83000000 0x82a00000" savenev run swupdate_bootcmd

I am now trying to automate this process.

Re: Create new U-Boot Environment Variable

MichaelBMiner — Fri, 24 Feb 2023 14:28:04 GMT

Dumb mistake I was patching the wrong header file. I was patching mx6ul_14x14_evk.h but needed to patch mx6ullevk.h.

I found this by looking into the file tmp/work/imx6ull14x14evk-poky-linux-gnueabi/u-boot-imx/2021.04-r0/build/mx6ull_14x14_evk_emmc_config/include/config.h which contains

/* Automatically generated - do not edit */ #define CONFIG_IMX_CONFIG board/freescale/mx6ullevk/imximage.cfg #define CONFIG_BOARDDIR board/freescale/mx6ullevk #include <config_uncmd_spl.h> #include <configs/mx6ullevk.h> #include <asm/config.h> #include <linux/kconfig.h> #include <config_fallbacks.h>