How to modify default empty string on U-Boot to stop Autoboot in Yocto

Question

I am using the SAMA5D27-SOM1-EK-SD evaluation kit and I would like to make some changes to U-Boot, in particular the Autoboot settings. I am able to load a kernel image using Yocto, and by default when U-Boot loads, it asks user to "Hit any key to STOP autoboot". I'd like for this empty string to be a custom string (e.g "abort").

Following other posts, I can do this by modifying the sama5d27_som1_ek_mmc_defconfig, but I don't see a variable to modify.

Also, I've tried changing the string by using "menuconfig" and I'm able set the string; and settings get saved in a ".config" file, but I don't think I could modify this file as it is an output.

Which file should I be modifying?

I appreciate your help in advance.

Thanks.

Gil

"Which file should I be modifying?" - Possibly none. You would first have to use the menuconfig system to properly configure U-Boot. Study doc/README.autoboot. For the mentioned environment variables, see stackoverflow.com/questions/75547754/…. — sawdust
– sawdust, Commented Jan 22, 2024 at 4:59
I'm able to launch u-boot menuconfig by running "bitbake u-boot -c devshell" -> make menuconfig. I am able to get into "Boot Options -> Autoboot Options" and modify the corresponding variables, Delay and Stop autbooting via specific input key/string. I verified these changes are made in the ".config" file (e.g CONFIG_BOOTDELAY=20, CONFIG_AUTOBOOT_STOP_STR="stop"). I then run bitbake core-image-minimal; but I don't see the mods on my SAMA5D27 target board. Is this process correct? Are there any other files I have to modify? Appreciate your feedback. — GMAN_82
– GMAN_82, Commented Jan 24, 2024 at 16:24
"but I don't see the mods ..." - So how did you verify that you booted the new binary? How did you verify that you installed the new binary? How did you verify that you built a new binary? — sawdust
– sawdust, Commented Jan 24, 2024 at 20:43

Cleiton Bueno · Accepted Answer · 2024-01-21 19:33:04Z

-1

Try configure CONFIG_BOOTDELAY[1] with value -2.

What version of u-boot are you using?

answered Jan 21, 2024 at 19:33

Cleiton Bueno

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GMAN_82 Over a year ago

I am using "U-Boot 2023.07-.02-linux4microchip-2023.10-rc3". It still doesn't work when I make the assignment. Also, in the sama5d27_som1_ek_mmc_defconfig file, I don't see the option to change the STOP_STRING; only CONFIG_BOOTDELAY. Do I have have to make my own defconfig and add this variable to it? Thanks

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