extlinux.conf DEFAULT kernel boot

Autonomous Machines Jetson & Embedded Systems Jetson TX2
#1

I have restored a system using a cloned image and seeing an issue.

It has only one kernel image installed and the TIMEOUT is set to 2 sec but during bootup, bootloader waits for the user to select the kernel manually (even after timeout).

TIMEOUT 2
DEFAULT primary

MENU TITLE p2771-0000 eMMC boot options

LABEL primary
MENU LABEL primary kernel
LINUX /boot/Image
APPEND ${cbootargs} root=/dev/mmcblk0p1 rw rootwait rootfstype=ext4 noinitrd

…
…
Found /boot/extlinux/extlinux.conf
Retrieving file: /boot/extlinux/extlinux.conf
409 bytes read in 65 ms (5.9 KiB/s)
p2771-0000 eMMC boot options
1: primary kernel
Enter choice:

Bootloader waits at ‘Enter choice’ indefinitely until you select the kernel.

The issue is not seen with the original system, any suggestions on how to resolve this?

#2

You may check https://devtalk.nvidia.com/default/topic/1028415/jetson-tx2/nvidias-u-boot-doesn-t-honor-default-boot-menu-label-/post/5232342/#5232342.

#3

@Honey_Patouceul, thank you very much, that fixed my issue.

#4

I did set this, even bootdelay=-2, but I have a device that always sends data through UART, which u-boot confuses to be a key.

So it still waits at Enter choice: …

Is there any chance setting the default Kernel as Primary Kernel, and make u-boot skip this selection via cbootargs or something?

Thank you.

#5

The delay can be reduced, but I think a complete disable would require recompiling a custom U-Boot. If the serial UART is not used as a serial console you really have to disconnect the UART until boot is past U-Boot…and that only works if you disabled serial console in Linux (this latter is trivial to accomplish, whereas disable in U-Boot is not). Are you using this port for something other than serial console?

#6

Are you able to set stdin to anything else than serial (say usbkbd or usbtty, maybe after after usb start) and saveenv ?
If not, as mentioned by @Linuxdev, you may indeed have to rebuild your own uboot.

#7

I probably can, because I could set boot_delay to -2. And now I can’t change any parameters because of that. :-) .

Will changing stdin to any other, for example, non-existing ttySSS, will solve this? I’ll try to reset u-boot somehow, (disable boot_delay=-2) if it does.

#8 
Environment size: 4442/8188 bytes
Tegra210 (P2371-2180) # setenv stdin ttySSS
## Error inserting "stdin" variable, errno=22
Tegra210 (P2371-2180) # setenv stdin tty   
## Error inserting "stdin" variable, errno=22
Tegra210 (P2371-2180) # setenv stdin usbkbd
## Error inserting "stdin" variable, errno=22
Tegra210 (P2371-2180) # setenv stdin usbkbd
## Error inserting "stdin" variable, errno=22
Tegra210 (P2371-2180) # setenv stdin usbkbd
## Error inserting "stdin" variable, errno=22
Tegra210 (P2371-2180) # setenv stdin NULL  
## Error inserting "stdin" variable, errno=22
Tegra210 (P2371-2180) # setenv stdin asd 
## Error inserting "stdin" variable, errno=22
Tegra210 (P2371-2180) # setenv stdin asdasdf
## Error inserting "stdin" variable, errno=22
Tegra210 (P2371-2180) # setenv stdin serial 
Tegra210 (P2371-2180) # setenv stdin null  
## Error inserting "stdin" variable, errno=22
Tegra210 (P2371-2180) # setenv stdin usb 
## Error inserting "stdin" variable, errno=22
Tegra210 (P2371-2180) # setenv stdin usbb
## Error inserting "stdin" variable, errno=22
Tegra210 (P2371-2180) # setenv stdin usbba
## Error inserting "stdin" variable, errno=22
Tegra210 (P2371-2180) # setenv stdin usbtty
## Error inserting "stdin" variable, errno=22
Tegra210 (P2371-2180) # setenv stdin usbtty
#9

Perhaps try using “/dev/null” for the input…this exists, and is a character device (just like a tty).

#10 
Tegra210 (P2371-2180) # setenv stdin  "/dev/null"
## Error inserting "stdin" variable, errno=22
Tegra210 (P2371-2180) # setenv stdin "/dev/null" 
## Error inserting "stdin" variable, errno=22
Tegra210 (P2371-2180) # setenv stdin /dev/null  
## Error inserting "stdin" variable, errno=22

This doesn’t work as well. Since serial looks like a keyword, I doubt just typing in a device name would fit. (I think it needs to be a specific option for setenv stdint, but I failed to find any documentation about it on the web.)

#11