What version of jetpack has the feature "Kernel Boot Sequence " ?only jetpack4.5? how can we make a usb disk image with an easy way?

what version of jetpack has the feature "Kernel Boot Sequence " ?only jetpack4.5?

how can we make a usb disk image with an easy way?

Do you want to boot kernel from external drive or you just want a big disk space for your file system?

Or you don’t know what is the difference between them?

we want to boot kernel from external drive like a 64g usb disk

Then just change the uboot boot order in the uboot console.

And prepare the drive as the document says.

https://docs.nvidia.com/jetson/l4t/index.html#page/Tegra%20Linux%20Driver%20Package%20Development%20Guide/flashing.html#wwpID0E0HM0HA

thx,we find this doc but
1、can we flash the usb drive like the sd card flashing way?

2、how to change the uboot boot order ? how can we enter the uboot console?

Use the uart console on your nano. When it enters the uboot, hits any key to interrupt it. And then use below command to change the boot order.

# printenv boot_targets
# setenv boot_targets usb0 mmc1 mmc0 nvme0 pxe dhcp
# saveenv
# boot

printenv boot_targets

it says that there is no printenv

Where do you run this command?

serial console in putty bps=115200

now we can not input any word in the console after reboot
why?

This is cboot. Not uboot.

Uboot is after the cboot.

after cboot ,the terminal will stop at “kernel boot fail”
we input nothing
how to entry uboot to do next step?

Can you share the full log?

boot log.txt (17.0 KB)
thx, this is our log.

…This is log from Jetson NX. Do you know that you file a topic on jetson nano forum?

Jetson NX does not have uboot. Just modify the cbo.dtb as the document mentioned to boot from usb disk.

https://docs.nvidia.com/jetson/l4t/index.html#page/Tegra%20Linux%20Driver%20Package%20Development%20Guide/getting_started.html

nano boot log.txt (17.1 KB)
sorry ,
this is our nano boot log.

Your nano is not even able to boot… totally different issue.

Can you flash your nano with sdkm first?

thx.
we flash the image failed with the sdkm (some unknow error)

so we flash a jp4.5 sd card,then let the nano has the feature of maxspi

then we can do the next step now


jp4.5 nano boot log.txt (18.7 KB)

but after we used once jp4.5 ,we can not boot our oldder version jp4.4 sd card any more. this is not happen in xavier nx. can fix this on nano later?

That is different issue. You can file different topic for it.