Change boot order on Xavier NX without FS rewrite

Autonomous Machines Jetson & Embedded Systems Jetson Xavier NX
1

Hello.

The Issue is that nvme is above the internal emmc in the boot priority.

So system sometimes tried to boot from nvme, but we don’t want to boot from nvme - we use it simply as storage.

What I tried:

  1. Change boot-order in CBoot console - works fine, but only one-time;
  2. Edit bootloader/cbo.dts, compile it into .dtb and write it via:
    sudo ./flash.sh -k CPUBL-CFG jetson-xavier mmcblk0p1
    but it fails with error:
    [ 6.1848 ] Sending BCTs
    [ 6.1868 ] tegrarcm_v2 --download bct_bootrom br_bct_BR.bct --download bct_mb1 mb1_bct_MB1_sigheader.bct.encrypt --download bct_mem mem_rcm_sigheader.bct.encrypt
    [ 6.1879 ] Applet version 01.00.0000
    [ 6.2595 ] Sending bct_bootrom
    [ 6.2596 ] […] 100%
    [ 6.2607 ] Sending bct_mb1
    [ 6.2657 ] […] 100%
    [ 6.2692 ] Sending bct_mem
    [ 6.3263 ] […] 100%
    [ 6.4440 ]
    Error: Return value 8
    Command tegrarcm_v2 --download bct_bootrom br_bct_BR.bct --download bct_mb1 mb1_bct_MB1_sigheader.bct.encrypt --download bct_mem mem_rcm_sigheader.bct.encrypt
    Failed to flash/read t186ref.

Simple flashing worked fine.

Could you help me please?

Used links:

3

please check the cbo.dts.

https://docs.nvidia.com/jetson/archives/l4t-archived/l4t-3261/index.html#page/Tegra%20Linux%20Driver%20Package%20Development%20Guide/getting_started.html

And only flash to CPUBL-CFG partition.

4

Thanks for response!

I tried it with the default cbo.dts and got this eror:
[ 6.1848 ] Sending BCTs
[ 6.1868 ] tegrarcm_v2 --download bct_bootrom br_bct_BR.bct --download bct_mb1 mb1_bct_MB1_sigheader.bct.encrypt --download bct_mem mem_rcm_sigheader.bct.encrypt
[ 6.1879 ] Applet version 01.00.0000
[ 6.2595 ] Sending bct_bootrom
[ 6.2596 ] […] 100%
[ 6.2607 ] Sending bct_mb1
[ 6.2657 ] […] 100%
[ 6.2692 ] Sending bct_mem
[ 6.3263 ] […] 100%
[ 6.4440 ]
Error: Return value 8
Command tegrarcm_v2 --download bct_bootrom br_bct_BR.bct --download bct_mb1 mb1_bct_MB1_sigheader.bct.encrypt --download bct_mem mem_rcm_sigheader.bct.encrypt
Failed to flash/read t186ref.

Am I using a proper command?
sudo ./flash.sh -k CPUBL-CFG jetson-xavier mmcblk0p1

Also, I use custom dts based on xavier nx devkit, can this be the source of the problem?

5

No, the problem is you use the wrong board config… jetson-xavier is for AGX Xavier.

6

Thanks! I didn’t notice it because I flashed xavier only via sdkmanager…

8

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