I updated one of my Jetson AGX Xavier to JetPack 4.4.1 using
apt update; apt upgrade method. As expected, it updated the
cboot partition to the default.
We usually boot AGX Xavier over NFS for running our test suites every night. The system was setup (before upgrade) to boot over NFS. Looks like cbo.dtb was not upgraded because it still does “net” boot first.
However, since cpu-bootloader partition was upgraded, I have lost the changes made to the cboot to make it work over NFS. So, now I am trying to reflash the
cpu-bootloader partition with the modified cboot_t194.bin file but it’s not taking the effect. Below are the steps I am following, please let me know if it’s correct or needs modification:
1. Copy modified cboot_t194.bin to bootloader/cboot_t194.bin cp bootloader/cboot_t194.bin.NFS bootloader/cboot_t194.bin 2. Create a signed binary using flash.sh script with --no-flash option sudo ./flash.sh --no-flash -r -k cpu-bootloader jetson-xavier mmcblk0p1 3. scp(1) over the bootloader/cboot_t194_sigheader.bin.encrypt to target system scp /home/aaney/nvidia/nvidia_sdk/JetPack_4.4_Linux_JETSON_AGX_XAVIER/Linux_for_Tegra/bootloader/cboot_t194_sigheader.bin.encrypt root@<target>:/tmp 4. Verify `cpu-bootloader` partition number on the system # ls -l /dev/disk/by-partlabel/cpu-bootloader lrwxrwxrwx 1 root root 15 Oct 29 14:22 /dev/disk/by-partlabel/cpu-bootloader -> ../../mmcblk0p6 5. Use dd(1) to flash `cpu-bootloader` partition dd if=/tmp/cboot_t194_sigheader.bin.encrypt of=/dev/mmcblk0p6 6. Reboot the system reboot
The cboot_t194.bin has been updated to look the
jetson.dtb file at cboot/01-MAC-Address-of-system/jetson.dtb on the TFTP server at the
tftpboot directory. I have verified that the cboot_t194.bin has the updated jetson.dtb lookup path. I have also verified that
bootloader/cboot_t194_sigheader.bin.encrypt is also up-to-date.
However, even after successfully dd(1)'ing to the
cpu-bootloader partition the changes didn’t take effects. Please let me know if I am doing something wrong here.