Changing APPSIZE leads to tegraflash errors

Robotics & Edge Computing Jetson & Embedded Systems Jetson Xavier NX
1

Hello,

I’ve seen similar topics on this matter exchange but didn’t provide a solution that worked for me.
I had successfully set up a dual bank rootfs on Xavier NX eMMC devkit (16GB). I had changed the rootfs partition size to 6G and added a data partition of 2G. This XML worked with L4T 32.6.1.

I’m trying to upgrade to L4T 35.1 to benefit from the 5.10 kernel. However, I noticed that the base xml has changed (flash_l4t_t194_spi_emmc_p3668_rootfs_ab.xml). I tried to modify it with my rootfs size and new data partition but tegraflash was not working. I isolated the changes and noticed that the new rootfs size alone was problematic.

The isolated problem is the following.
I’m using:

  • flash_l4t_t194_spi_emmc_p3668_rootfs_ab.xml
  • APPSIZE = 6441402368 (6GB) (No problem with 7516192768 (7GB))
    tegradevflash_v2 is stuck when it tries to flash the APP partition at 0%. Meanwhile, the Xavier NX console displays the following error message:
[0338.604] I> Writing cpu-bootloader_b partition.
[0380.377] I> Writing bootloader-dtb_b partition.
[0384.912] I> Writing VER_b partition.
[0384.921] I> Writing VER partition.
[0384.930] I> Writing device 1: 3.
[0384.938] I> Writing APP partition.
[0384.974] E> NV3P_SERVER: Could not write 1048576 bytes.

Could you provide me with assistance on this matter?

Best Regards.

3

Hi,

Could you test with EMMC_CFG=flash_l4t_t194_spi_emmc_p3668.xml first? Also, share the command you are using in flash.sh.

4

Thanks for your reply.

I encounter the same error with flash_l4t_t194_spi_emmc_p3668.xml along with APPSIZE=6442450944.

For flashing, I use a custom Yocto distribution which makes use of meta-tegra. It calls the script tegra194-flash-helper.sh with the following arguments:

MACHINE=custom-xavier ./tegra194-flash-helper.sh  flash.xml.in custom-xavier.dtb tegra194-mb1-bct-memcfg-p3668-0001-a00.cfg,tegra194-memcfg-sw-override.cfg 0xB8190000 boot.img custom-dbg-image.ext4 "$@"

The issue arrives when the following tegradevflash command is called:

tegradevflash_v2 --pt flash.xml.bin --create
5

Sorry that we have no experience with Yocto tool. Please try to reproduce your error with flash.sh and share your steps.

7

I’ve resolved my problem.
More info on the associated Issue on github/meta-tegra

8

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