Tegraflash fails to flash SD card for Mender A/B partition scheme

[DomenicP]

Description

Using the ./dosdcard.sh script from the tegraflash bundle fails to create partitions on an SD card with the following error message

$ sudo ./dosdcard.sh /dev/mmcblk0
<tegraflash signing output>
...
About to make an SDcard image on /dev/mmcblk0. OK? yes
Creating partitions
  [01] name=APP start=0 size=63963136 sectors
  [02] name=APP_b start=0 size=63963136 sectors
  [03] name=UDA (fills to end)
ERR: partitioning failed
Could not create partition 2 from 63965184 to 127928319
Could not change partition 2's type code to 8300!
Unable to set partition 2's name to 'APP_b'!
Error encountered; not saving changes.

I traced through the bash scripts and found the sgdisk command that is failing. Creating the first partition is fine, but creating the second and third partition fails.

Details

Reference instructions: https://github.com/OE4T/meta-tegra/wiki/Flashing-the-Jetson-Dev-Kit#writing-an-sdcard meta-tegra branch: kirkstone-l4t-r32.7.x SD card: SanDisk Ultra 64GB Micro SDXC

Attempted the build and flash from two machines:

• Ubuntu 20.04 VirtualBox VM w/ Windows 10 Host
• Ubuntu 24.04 Native Linux

Definition of Done (DoD)

• [ ] Successfully able to flash an SD card

Blockers

None

[DomenicP]

Some theories:

• Testing on a native Linux host lowers my suspicion of VirtualBox hardware pass-through issues
• The card in question is an SDXC card which may cause complications
• Need to test with fdisk and consider patching the tegraflash scripts if fdisk works where sgdisk does not

[DomenicP]

False alarm, GB vs. GiB confusion. The SD card advertised as 64GB is in fact smaller

Disk /dev/sdb: 59.49 GiB, 63864569856 bytes, 124735488 sectors