AGX Orin: ROOTFS_AB=1 - support for UDA partition

Autonomous Machines Jetson & Embedded Systems Jetson AGX Orin
1

I flashed Orin with ROOTFS_AB=1. There A and B partitions came asymetric and there is no UDA partition:

root@orin:~# gdisk -l /dev/mmcblk0
GPT fdisk (gdisk) version 1.0.5

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.
Disk /dev/mmcblk0: 124321792 sectors, 59.3 GiB
Sector size (logical/physical): 512/512 bytes
Disk identifier (GUID): 202E73F0-83C8-465F-8400-1A008A8C6502
Partition table holds up to 128 entries
Main partition table begins at sector 2 and ends at sector 33
First usable sector is 40, last usable sector is 124321752
Partitions will be aligned on 8-sector boundaries
Total free space is 24 sectors (12.0 KiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1         3050048        59673151   27.0 GiB    0700  APP
   2        59673152       124321752   30.8 GiB    0700  APP_b
   3              40          262183   128.0 MiB   0700  A_kernel
   4          262184          263719   768.0 KiB   0700  A_kernel-dtb
   5          263720          328487   31.6 MiB    0700  A_reserved_on_user
   6          328488          590631   128.0 MiB   0700  B_kernel
   7          590632          592167   768.0 KiB   0700  B_kernel-dtb
   8          592168          656935   31.6 MiB    0700  B_reserved_on_user
   9          656936          820775   80.0 MiB    0700  recovery
  10          820776          821799   512.0 KiB   0700  recovery-dtb
  11          821800          952871   64.0 MiB    EF00  esp
  12          952872         3050023   1024.0 MiB  0700  reserved

Is there a way to enable/configure the UDA partition (e.g.shrink APP_b to the size of APP and and add UDA)? I would like to have configuration similar to Xavier, which is:

Number  Start (sector)    End (sector)  Size       Code  Name
   1              40        29360167   14.0 GiB    0700  APP
   2        29360168        58720295   14.0 GiB    0700  APP_b
. . .
  42        60204288        61079518   427.4 MiB   0700  UDA
3

hello Agtonomy,

please check flash configuration file, such as flash_t234_qspi_sdmmc_rootfs_ab.xml. it doesn’t include UDA partition definition.
for testing, you may modify the xml file to include the partition.

4

I have edited this file, added UDA and ended up with this:

Number  Start (sector)    End (sector)  Size       Code  Name
   1         3050048        59673151   27.0 GiB    0700  APP
   2        59673152       116296255   27.0 GiB    0700  APP_b
   3              40          262183   128.0 MiB   0700  A_kernel
   4          262184          263719   768.0 KiB   0700  A_kernel-dtb
   5          263720          328487   31.6 MiB    0700  A_reserved_on_user
   6          328488          590631   128.0 MiB   0700  B_kernel
   7          590632          592167   768.0 KiB   0700  B_kernel-dtb
   8          592168          656935   31.6 MiB    0700  B_reserved_on_user
   9          656936          820775   80.0 MiB    0700  recovery
  10          820776          821799   512.0 KiB   0700  recovery-dtb
  11          821800          952871   64.0 MiB    EF00  esp
  12          952872         3050023   1024.0 MiB  0700  reserved
  13       116296256       124321758   3.8 GiB     0700  UDA

I don’t have confidence in all the options - I copied most from Xavier.

I am curious why the APP partitions on Xavier are at the physical beginning of the device, while on Orin at the end. Does it matter?

5

hello Agtonomy,

please check you have define "secondary_gpt" in last.
besides, why don’t you based-on flash_t234_qspi_sdmmc_rootfs_ab.xml to add a new partition for testing?

6

Yes, I have this at the end:

       . . . 
        <partition name="UDA" id="13" type="data">
            <allocation_policy> sequential </allocation_policy>
            <filesystem_type> basic </filesystem_type>
            <file_system_attribute> 0 </file_system_attribute>
            <allocation_attribute> 0x808 </allocation_attribute>
            <percent_reserved> 0 </percent_reserved>
            <align_boundary> 4096 </align_boundary>
            <description> **Required.** Automatically takes all remaining space on the device except space
              occupied by `secondary_gpt`. Allocation attribute must be set to 0x808. This
              partition may be mounted and used to store user data. </description>
        </partition>
        <partition name="secondary_gpt" type="secondary_gpt">
            <allocation_policy> sequential </allocation_policy>
            <filesystem_type> basic </filesystem_type>
            <size> 0xFFFFFFFFFFFFFFFF </size>
            <file_system_attribute> 0 </file_system_attribute>
            <allocation_attribute> 8 </allocation_attribute>
            <percent_reserved> 0 </percent_reserved>
        </partition>
    </device>
</partition_layout>

I had to explicitly specify id=13, otherwise I had errors.

8

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