Backup nano production emmc (JN30)

Autonomous Machines Jetson & Embedded Systems Jetson Nano
1

Hi,

I’m desperately trying to create an image backup of my jetson nano production module mounted on a JN30 carrier board using:

./flash.sh -r -k APP -G backup.img jetson-nano-emmc mmcblk0p1

Unfortunately it keeps hanging on this part:

...
[   0.1311 ] 
[   0.1311 ] Get Signed section of bct
[   0.1317 ] tegrabct --bct P3448_A00_4GB_Micron_4GB_lpddr4_204Mhz_P987.bct --chip 0x21 0 --listbct bct_list.xml
[   0.1324 ] 
[   0.1325 ] Signing BCT
[   0.1337 ] tegrasign --key None --list bct_list.xml --pubkeyhash pub_key.key
[   0.1344 ] Assuming zero filled SBK key
[   0.1350 ] 
[   0.1351 ] Updating BCT with signature
[   0.1362 ] tegrabct --bct P3448_A00_4GB_Micron_4GB_lpddr4_204Mhz_P987.bct --chip 0x21 0 --updatesig bct_list_signed.xml
[   0.1380 ] 
[   0.1381 ] Sending BCTs
[   0.1392 ] tegrarcm --download bct P3448_A00_4GB_Micron_4GB_lpddr4_204Mhz_P987.bct
[   0.1400 ] Applet version 00.01.0000
[   0.1540 ] Sending bct
[   0.1541 ] [................................................] 100%
[   0.2269 ] 
[   0.2270 ] Retrieving storage infomation
[   0.2305 ] tegrarcm --oem platformdetails storage storage_info.bin
[   0.2330 ] Applet version 00.01.0000
[   0.2491 ] 00000004: Failed to get an accessor of secondary boot device
[   0.2502 ] 
[   0.2547 ] tegradevflash --oem platformdetails storage storage_info.bin

Anyone knows what’s wrong? I was able to flash the board properly, using l4t r32.2.1.

2

hello Error323,

it’s a known issue that image backup functionality not working with l4t-r32.2.1
you may check discussion threads, such as Topic 1065012, and Topic 1064479 as see-also.

you could have an alternative way to use dd commands to clone APP partition,
therefore, you should replace it with $OUT/Linux_for_Tegra/bootloader/system.img.

you’ll still need local machine to perform script to flash the other Nano boards.
please also do remember to add “-r” commands, which skip building and reuse existing system.img.
thanks

3

Hi JerryChang,

Thank you for your answer. Does this imply that for higher versions of l4t it does work properly?

4

hello Error323,

it’s a regression for image backup functionality starting from l4t-r32.x
we’re not yet root cause the failure and it’s still under investigation.
please working with dd commands to clone APP partition as your temporary approach.
thanks