How to read serial number (serial#) in uboot

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX2
1

Hi.

I want to send serial number to dhcp server.

It is ok to read serial number from eeprom in linux: cat /proc/device-tree/serial-number

I can also do it in uboot interactive console:

fdt addr $fdt_addr
fdt get value serialnum / serial-number

Problem with this approach is that sometimes some kind of race appears and uboot hangs.

Can I know, why nvidias uboot doesn’t set standard serial# environment variable?

5

Hi maxlapshin,

You could use i2c tool to read serial number from eeprom first.

2c dev 3
i2c probe
i2c md 50 0 100 <- CVM
i2c md 57 0 100 <- CVB

We don’t currently parse the serial # and stick it in the DTB in U-Boot

Also, could you share us the log when this hang happens? How is the reproducing rate? I mean how often do you hit this issue?

6

Is this i2c address stable? Is this eeprom inside module or it is on motherboard?

7

If you want the serial number of module, then please read the eeprom on CVM.

8

Ok, thank you.

I thought it would be a good idea to read device tree from memory in uboot, but if you say that it is better to read eeprom, then I will do so.