/proc/cpuinfo misses serial number

VIM4
1

Which system do you use? Android, Ubuntu, OOWOW or others?

Ubuntu

Which version of system do you use? Khadas official images, self built images, or others?

test 5.15 image

Please describe your issue below

it is a minor thing but I see the Serial number is missing from /proc/cpuinfo
(We use it to identify boards in the field)

Post a console log of your issue below:

khadas@testhdmiin:~$ uname -a
Linux testhdmiin 5.15.78 #1.5.2 SMP PREEMPT Thu Sep 28 20:25:26 CST 2023 aarch64 aarch64 aarch64 GNU/Linux
khadas@testhdmiin:~$ cat /proc/cpuinfo | grep Serial
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2

Hello @steely-glint

You can get cpu serical number from /proc/cpu_chipid

$ cat /proc/cpu_chipid 
Serial:          290b100001161b00000537304e424e50
Hardware:        Khadas VIM3
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