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How to get the unique id of the cpu of BPI-M2 Ultra/Berry?

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@xiaobo.yang wrote:

My application is based on a33, which has a unique serial number, and now our company want to move it to A40(BPI). My question is how to get the unique serial number in BPI-M2 Ultra/Berry? I tried the command ‘cat /proc/cpuinfo’, but the it outputs ‘Serial : 0000000000000000’ on the last line.

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