How to use STM32H7's UID(96bits) to generate 3 bytes for Mac address?

[HarryXia]

I need generate ethernet Mac address for my devices(STM32H7xx), and want to make those devices' Mac address NOT same. The first 3 byte of Mac address will use ST's, so only leave 3 bytes. 

We want to use the chip UID to generate the 3 bytes of the Mac address. What is the best way for us to generate them? 

I dont know what is the meaning of 3 parts(HAL_GetUIDw0/1/2) of UID, I found most parts of our chip's UID are same, just a few chars are different, dont know if we can ignore some of UID which are almost not changed. 

[Tesla DeLorean]

ST is not providing you with 16 million MAC addresses, you'll need to BUY and serialize your own.

There's wafer batch, and die X / Y position data. There's not really any guarantee you can shrink the 96-bit UID into a 24-bit one.

[HarryXia]

so HAL_GetUIDw0 of UID is wafer batch, right?

[Tesla DeLorean]

I'm not sure of the exact mappings, I think there was a White Paper at one point, and other posts to the forum.