[Libreboot] Checksum bits not right for ich9gen generated gbe for x220 t420 t520 series

[qw0ier]

I'm trying to use ich9gen on the thinkpad newer model's (x220 t420 t520) gbe.bin
It seems it can successful decode the gbe.bin and generate the gbe.bin file.
However, the generated checksum bits is not right. Could anyone help on caculate the right checksum for this?

This is the generated mkgbe.c
https://paste.ee/p/tSThG#dziLHzhUTmE65CuhtgtdCZyPTNo37UiF

There are two gbe.bin files both from t520 for compare
https://file.io/Y7WUxc

By the way, it would be good to generate a random mac address during each coreboot process to respect privacy. Could anyone help submit the code to coreboot?

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