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[IMX8MM][MYON2] Add fuse_cfg for revision management

Oleksii Kutuzov requested to merge CLEAOS-624-myon-2-automatic-board-revision-management into seco_lf_v2021.04
  • Added fuse_cfg (revision and RAM size are configured based on fuses)
  • Automatically setting the board_rev variable, which chooses the correct revision overlay.
  • Built-in Ethernet disabled by default. Needs to be enabled (if needed for customer projects) by uncommenting the USE_ETHERNET define
Fuses:
 - Boot code: 2 (eMMC)
 - Module code: 2 (Myon)
 - RAM code: 2 (2GB)
 - Revision code: 4 (V2R1)
 - Temp code: 0 (Undefined)
 - IO Voltage code: 0 (Undefined)
Edited by Oleksii Kutuzov

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