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As only option to use proper MAC Address (read from hardware MAC Address EEPROM in FSBL or other first stage bootloader) shared memory can be used. This method is supported by TE supplied FSBL hooks code. This MAC Address info is loaded into u-boot using a script - there is no need to patch u-boot source code.

#undef CONFIG_PREBOOT

#define CONFIG_PREBOOT<>"echo U-BOOT for ${hostname} preboot is loading environment from uEnv.txt; set autoexec echo; if mmc rescan; then if fatload mmc

                        "echo importing env from FSBL shared area at 0xFFFFFC00; if itest *0xFFFFFC00 == 0xCAFEBABE; then env import -t 0xFFFFFC04; fi;

Example use of the MAC Address import in u-boot