Hello Dear,
I have 7+ years of experience in Embedded Linux and used fw_printenv & fw_setenv binaries on many SoC platforms on TI, Freescale and Qualcomm. Recently I build this u-boot utility with Freescale's Imx6 quad SoC.
So I can do it for you. Let me know if you are interested.
Let's discuss more over Skype if you are interested.
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Thanks,
ALM