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How to select board config


We use opensource idbloader(See Boot_option)  on some chips (rk3036, rk3288) and its dmc driver can't support ddr-type autodetct, so the wrong ddr dts settings will make the board failed to enter u-boot.


PMIC setting usually doesn't matter in u-boot,  but for the board with rk818, USB input current should be configured before enter u-boot.


Some board have disable emmc in u-boot for convenience, though the hardware actually have emmc, please note it. (firefly-rk3288)