Hi Saida
1. seems dp83848 is already integrated on some i.MX6 boards, like fs-net PicoMODA9 board
2. lwip was in i.MX6 SDK, if you previously got it, then one can find it in sdk/lwip directory
(also please find attached this part ).
3. this is defined in uboot/include/configs/ files, #define CONFIG_ENV_IS_IN_FLASH.
For example one can look at mx6sabre_common.h
Best regards
igor
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