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Difference in compilation for DVR and EVM on DM8168

Hi friends!

Please help me, in make file for create VPSS modules for Netra (DM8168) I saw 2 different case: make for DVR and make for EVM board.

When used DVR configuration CFLAGS += -DTI816X_DVR -DENABLE_FB -D_GNU_SOURCE

When used EVM configuration CFLAGS += -DTI816X_EVM

Please, help me, I dont exactly understood these 2 additional flags:

 ENABLE_FB and _GNU_SOURCE.