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Too little space to save environment

Since !5 (merged) the uboot env is so crowded that it's not possible anymore to save a custom boot command:

u-boot=> saveenv
Saving Environment to MMC...
Env export buffer too small: 4092, but need 4186
ERROR: Cannot export environment: errno = 12

at common/env_common.c:239/env_export()

I wonder if we can trim that down so it becomes possible again to have a custom boot command to e.g. boot via tftp which is nice for development.

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