[U-Boot] user-space ===>> U-Boot ====>> user-space ?

[bosmith]

Hi
Is there a simple way to send data from a Linux user-space program to
U-Boot?
How about from U-Boot up to a user-space program?

The data may change often enough that using fw_printenv and fw_setenv might
wear out the NAND storage area for the environment.

The use-case is to have two kernel images, two root file systems, and to let
a user-space application specify which to use and then force a reboot.  The
system will not lose power during this reboot.

This seems like a common enough problem.  Has anyone solved it before?

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