[U-Boot] [fw_printenv should open device as O_SYNC]

Hi all,

We have hit the following issue in a board with 2 flash banks.

First I set some env variable in U-boot, using fw_setenv, then immediately I switch the banks. But as the buffers have not yet been flushed to the mtd driver, the bank switching leaves the flash in corrupted state.

I ve modified the fw_env.c file to open the mtd O_SYNC and it works fine.

If it is OK I can submit a patch for this.

Regards,

Ivan