[U-Boot] fw_printenv operation and ENVSECTORS

I'm having problems with fw_setenv. The reported error is "End of range reached, aborting".

Looking further into fw_env.c, I see that in flash_write_buf(), ENVSECTORS is used although the README says that this value is not used for NOR devices. It appears to be used here. What value is this supposed to represent?

Thanks, twebb