[U-Boot] why does only zynqmp check GD_FLG_ENV_DEFAULT?

another curiosity, if i might ... notice:

$ grep -r GD_FLG_ENV_DEFAULT * board/xilinx/zynqmp/zynqmp.c: if (!(gd->flags & GD_FLG_ENV_DEFAULT)) { common/env_common.c: gd->flags |= GD_FLG_ENV_DEFAULT; include/asm-generic/global_data.h:#define GD_FLG_ENV_DEFAULT 0x02000 /* Default variable flag */ $

it seems a bit odd that there is a u-boot-wide global data flag that is tested by only a single board. what exactly does that flag represent?

rday