gen_setcurrdev
int gen_setcurrdev(struct env_var *ev, int flags, const void *value);
env_setenv("currdev", EV_VOLATILE, devname, gen_setcurrdev,
env_setenv("currdev", EV_VOLATILE, "", gen_setcurrdev, env_nounset);
env_setenv("currdev", EV_VOLATILE, "", gen_setcurrdev,
env_setenv("currdev", EV_VOLATILE, boot_devname, gen_setcurrdev,
gen_setcurrdev, env_nounset);
env_setenv("currdev", EV_VOLATILE, "", gen_setcurrdev, env_nounset);
env_setenv("currdev", EV_VOLATILE, bargv[0], gen_setcurrdev,
gen_setcurrdev, env_nounset);
env_setenv("currdev", EV_VOLATILE, "", gen_setcurrdev, env_nounset);