ENVCTRL_CHAR_ZERO
&unitp->bus_ctl_regs->s0, ENVCTRL_CHAR_ZERO);
chip->val < ENVCTRL_CHAR_ZERO) {
if (chip->val != ENVCTRL_CHAR_ZERO)
} else if ((~backchip.val & 0xFF) != ENVCTRL_CHAR_ZERO) {
unitp->num_fans_failed = ENVCTRL_CHAR_ZERO;