-SUBSYSTEM=="rtc", DRIVERS=="rtc_cmos", SYMLINK+="rtc"
-KERNEL=="mmtimer", MODE="0644"
-KERNEL=="rflash[0-9]*", MODE="0400"
-KERNEL=="rrom[0-9]*", MODE="0400"
+SUBSYSTEM=="rtc", ATTR{hctosys}=="1", SYMLINK+="rtc"
+KERNEL=="mmtimer", MODE="0644"
+KERNEL=="rflash[0-9]*", MODE="0400"
+KERNEL=="rrom[0-9]*", MODE="0400"
+
+SUBSYSTEM=="firmware", ACTION=="add", IMPORT{builtin}="firmware"