rng-tools: Add description, remove unused parameter

* Add description to both Makefile and init script that
  mentions the default of /dev/urandom as the entropy source.
* Remove the deprecated interval parameter from init script.

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>

utils/rng-tools/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=rng-tools
 PKG_VERSION:=5
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=@SF/gkernel/rng-tools/$(PKG_VERSION)/
@@ -30,6 +30,12 @@ define Package/rng-tools
   URL:=http://sourceforge.net/projects/gkernel/
 endef
 
+define Package/rng-tools/description
+Daemon for adding entropy to kernel entropy pool. By default it uses
+/dev/urandom as the source but the init script can be modified
+to use a hardware source like /dev/hwrng if present
+endef
+
 ifdef CONFIG_USE_UCLIBC
 CONFIGURE_VARS += \
     LIBS="-largp"

utils/rng-tools/files/rngd.init

@@ -3,9 +3,9 @@
 
 START=98
 
-RNGD_INTERVAL=30
 RNGD_AMOUNT=4000
 RNGD_DEVICE="/dev/urandom"
+# Use /dev/urandom as source, as hardware sources like /dev/hwrng are usually not present
 
 start() {
 	service_start /sbin/rngd -r $RNGD_DEVICE -W $RNGD_AMOUNT