init-functions: enable autoramdisk with 400MB

The 512MB raspberry pi reserve some memory for buffers and gpu
so there are a bit less than 490 MB free.

Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>

config/rootfiles/core/99/filelists/files

@@ -3,6 +3,7 @@ etc/issue
 etc/dracut.conf
 etc/ppp/ip-up
 etc/rc.d/init.d/firewall
+etc/rc.d/init.d/functions
 etc/rc.d/init.d/networking/dhcpcd.exe
 etc/modprobe.d/nf_conntrack.conf
 srv/web/ipfire/cgi-bin/logs.cgi/firewalllog.dat

src/initscripts/init.d/functions

@@ -728,7 +728,7 @@ use_ramdisk() {
 		2)
 			local mem_avail="$(mem_amount)"
 
-			if [ ${mem_avail} -ge 490 ]; then
+			if [ ${mem_avail} -ge 400 ]; then
 				return 0
 			else
 				return 1