Add USB modules to boot-cd hooks

This should allow the disk to find itself
on external CD-ROM drives.

Signed-off-by: Simo Leone <simo@archlinux.org>

hooks/boot-cd

@@ -1,5 +1,11 @@
 run_hook ()
 {
+    # external drives may need to settle
+    msg ":: Waiting for usb devices to settle..."
+    /sbin/udevtrigger --subsystem-match=usb
+    /sbin/udevsettle
+    sleep 5
+
     msg ":: Scanning for boot cdrom device..."
 
     /bin/mkdir -p /bootmnt

install/boot-cd

@@ -1,6 +1,14 @@
 install ()
 {
     MODULES="cdrom ide-cd ide-core ide-generic unionfs squashfs isofs $(all_modules '/kernel/fs' | grep -v "nls") "
+
+    # need usb modules for external drives
+    MODULES="${MODULES} $(checked_modules "/usb/host" | grep -ve "_cs" -e "sl1811-hcd" -e "isp116x-hcd")"
+    MODULES=$(echo ${MODULES}) #trim whitespace
+    if [ "x${MODULES}" != "x" ]; then
+        MODULES="${MODULES} usb_storage sd_mod sr_mod"
+    fi
+
     BINARIES=""
     FILES=""
     SCRIPT="boot-cd"