linuxrc: add depmod call as workaround for missing modules.dep.bb

busybox depmod -b is broken, and busybox modprobe does not seem
to correctly deal with module dependencies.
See bug #472312

defaults/initrd.scripts

@@ -109,6 +109,22 @@ plymouth_newroot() {
 	is_plymouth_started && "${PLYMOUTH_BIN}" --newroot="${1}"
 }
 
+# We should ship the initramfs with modules.dep.bb
+# But current busybox depmod has broken -b support
+# so we can't do that at build time, unless we want
+# to chroot into the initramfs root, which is much more
+# fragile. See bug #472312
+busybox_depmod_workaround() {
+	local depmod_args
+	if [ -n "${DEBUG}" ]
+	then
+		depmod_args="-v"
+	elif [ -n "${QUIET}" ]; then
+		depmod_args="-q"
+	fi
+	depmod ${depmod_args}
+}
+
 modules_load() {
 	for module in $*
 	do

defaults/linuxrc

@@ -310,6 +310,13 @@ mount_devfs
 # Mount sysfs
 mount_sysfs
 
+# We should ship the initramfs with modules.dep.bb
+# But current busybox depmod has broken -b support
+# so we can't do that at build time, unless we want
+# to chroot into the initramfs root, which is much more
+# fragile. See bug #472312
+busybox_depmod_workaround
+
 # Setup hotplugging for firmware loading
 if is_udev
 then