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initramfs-init: add cmdline consoles to inittab

Sometimes a console is specified on the kernel command line but doesn't
get initialized by the kernel because for example the driver is built as
a module. The init should still spawn getty on it.

--- a/initramfs-init.in

+++ b/initramfs-init.in

@@ -106,7 +106,8 @@

 setup_inittab_console(){

 	term=vt100

 	# Inquire the kernel for list of console= devices

-	for tty in $(list_console_devices console); do

+	consoles="$(for c in console $KOPT_consoles; do list_console_devices $c; done)"

+	for tty in $consoles; do

 		# do nothing if inittab already have the tty set up

 		if ! grep -q "^$tty:" $sysroot/etc/inittab; then

 			echo "# enable login on alternative console" \

@@ -340,6 +341,11 @@

 	case "$opt" in

 	s|single|1)

 		SINGLEMODE=yes

+		continue

+		;;

+	console=*)

+		opt="${opt#*=}"

+		KOPT_consoles="${opt%%,*} $KOPT_consoles"

 		continue

 		;;

 	esac