This uses the defaults for jffs/jffs2 properly, when nothing is added to the cli.

expect_uml

@@ -130,11 +130,11 @@ elsif ( $filesystem =~ /^mkfs\.jffs2/ ) {
     my $jffs2_name = "$root_fs_name" . "_jffs2";
     $uml->command("umount /mnt2");
     $uml->command("mount -t hostfs none -o $jffs2_dir /mnt2");
-    if ( $filesystem !~ /^mkfs\.jffs2$/ ) {
-	$uml->command("$filesystem -r /mnt1 -o /mnt2/$jffs2_name");
+    if ( $filesystem =~ /^mkfs\.jffs2\s*$/ ) {
+	$uml->command("mkfs.jffs2 -r /mnt1 -o /mnt2/$jffs2_name  -e 0x20000 -p");
     }
     else {
-	$uml->command("mkfs.jffs2 -r /mnt1 -o /mnt2/$jffs2_name  -e 0x20000 -p");
+	$uml->command("$filesystem -r /mnt1 -o /mnt2/$jffs2_name");
     }
 
 }
@@ -144,23 +144,13 @@ elsif ( $filesystem =~ /^mkfs\.jffs/ ) {
     my $jffs_name = "$root_fs_name" . "_jffs";
     $uml->command("umount /mnt2");
     $uml->command("mount -t hostfs none -o $jffs_dir /mnt2");
-    if ( $filesystem !~ /^mkfs\.jffs$/ ) {
-	$uml->command("$filesystem -d /mnt1 -o /mnt2/$jffs_name");
+    if ( $filesystem =~ /^mkfs\.jffs\s*$/ ) {
+	$uml->command("mkfs.jffs2 -r /mnt1 -o /mnt2/$jffs2_name  -e 0x20000 -p");
     }
-    elsif {
-	$uml->command("mkfs.jffs -d /mnt1 -o /mnt2/$jffs_name  -e 0x20000 -p");
+    else {
+	$uml->command("$filesystem -r /mnt1 -o /mnt2/$jffs2_name");
     }
 }
 
 $uml->command("umount /mnt1; umount /mnt2");   
 $uml->halt();
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