RE: [microblaze-uclinux] uclinux boot problem (kernel panic)

[Brettschneider Falk <fbrettschneider@xxxxxxxxxxxxxxxxx>]

Hi,

Sanjay Patel wrote:
> We tried the options & debug solutions given on the following link:
> 
> http://www.ucdot.org/article.pl?sid=03/01/11/1049210&mode=thread.
> 
> We obtain the following log on the hyperterminal:
> 
> Log File:
... 8< ...
> VFS: test name = </dev/root>
> VFS: fs_name = <ext2>
> VFS: fs_name = <romfs>
> VFS: root name <1f:09>
> VFS: tried fs_name = <ext2> err= -6
> 
> VFS: Cannot open root device "" or 1f:09
... 8< ...

> It is not trying to mount the romfs partition. What could be the
> problem? Are there any changes required in any source file? 
> Is there any
> step missing for kernel compilation? Please guide us.
I also had that error.
My first solution was to do an ugly hack in the filesystem probe order
(do_mounts.c) and I moved "romfs" in the string list to be the first one
(see my attached patch).
This prevents the err=-6 thing with ext2. Well, but later I realized I don't
need ext2 at all, and I unchecked it 'make menuconfig'. You know, I just
need romfs and jffs2.

Hope that helps
Cheers, F@lk

Index: do_mounts.c
===================================================================
RCS file: /repository1/uclinux_dist/linux-2.4.x/init/do_mounts.c,v
retrieving revision 1.3
retrieving revision 1.4
diff -u -r1.3 -r1.4
--- do_mounts.c	15 Nov 2005 05:33:35 -0000	1.3
+++ do_mounts.c	16 Mar 2006 10:56:25 -0000	1.4
@@ -324,6 +324,7 @@
 	char *s = page;
 
 	if (root_fs_names) {
+	printk("VFS: *1\n");
 		strcpy(page, root_fs_names);
 		while (*s++) {
 			if (s[-1] == ',')
@@ -349,11 +350,40 @@
 {
 	char *fs_names = __getname();
 	char *p;
+	int i, len;
 
 	get_fs_names(fs_names);
+
+
+        //
+        // HACK to let "romfs" be the first entry (fbr 16/03/2006)
+	//
+        // (move string a bit to the right and copy "romfs" in the new gap)
+	for (p = fs_names; *p; p += strlen(p)+1);
+	len = p-fs_names;
+	i = len + strlen("romfs")+1;
+        while (len >= 0) {
+	    *(fs_names+i) = *(fs_names+len);
+	    i--; len--;
+	}
+	strcpy(fs_names, "romfs");
+	
+#if 0   //---------debug output
+	printk("******\nVFS: test name = <%s> \n", name);
+	printk("VFS: root name <%s> \n******\n", kdevname(ROOT_DEV));
+	for (p = fs_names; *p; p += strlen(p)+1) {
+	  printk("VFS: fs_name = <%s> \n", p);
+	}
+#endif	//---------debug output
+	
 retry:
 	for (p = fs_names; *p; p += strlen(p)+1) {
 		int err = sys_mount(name, "/root", p, flags, root_mount_data);
+		
+#if 0		//debug output
+		printk("VFS: tried fs_name = <%s> err= %d\n",p,err);
+#endif		//debug output
+		
 		switch (err) {
 			case 0:
 				goto out;