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SubjectRe: Can't Mount CF-Card on boot of 2.6.15 Kernel on EPIA - VFS: Cannot open root device
>> > 
>> > I use an EPIA MII6000E motherboard with CF-Card as hard-drive.
>> > Since this device can't boot from CF-Card I boot from network via
>> > PXELINUX.
>> > Works fine for kernel 2.4.25.
>> >
>> > Now I want to change to kernel 2.6.15.4.
>> >
>> > I boot an initrd, execute "linuxrc" and at this point I can mount the
>> > CF-Card
>> > as "hde1", inspect the file-system, ...
>> >
>> Is the proper IDE driver loaded, are you sure the drive is still at hde1
>> with 2.6?
>
> Hmm proper IDE driver...
> 1) I can mount the CF-Card "by hand" and inspect the filesystem. And it looks
> good. I can use the file-system in "near single-user-mode".
> 2) In my "linuxrc" I do the following to load the modules:
> ------------------------- [ BEGIN linuxrc ] -------------------------
> ...
> PCIC="ide_cs yenta_socket pcmcia_core pcmcia rsrc_nonstatic"
> for Module in $PCIC
> do
> modprobe $Module
> done
> lsmod
> ...
> if [ "$DEBUG" != "" ] ; then
> /bin/sh < /dev/console
> fi
> ...
> ------------------------- [ END linuxrc ] -------------------------
> Is this indication enough, that I use the proper IDE driver?

Hm. Maybe http://lkml.org/lkml/2005/2/26/92 (updated version for
2.6.16/.17 below) can help you.

diff --fast -Ndpru linux-2.6.17-rc6~/block/genhd.c linux-2.6.17-rc6+/block/genhd.c
--- linux-2.6.17-rc6~/block/genhd.c 2006-06-06 02:57:02.000000000 +0200
+++ linux-2.6.17-rc6+/block/genhd.c 2006-06-08 22:29:16.607058000 +0200
@@ -214,6 +214,52 @@ struct gendisk *get_gendisk(dev_t dev, i
return kobj ? to_disk(kobj) : NULL;
}

+/*
+ * printk a full list of all partitions - intended for
+ * places where the root filesystem can't be mounted and thus
+ * to give the victim some idea of what went wrong
+ */
+void printk_all_partitions(void)
+{
+ int n;
+ struct gendisk* sgp;
+ mutex_lock(&block_subsys_lock);
+
+ /* For each block device... */
+ list_for_each_entry(sgp,&block_subsys.kset.list, kobj.entry) {
+ char buf[BDEVNAME_SIZE];
+ /* Don't show empty devices or things that have been surpressed */
+ if (get_capacity(sgp) && !(sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)) {
+ /* Note, unlike /proc/partitions I'm showing the numbers in hex
+ in the same format as the root= option */
+ printk("%02x%02x %10llu %s",
+ sgp->major, sgp->first_minor,
+ (unsigned long long)get_capacity(sgp) >> 1,
+ disk_name(sgp, 0, buf));
+ if ((sgp->driverfs_dev) && (sgp->driverfs_dev->driver)) {
+ printk(" driver: %s\n", sgp->driverfs_dev->driver->name);
+ } else {
+ printk(" (driver?)\n");
+ }
+
+ /* now show the partitions */
+ for (n = 0; n < sgp->minors - 1; n++) {
+ if (!sgp->part[n])
+ continue;
+ if (sgp->part[n]->nr_sects == 0)
+ continue;
+ printk(" %02x%02x %10llu %s\n",
+ sgp->major, n + 1 + sgp->first_minor,
+ (unsigned long long)sgp->part[n]->nr_sects >> 1 ,
+ disk_name(sgp, n + 1, buf));
+ } /* partition subloop */
+ } /* Non 0 size, not surpressed */
+ } /* Block device loop */
+
+ mutex_unlock(&block_subsys_lock);
+
+}
+
#ifdef CONFIG_PROC_FS
/* iterator */
static void *part_start(struct seq_file *part, loff_t *pos)
diff --fast -Ndpru linux-2.6.17-rc6~/include/linux/genhd.h linux-2.6.17-rc6+/include/linux/genhd.h
--- linux-2.6.17-rc6~/include/linux/genhd.h 2006-06-06 02:57:02.000000000 +0200
+++ linux-2.6.17-rc6+/include/linux/genhd.h 2006-06-08 22:29:16.607058000 +0200
@@ -401,6 +401,7 @@ char *disk_name (struct gendisk *hd, int
extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
extern void add_partition(struct gendisk *, int, sector_t, sector_t);
extern void delete_partition(struct gendisk *, int);
+extern void printk_all_partitions(void);

extern struct gendisk *alloc_disk_node(int minors, int node_id);
extern struct gendisk *alloc_disk(int minors);
diff --fast -Ndpru linux-2.6.17-rc6~/init/do_mounts.c linux-2.6.17-rc6+/init/do_mounts.c
--- linux-2.6.17-rc6~/init/do_mounts.c 2006-06-06 02:57:02.000000000 +0200
+++ linux-2.6.17-rc6+/init/do_mounts.c 2006-06-08 22:29:16.607058000 +0200
@@ -7,6 +7,7 @@
#include <linux/root_dev.h>
#include <linux/security.h>
#include <linux/delay.h>
+#include <linux/genhd.h>
#include <linux/mount.h>

#include <linux/nfs_fs.h>
@@ -302,15 +303,20 @@ retry:
/*
* Allow the user to distinguish between failed sys_open
* and bad superblock on root device.
+ * and give them a list of the available devices
*/
__bdevname(ROOT_DEV, b);
printk("VFS: Cannot open root device \"%s\" or %s\n",
root_device_name, b);
- printk("Please append a correct \"root=\" boot option\n");
+ printk("Please append a correct \"root=\" boot option; here are the partitions available:\n");

+ printk_all_partitions();
panic("VFS: Unable to mount root fs on %s", b);
}

+ printk("List of all partitions:\n");
+ printk_all_partitions();
+
printk("No filesystem could mount root, tried: ");
for (p = fs_names; *p; p += strlen(p)+1)
printk(" %s", p);
#<<eof>>

Jan Engelhardt
--
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