Hi Charles, Thank you. It works by your way. I had already tried "root=1f:01" and it didn't work, and then I spent whole day to test it... :-( It seems that "root=1f01" and "root=31:01" are both acceptable. Thanks and regards, Colin ----- Original Message ----- From: "Charles Eidsness" <charles.eidsness@xxxxxxxx> To: "colin" <colin@xxxxxxxxxxxxxx> Cc: <linux-mips@xxxxxxxxxxxxxx> Sent: Wednesday, October 20, 2004 10:19 PM Subject: Re: Strange! Cannot use JFFS2 as root > Hi Colin, > > I had a similar problem. You're passing root=/dev/mtdblock1 which has a > major value of 31 and a minor value of 1 but the by the looks of the > error message the kernel thinks you want to boot from a device with a > major number of 2 and a minor number of zero. You could try passing an > explicitly defined root=1F01 instead (major 31, minor 1). This works for > me. I have no idea why the kernel doesn't recognize the text based > declaration and haven't had time to investigate. Maybe someone else has > a better idea than I do. > > Hope that helps, > Charles > > colin wrote: > > Hi all, > > I had booted up Linux with nfs root, and write a JFFS2 image to /dev/mtd1. > > Here is my cmdline for Kernel: > > go 0x80305018 root=/dev/nfs rw nfsroot=172.19.26.145:/nfs/rootfs > > ip=172.19.27.193::172.19.27.254:255.255.254.0::: > > mtdparts=maltaflash:1536k(ldr),2048k(root) > > > > After writing the JFFS2 image to /dev/mtd1, I can mount /dev/mtdblcok1 to > > some directory. > > mount -t jffs2 /dev/mtdblock1 /mnt > > > > Next, I hope to boot up Linux with JFFS2 root, and try to give this cmdline > > to Kernel: > > go 0x80305018 rootfstype=jffs2 > > mtdparts=maltaflash:1536k(ldr),2048k(root) root=/dev/mtdblock1 > > > > and the Kernel would complain me about no root: > > VFS: Unable to mount root fs via NFS, trying floppy. > > Kernel panic: VFS: Unable to mount root fs on unknown-block(2,0) > > > > I traced the code and found that when passing "/dev/mtdblock1" to > > name_to_dev_t() in do_mounts.c, it would return 0 at every try_name(), > > which will fail at open() with the path "/sys/block/%s/dev". > > > > What's the problem? Could anyone tell me? > > > > Thanks and regards, > > Colin > > > > > > > > > > > >
