[Ubi] Wrong major:minor

[Gilles]

On Sun, 29 May 2011 11:54:36 -0400, Mike Frysinger
<vapier.adi at gmail.com> wrote:
>they're most likely dynamic and there's no safe way you could create
>the nodes ahead of time with a device table.  simply run mdev to take
>care of /dev for you.
>
>you can check /proc/devices to be sure ... anything over 250 is dynamic

Thanks for the infos.

I rebuilt uClinux with Busybox's mdev and added an rc.d script +
symlink. The dev nodes are created, but /dev/ubi0 is missing:
============
>  ubinfo /dev/ubi0 -a
libubi: error!: cannot get information about "/dev/ubi0"
        error 2 (No such file or directory)
ubinfo: error!: unrecognized device node "/dev/ubi0"
============

Here's what I did:

1. make config_menuconfig
    
    Miscellaneous Configuration
        Device Nodes (Dynamic)
    
    BusyBox
    [*] mdev
    [*]   Support /etc/mdev.conf
    [ ]     Support subdirs/symlinks (NEW)
    [ ]     Support command execution at device addition/removal (NEW)
    [ ]   Support loading of firmwares (NEW)

2. vi /usr/src/uClinux-dist-2010R1-RC5/vendors/Rowetel/IP04/mdev
    
    #!/bin/sh
    # Start up file for mdev
    
    case $1 in
            start) echo "Starting mdev...";
            #BAD echo /sbin/mdev > /proc/sys/kernel/hotplug;
            /sbin/mdev -s;
            ;; 
    
            stop) killall -9 mdev;;
            enable) rm -f /etc/rc.d/S20mdev; 
            ln -s /etc/init.d/mdev /etc/rc.d/S20mdev;;
            disable) rm -f /etc/rc.d/S20mdev;;
    
            *) cat <<EOF;;
    
    Syntax: /etc/init.d/mdev [command]
    Available commands:
            start   Start the service
            stop    Stop the service
            enable  Enable service autostart
            disable Disable service autostart
    EOF
    esac

3. vi /usr/src/uClinux-dist-2010R1-RC5/vendors/Rowetel/IP04/Makefile
    
    #Added
    $(ROMFSINST) /etc/init.d/mdev
    $(ROMFSINST) -s /etc/init.d/mdev /etc/rc.d/S20mdev

After rebooting, here are the relevant items in /dev:

crw-rw----    1 root     root       90,   0 Dec 31 16:00 mtd0
crw-rw----    1 root     root       90,   1 Dec 31 16:00 mtd0ro
crw-rw----    1 root     root       90,   2 Dec 31 16:00 mtd1
crw-rw----    1 root     root       90,   3 Dec 31 16:00 mtd1ro
crw-rw----    1 root     root       90,   4 Dec 31 16:00 mtd2
crw-rw----    1 root     root       90,   5 Dec 31 16:00 mtd2ro
brw-rw----    1 root     root       31,   0 Dec 31 16:00 mtdblock0
brw-rw----    1 root     root       31,   1 Dec 31 16:00 mtdblock1
brw-rw----    1 root     root       31,   2 Dec 31 16:00 mtdblock2
crw-rw----    1 root     root       10,  63 Dec 31 16:00 ubi_ctrl

>  cat /proc/mtd
dev:    size   erasesize  name
mtd0: 00800000 00001000 "ROMfs"
mtd1: 00800000 00020000 "linux kernel(nand)"
mtd2: 0f800000 00020000 "file system(nand)"

Any idea why mdev doesn't create /dev/ubi0?

Thanks.