[Buildroot] /dev mounted additionally at /mnt

Dennis Borgmann dennis.borgmann at googlemail.com
Mon Oct 25 14:23:08 UTC 2010

Hello Paulius!

Thank you for this FAST help. The problem was really inside inittab. I
would never have checked that file. The following line does not belong

null::sysinit:/bin/mount -o remount,rw /

I commented it out and everything is the way it should be. Only question
is, why did it get into that file ever at all?

Thank you a whole lot!


Paulius Zaleckas schrieb:
> On Mon, Oct 25, 2010 at 4:36 PM, Dennis Borgmann
> <dennis.borgmann at googlemail.com> wrote:
>> Hello buildroot-list!
>> I am using buildroot-2010.08 on an at91sam9g20. Everything is really
>> nice, but if I boot my device, it mounts the whole root-filesystem under
>> '/mnt' , although its contents rather seem to be related to the
>> '/dev'-directory. See the output of 'mount',  'ls /mnt' and 'cat
>> /etc/fstab' at the end of this mail. The '/etc/fstab' does not contain a
>> hint about why this may be this way.
>> Any ideas?
>> Kind regards,
>> Dennis
>> [root /]# mount
>> rootfs on / type rootfs (rw)
>> /dev/root on / type ext2 (rw,relatime)
>> proc on /proc type proc (rw,relatime)
>> devpts on /dev/pts type devpts (rw,relatime,gid=5,mode=620,ptmxmode=000)
>> tmpfs on /tmp type tmpfs (rw,relatime)
>> sysfs on /sys type sysfs (rw,relatime)
>> /dev/root on /mnt type ext2 (rw,relatime)
>> [root /]# ls /mnt
>> admmidi0    dsp0        i2c-0       ptyp5       sdb6        ttySAC0
>> admmidi1    dsp1        i2c-1       ptyp6       sdb7        ttySAC1
>> admmidi2    dsp2        i2c-2       ptyp7       sdb8        ttySAC2
>> admmidi3    dsp3        i2c-3       ptyp8       sdb9        ttySAC3
>> adsp@       fb0         input/      ptyp9       sequencer   ttyUL0
>> adsp0       fb1         kmem        ram         sequencer2@ ttyUL1
>> adsp1       fb2         loop0       ram0        shm/        ttyUL2
>> adsp2       fb3         loop1       ram1        snd/        ttyUL3
>> adsp3       hda         mem         ram2        sndstat     ttymxc0
>> aloadC0     hda1        midi@       ram3        tty         ttymxc1
>> aloadC1     hda10       midi00      random      tty0        ttymxc2
>> aloadC2     hda11       midi01      rtc         tty1        ttyp0
>> aloadC3     hda12       midi02      sda         tty2        ttyp1
>> aloadSEQ    hda13       midi03      sda1        tty3        ttyp2
>> amidi@      hda14       mixer@      sda10       tty4        ttyp3
>> amidi0      hda2        mixer0      sda11       tty5        ttyp4
>> amidi1      hda3        mixer1      sda12       tty6        ttyp5
>> amidi2      hda4        mixer2      sda13       tty7        ttyp6
>> amidi3      hda5        mixer3      sda14       ttyAMA0     ttyp7
>> amixer0     hda6        mtd0        sda2        ttyAMA1     ttyp8
>> amixer1     hda7        mtd1        sda3        ttyAMA2     ttyp9
>> amixer2     hda8        mtd2        sda4        ttyAMA3     uba
>> amixer3     hda9        mtd3        sda5        ttyCPM0     uba1
>> audio@      hdb         mtdblock0   sda6        ttyCPM1     uba2
>> audio0      hdb1        mtdblock1   sda7        ttyCPM2     uba3
>> audio1      hdb10       mtdblock2   sda8        ttyCPM3     uba4
>> audio2      hdb11       mtdblock3   sda9        ttyP0       uba5
>> audio3      hdb12       music       sdb         ttyP1       ubb
>> console     hdb13       net/        sdb1        ttyP2       ubb1
>> dmfm0       hdb14       null        sdb10       ttyP3       ubb2
>> dmfm1       hdb2        psaux       sdb11       ttyPSC0     ubb3
>> dmfm2       hdb3        ptmx        sdb12       ttyPSC1     ubb4
>> dmfm3       hdb4        pts/        sdb13       ttyPSC2     ubb5
>> dmmidi0     hdb5        ptyp0       sdb14       ttyPSC3     urandom
>> dmmidi1     hdb6        ptyp1       sdb2        ttyS0       zero
>> dmmidi2     hdb7        ptyp2       sdb3        ttyS1
>> dmmidi3     hdb8        ptyp3       sdb4        ttyS2
>> dsp@        hdb9        ptyp4       sdb5        ttyS3
>> [root /]# cat /etc/fstab
>> # /etc/fstab: static file system information.
>> #
>> # <file system> <mount pt>      <type>
>> <options>                               <dump> <pass>
>> /dev/root                       /                       ext2
>> rw,noauto                               0               1
>> proc                            /proc           proc
>> defaults                                        0               0
>> devpts                  /dev/pts                devpts
>> defaults,gid=5,mode=620 0               0
>> tmpfs                   /tmp                    tmpfs
>> defaults                                        0               0
>> sysfs                   /sys                    sysfs
>> defaults                                        0               0
> Look at /etc/inittab it does some mounting already
> and after cleaning fstab all should be OK

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