Re: Discovering current MTD partition

[Iwo Mergler <IwoM@netcomm.com.au>]

On Thu, 28 Apr 2011 03:14:36 umar@janteq.com wrote:
> > On 04/27/2011 09:25 AM, umar@janteq.com wrote:
> >> Hi,
> >> [...]
> >> What I'd like is to detect from userspace is which /dev/mtdX partition
> >> is
> >> the currently executing program running on because that is the partition
> >> that has been obviously booted.
> > 
> > I think you might want to take a look at getmntent (3) : it is a libc
> > function for getting the /etc/mtab entries. It also seems to be portable.
> > 
> > Cheers,
> > David.
> > 
> > --
> > David Wagner, Free Electrons
> > Kernel, drivers, real-time and embedded Linux
> > development, consulting, training and support.
> > http://free-electrons.com
> 
> This will give me the same info as /proc/mtab.  I cannot figure out how I
> can infer which /dev/mtdXX was booted from with this information.
> 

Here is an example from the embedded system I have on my desk
right now:

root:/proc# cat /proc/mounts
rootfs / rootfs rw 0 0
mtd:rfs / jffs2 rw,relatime 0 0
proc /proc proc rw,relatime 0 0
devpts /dev/pts devpts rw,relatime,mode=600 0 0
etc.

From this we can see that the current root file system is
mtd:rfs

root:/proc# cat mtd
dev:    size   erasesize  name
mtd0: 00100000 00020000 "S1S2EN"
mtd1: 00400000 00020000 "rkern"
mtd2: 00b00000 00020000 "rfs"
mtd3: 00400000 00020000 "kernel"
mtd4: 02000000 00020000 "root"
etc.

This tells us that mtd:rfs corresponds to mtd2, which
should be accessible under /dev/mtd2, /dev/mtdblock2, etc.


Best regards,

Iwo



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