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beermad is offline beermad
2011-04-20 , 12:06
Posts: 21 | Thanked: 7 times | Joined on Jul 2010 @ Ipswich, England
#1
Possible?

I seem to have a problem with the MyDocs filesystem, so I'd like to use an SD card instead.

I know I could play around with mountpoints with an upstart script, but it would be infinitely better to somehow persuade the startup to assign and mount it in the first place.
 
iDont is offline iDont
2011-04-20 , 13:23
Posts: 268 | Thanked: 1,053 times | Joined on May 2010 @ The Netherlands
#2
I've been running my device with MyDocs on a uSD card for a few months now. How to do it:

-Make sure the original MyDocs partition won't be mounted at boot by either removing the partition or marking it as being a non-FAT partition by executing:
Code:
sfdisk -c /dev/mmcblk0 26
*26 is a currently unused partition type

-Add below the line containing "-f /usr/lib/genfstab.awk > $tmp_fstab" in /etc/event.d/rcS-late:
Code:
echo "/dev/mmcblk1p1 /home/user/MyDocs vfat $fat_opts 0 0" >> $tmp_fstab
-Add above the line containing "# We can safely continue booting now." in the same file
Code:
/bin/mount /home/user/MyDocs
-Make the last lines of /usr/sbin/osso-usb-mass-storage-enable.sh look like this:
Code:
if [ $# = 1 ]; then
    DEV=/dev/mmcblk1p1
    STR=`cat $LUN0`
    if [ "x$STR" = "x" ]; then
#       echo $1 > $LUN0
        echo $DEV > $LUN0
    else
        echo $1 > $LUN1
    fi
fi

exit 0
-And do the same for the last lines of /usr/sbin/osso-usb-mass-storage-disable.sh
Code:
mount /home/user/MyDocs
exit 0
That should do the trick
Change mmcblk1p1 in the pieces of code to the device name of the FAT partition you want to use as your new MyDocs.

Credits: http://talk.maemo.org/showthread.php...359#post425359
Last edited by iDont; 2011-04-25 at 18:02.
 

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beermad is offline beermad
2011-04-25 , 14:47
Posts: 21 | Thanked: 7 times | Joined on Jul 2010 @ Ipswich, England
#3
Oh sod! I think I killed it.

I don't know what went wrong there, but now my N900 just keeps showing the white "NOKIA" screen, going blank and then repeating itself.

Plugging a USB cable in while it's completely off shows it attaching to the USB port, then almost immediately disconnecting. And repeating itself.

I fear a re-flash is going to be needed :-(
 
iDont is offline iDont
2011-04-25 , 18:02
Posts: 268 | Thanked: 1,053 times | Joined on May 2010 @ The Netherlands
#4
Originally Posted by beermad View Post
I don't know what went wrong there, but now my N900 just keeps showing the white "NOKIA" screen, going blank and then repeating itself.
This can happen when Maemo can't mount /home. I've been thinking what could've gone wrong, and it seems that I've made a very unfortunate error in my post.

Nokia has made Maemo in such a way that it recreates fstab every time it gets booted. The first partition that identifies itself as FAT is used as MyDocs and the first one to identify itself as a Linux native partition is used as /home.

By executing sfdisk -c /dev/mmcblk0 1 83 MyDocs won't get mounted as it identifies itself as not being FAT anymore, but rather as a Linux native partition.
Now Maemo tries to mount it as /home as mmcblk0p1 gets checked earlier than mmcblk0p2. Of course, the content of /home isn't on mmcblk0p1, causing Maemo to get into a reboot loop.

I didn't notice the error as I've partitioned my eMMC differently and changed rcS-late to recreate fstab in a static way.

Originally Posted by beermad View Post
I fear a re-flash is going to be needed :-(
I'm afraid a reflash is required. Flashing only the rootfs should be enough to get your device working again (you won't lose any contact/personal data). Applications will need to be reinstalled probably though.

I've edited my post above to set mmcblk0p1 to a different partition type than 83 to make sure this won't happen to someone else.
 
beermad is offline beermad
2011-04-25 , 18:09
Posts: 21 | Thanked: 7 times | Joined on Jul 2010 @ Ipswich, England
#5
A re-flash was indeed needed. Messy and not fun, but at least I'm (I think) back where I started.

I think I'll wimp out on trying this again and see if I can find another way of achieving what I need (I don't doubt iDont's correction, but cowardice has taken over)...

[edit] Thinking about it, I've got an idea how this could be achieved in a way that shouldn't involve any risk. I'll report back when I've had time to test it out (might take a couple of days, as I've got some website commissions to work on).
Last edited by beermad; 2011-04-26 at 09:15.
 
beermad is offline beermad
2011-04-26 , 15:53
Posts: 21 | Thanked: 7 times | Joined on Jul 2010 @ Ipswich, England
#6
OK, here's a way to achieve this. Admittedly a bit of a cludge, but it has the advantage of failing non-fatally.

One limitation is that it won't work if any processes open any files on either the SD card or MyDocs before it's run, as that will prevent the filesystem from being unmounted. As an upstart script it's probably not great, but it's working for me...

If it fails, it tries to restore the system to as close as possible to its original state (eg, re-mounting the original MyDocs partition).

If you've got processes that need to wait for the new MyDocs partition to be ready (for example my MySQL server, whose data files are on MyDocs) this script emits MYDOCS_REPLACED when it's successfully done its job, so you can change the upstart file's "start on" stanza to:
Code:
start on MYDOCS_REPLACED
Upstart script replaceMyDocs
Code:
description "unmounts normal MyDocs filesystem and replaces it with the SD card"

# Runs afer rcS-late has mounted everything
start on MOUNTS_OK

console none

script

        # Alter the next six lines if necessary for your system
        MYDOCS_DEVICE=/dev/mmcblk0p1
        SD_DEVICE=/dev/mmcblk1p1
        MYDOCS_MOUNTPOINT=/home/user/MyDocs
        MYDOCS_FILESYSTEM=vfat
        SD_MOUNTPOINT=/media/mmc1
        SD_FILESYSTEM=vfat

        # Check that MyDocs hasn't already been replaced
        if [ ! -z "`mount | grep $MYDOCS_MOUNTPOINT | grep $SD_DEVICE`" ]
        then
                # Already mounted.
                normal exit 0
        fi
        # It can take a few seconds for MyDocs to actually mount after rsS-late
        # has finished, so we'll watch for it
        i=0
        while [ -z "`mount | grep $MYDOCS_MOUNTPOINT`" -o -z "`mount | grep $SD_MOUNTPOINT`" ]
        do
                i=$(($i+1))
                if [ $i -eq 120 ]
                then
                        # If it hasn't mounted within two minutes, something's gone
                        # horribly wrong, so we may as well give up
                        normal exit 0
                fi
                sleep 1
        done
        # Get mount options from the fstab file
        OPTS=`grep $MYDOCS_MOUNTPOINT /etc/fstab | awk ' { print $4 } '`

        # Unmount the SD card
        umount $SD_MOUNTPOINT
        # Check it unmouted OK
        if [ $? -eq 0 ]
        then
                # Unmount the MyDocs filesystem
                umount $MYDOCS_MOUNTPOINT
                # Check it unmounted OK
                if [ $? -eq 0 ]
                then
                        # Mount the SD on MyDocs
                        mount $SD_DEVICE -t $SD_FILESYSTEM -o "$OPTS" $MYDOCS_MOUNTPOINT
                        if [ $? -ne 0 ]
                        then
                                # Failed to mount the SD so fall back to original
                                mount $MYDOCS_DEVICE -t $MYDOCS_FILESYSTEM -o "$OPTS" $MYDOCS_MOUNTPOINT
                        else
                                initctl emit MYDOCS_REPLACED
                        fi
                fi
        fi

end script
normal exit 0
 
beermad is offline beermad
2011-05-06 , 15:47
Posts: 21 | Thanked: 7 times | Joined on Jul 2010 @ Ipswich, England
#7
Updated version of upstart script. This allows use of proper Linux filesystems.

Code:
description "unmounts normal MyDocs filesystem and replaces it with the SD card"

# Runs afer rcS-late has mounted everything
start on MOUNTS_OK

console none

script

        MYDOCS_DEVICE=/dev/mmcblk0p1
        SD_DEVICE=/dev/mmcblk1p1
        MYDOCS_MOUNTPOINT=/home/user/MyDocs
        MYDOCS_FILESYSTEM=vfat
        SD_MOUNTPOINT=/media/mmc1
        SD_FILESYSTEM=ext3

        # Check that MyDocs hasn't already been replaced
        if [ ! -z "`mount | grep $MYDOCS_MOUNTPOINT | grep $SD_DEVICE`" ]
        then
                # Already mounted.
                normal exit 0
        fi
        # It can take a few seconds for MyDocs to actually mount after rsS-late
        # has finished, so we'll watch for it
        i=0
        if [ $SD_FILESYSTEM == "vfat" ]
        then
               # The SD will auto-mount if if's vfat, but won't otherwise. So if it's vfat
               # we want to wait until it's been mounted so we don't interrupt
                while [ "`mount | grep $SD_MOUNTPOINT`" ]
                do
                        i=$(($i+1))
                        if [ $i -eq 120 ]
                        then
                                # If it hasn't mounted within two minutes, something's gone
                                # horribly wrong, so we may as well give up
                                normal exit 0
                        fi
                        sleep 1
                done
        fi
        i=0
        while [ -z "`mount | grep $MYDOCS_MOUNTPOINT`" ]
        do
                i=$(($i+1))
                if [ $i -eq 120 ]
                then
                        # If it hasn't mounted within two minutes, something's gone
                        # horribly wrong, so we may as well give up
                        normal exit 0
                fi
                sleep 1
        done
        if [ $SD_FILESYSTEM == "vfat" ]
        then
                # Get mount options from the fstab file
                OPTS=`grep $MYDOCS_MOUNTPOINT /etc/fstab | awk ' { print $4 } '`
        else
                # We don't want the mount options from fstab, as some are invalid for
                # other filesystems.
                OPTS="noauto,nodev,nosuid,noatime,nodiratime"
        fi

        if [ $SD_FILESYSTEM == "vfat" ]
        then
                # Unmount the SD card
                umount $SD_MOUNTPOINT
                # Check it unmouted OK
                if [ $? -ne 0 ]
                then
                        exit
                fi
        fi
        # Unmount the MyDocs filesystem
        umount $MYDOCS_MOUNTPOINT
        # Check it unmounted OK
        if [ $? -eq 0 ]
        then
                # Mount the SD on MyDocs
                mount $SD_DEVICE -t $SD_FILESYSTEM -o "$OPTS" $MYDOCS_MOUNTPOINT
                if [ $? -ne 0 ]
                then
                        # Failed to mount the SD so fall back to original
                        mount $MYDOCS_DEVICE -t $MYDOCS_FILESYSTEM -o "$OPTS" $MYDOCS_MOUNTPOINT
                else
                        initctl emit MYDOCS_REPLACED
                fi
        fi

end script
normal exit 0
 
iceskateclog is offline iceskateclog
2014-06-11 , 12:41
Posts: 58 | Thanked: 134 times | Joined on Dec 2012 @ Vilnius, Lithuania
#8
Any idea how to handle USB Mass Storage mode in elegant way?

Right now I just hack around /usr/sbin/osso-usb-mass-storage-enable.sh and /usr/sbin/osso-usb-mass-storage-disable.sh with umount and mount. My fstab is static

Code:
if [ $# = 1 ]; then
    umount /home/user/MyDocs
    STR=`cat $LUN0`
    if [ "x$STR" = "x" ]; then
       echo $1 > $LUN0
    else
        echo $1 > $LUN1
    fi
fi

exit 0
Code:
mount /home/user/MyDocs
exit 0
A bit different than in post #2, I believe ke-recv changed since then. Without "umount /home/user/MyDocs", my sdcard which is in /dev/mmcblk0p1 (because of SLOT_NUM exchange in /lib/udev/mmc_id) gets mounted on PC and stays mounted on N900 side.

I guess this is something to do with internal and external card name, but can't find where and who is passing what ;]
Last edited by iceskateclog; 2014-06-11 at 12:48.
 
michaaa62 is offline michaaa62
2014-06-11 , 16:33
Posts: 2,101 | Thanked: 1,934 times | Joined on Sep 2008 @ Berlin, Germany
#9
Never tried it, never needed to, but:
Did you try to simply symlink the external card to MyDocs folder?
 
iceskateclog is offline iceskateclog
2014-06-12 , 07:53
Posts: 58 | Thanked: 134 times | Joined on Dec 2012 @ Vilnius, Lithuania
#10
The "problem" is that my eMMC throws I/O errors and I use SDCARD as /home and MyDocs replacement.

/home automatically works correctly with SLOT_NUM /lib/udev/mmc_id trick as /dev/mmcblk0p2, but MyDocs /dev/mmcblk0p1 still gets detected as SDCARD during USB Mass Storage mode. Hence doesn't autounmount from N900
 
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