External MMC only works if plugged after boot! mmcblk0 and mmcblk1 wrong!

[rash.m2k]

Ok guys I have os2008 installed on my N810 on the internal 2GB card. I also have a 4GB minisd card in the external slot.

THe problem is that when start my N810 WITH my external card plugged in then the device boots from mmcblk1p1 - which is actually supposed to be the external memory card! df -h shows that mmcblk1p1 is mapped to root device and mmcblk0p1 is mapped to /media/mmc2.

~ $ df -h
Filesystem Size Used Available Use% Mounted on
/dev/mmcblk0p1 4.0M 2.3M 1.7M 58% /mnt/initfs
none 512.0k 148.0k 364.0k 29% /mnt/initfs/tmp
/dev/mmcblk1p1 1.8G 579.7M 1.2G 32% /
none 512.0k 148.0k 364.0k 29% /tmp
none 1.0M 60.0k 964.0k 6% /dev
tmpfs 1.0M 0 1.0M 0% /dev/shm
/dev/mmcblk0p1 1.8G 579.7M 1.2G 32% /media/mmc2

sfdisk -l however shows the correct mappings.

mmcblk0p1 is internal mmc

mmcblk1p1 as external mmc
/home/user # sfdisk -l

Disk /dev/mmcblk0: 61440 cylinders, 4 heads, 16 sectors/track
Units = cylinders of 32768 bytes, blocks of 1024 bytes, counting from 0

Device Boot Start End #cyls #blocks Id System
/dev/mmcblk0p1 0+ 61439 61440- 1966079+ 83 Linux
/dev/mmcblk0p2 0 - 0 0 0 Empty
/dev/mmcblk0p3 0 - 0 0 0 Empty
/dev/mmcblk0p4 0 - 0 0 0 Empty

Disk /dev/mmcblk1: 124368 cylinders, 4 heads, 16 sectors/track
Units = cylinders of 32768 bytes, blocks of 1024 bytes, counting from 0

Device Boot Start End #cyls #blocks Id System
/dev/mmcblk1p1 0+ 124367 124368- 3979768 b W95 FAT32
/dev/mmcblk1p2 0 - 0 0 0 Empty
/dev/mmcblk1p3 0 - 0 0 0 Empty
/dev/mmcblk1p4 0 - 0 0 0 Empty

The problem I believe lies in the bootmenu.sh file located in the /mnt/initfs folder - the mmc mappings for the N810 are different to N800 somehow.

I can get access to this file and change it but I'm not sure what I should be changing.

I need the N810 to automatically name the internal & external memory as I want to create swap space on the external memory card.

Any help would be much appreciated on how to get these mapping correct.

[fanoush]

Originally Posted by rash.m2k

THe problem is that when start my N810 WITH my external card plugged in then the device boots from mmcblk1p1 - which is actually supposed to be the external memory card!

This is known issue
https://bugs.maemo.org/show_bug.cgi?id=2747

Originally Posted by rash.m2k

The problem I believe lies in the bootmenu.sh file located in the /mnt/initfs folder - the mmc mappings for the N810 are different to N800 somehow.

The problem is in linux kernel. bootmenu.sh just has a workaround for this, you can't fix it there.

Originally Posted by rash.m2k

Any help would be much appreciated on how to get these mapping correct.

Once system boots (udev is used for /dev directory), mapping is consistent and 'correct', /dev/mmcblk1 is always external slot, /dev/mmcblk0 is internal one.

[rash.m2k]

Thanks for your reply fanoush. Its the same bug but the n810 boots correctly with or without memory card inserted. (correct me if I'm wrong)

However when it boots WITH external memory card inserted, the internal memory is mapped to both mmcblk0 and mmcblk1. Unmounting mmcblk0 is possible BUT not mmcblk1 - as it says it's in USE. Also removing the externel mmc in this state causes the N810 to reboot every single time.

By internal memory I mean the internal 2GB card slot on the N810, the internal 256MB flash does not play a part in this.

[fanoush]

Originally Posted by rash.m2k

However when it boots WITH external memory card inserted, the internal memory is mapped to both mmcblk0 and mmcblk1. Unmounting mmcblk0 is possible BUT not mmcblk1 - as it says it's in USE.

well, you unmount mount points not devices, what is the exact command line you are using? Also why you are trying to unmount it? Maybe you can leave it alone?

Originally Posted by rash.m2k

Also removing the externel mmc in this state causes the N810 to reboot every single time.

This can be also related to the fact that you are booting from partition one (mmcblkXp1) not 2 and up. First partition is usually FAT one, maybe system is confused and does something stupid when you open slot door?

[rash.m2k]

Originally Posted by fanoush

well, you unmount mount points not devices, what is the exact command line you are using? Also why you are trying to unmount it? Maybe you can leave it alone?

umount /dev/mmcblk0p1

This can be also related to the fact that you are booting from partition one (mmcblkXp1) not 2 and up. First partition is usually FAT one, maybe system is confused and does something stupid when you open slot door?

I don't really understand whats going on until I read pages and pages of threads. What I do know is that inserting the mmc card AFTER the system has booted works fine.

If I boot the system with the mmc card inside then the internal memory is mounted as internel memory AND as the root device.

I can't explain it very well so ask me any questions you need to figure this out.

[fanoush]

Just FYI, I have fixed this issue, see patch attached to https://bugs.maemo.org/show_bug.cgi?id=2747 After all it was really easy and fits cleanly into kernel structures. Let's hope Nokia applies it to any future diablo updates.

Prebuilt kernel is not currently available due to http://www.internettablettalk.com/fo...676#post229676 :-)

[Bundyo]

So fanoush, to summarize from that bug:

Is the only thing we need to uncomment the first line and comment the second to get consistent mmc names? It works for me, but I if that's the fix - its good to know when cloning n8x0...?

#KERNEL=="mmcblk*", IMPORT{program}="/lib/udev/mmc_id $env{PHYSDEVPATH}" 
KERNEL=="mmcblk*", IMPORT{program}="/lib/udev/mmc_id $sysfs{slot_name}"