[Info/brainstorming] Compiling modules for the 2.6.32 beta kernel OBSOLETE

kabaldan · Oct 17, 2010

This thread is now obsolete.
Kernel sources for build 5.26.0 have been released:
https://opensource.motorola.com/sf/go/projects.milestone/frs.milestone_source_froyo

I've pushed some new pre-compiled modules to github, though beware, I haven't had time to test all of them on device yet:
https://github.com/nadlabak/android...mmit/b300803348705d3fc5ce76d8c88d57186748a370

As the kernel sources are not yet available from the Motorola's open source project, here is an outline how I compiled the overclock and cpufreq governor modules. (Btw., the overclock module needed a substantial adaptation, see the source here: http://android.doshaska.net/2.6.32oc )

I'm using the sources from this AOSP repo:

Code:

git clone git://android.git.kernel.org/kernel/omap.git
git checkout --track -b android-omap-2.6.32 origin/android-omap-2.6.32

Use the sholes config:

Code:

make sholes_defconfig

flags that need to be disabled:

CONFIG_LOCALVERSION_AUTO
CONFIG_MODVERSIONS
CONFIG_DEBUG_MUTEXES
CONFIG_SCHEDSTATS
CONFIG_SCHED_DEBUG

[updated on 17.01.2011, thanks go to Skrilax_CZ]
At least the ext2 will work without panics when compiled using this config.

For tun, cifs and nfs there is still some additional config mismatch that prevents the modules to work without null pointer dereference oops.

Also, even when no custom kernel module is used, you can get the kernel panic very easily, try to enable wifi and do:

Code:

cat /proc/kallsyms

If you're interested in a more detailed android kernel compilation guide, you can e.g. roughly follow this Droid kernel guide: http://www.droidforums.net/forum/rescue-squad-guides/31452-how-compile-your-own-kernel.html

leobg · Oct 18, 2010

Thanks for starting this thread kabaldan! It is a great starting point in tackling the issue of adding tun support to the new kernel (tun.ko module). I am not as good as many others in this, but trying won't hurt. Meanwhile if someone else is working on tun support - share experience here!

xphp · Oct 18, 2010

If kernel seems to be ok, sometimes mounting with new version of busybox won't work.
I used to get kernel panic when use newer version of busybox (not Android kernel but my own embedded linux)

petyo.tsanov · Oct 19, 2010

Hey Nadlabak can you add DLNA function of CM6?

yantz · Oct 22, 2010

same problem using droidx kernel sources. insmod ok, mount reboots the phone

yantz

leobg · Oct 22, 2010

I tried droid2 kernel module - doesn't work either

I noticed OpenVPN included in CM6 also relies on this kernel module. Hence doesn't work. I guess we won't (ever) see kernel sources for that leaked kernel we are now using. I assume Motorola will release the sources sooner or later, but not before official Froyo layout. The waiting is killing me! kabaldan, can't you try to do some magic as you did with the overclock module? The beer is from me!!!

kabaldan · Oct 22, 2010

Can you test this attached tun.ko?
Insmod is OK, but I currently don't have time for any further tests...
EDIT: don't bother, kernel panic as usual

leobg · Oct 23, 2010

Module loads fine, but when attempt to use it, phone reboots, just like with the module compiled from DroidX sources..

SophT · Oct 28, 2010

leobg said:
Module loads fine, but when attempt to use it, phone reboots, just like with the module compiled from DroidX sources..

So, I got it loaded - insmod works just great, just like it did on the 2.1 kernel.

I'm trying to use the CM6 built-in OVPN settings, but I can't find any documentation on the setup. How did you get it set up?

I have

/sdcard/openvpn/

cert.crt
ca.crt
config.conf
config.ovpn
pem.key

I realize that config.conf and config.ovpn are the same file- but I use this VPN on windows and on Mac, and I wasn't sure the requirements on Linux.

If I can't find some documentation I'll try downloading the OpenVPN settings app from the market and playing with that.

Also, I don't know if it's true or not, but I heard the Milestone2 source compiled driver could work.

leobg · Oct 28, 2010

Are you trying the module kabaldan provided? It doesn't seem to work, at least for me. Loads fine, but phone crashes when setting up tun interface. I couldn't get OpenVPN in CM6 0.3 to work so far. I am testing the tun.ko with the cisco vpn package (which worked great on the old kernel with CM6 0.2) vpnc. When I initiate the connection, phone reboots if the attached here tun.ko is used. I also tried with tun.ko compiled from DroidX sources - same thing - phone reboots. I am not sure where did kabaldan take/compile this module from.

Sent from my Milestone using Tapatalk

SophT · Oct 29, 2010

I was using the same one, I was thinking maybe he could use the info from more than one phone. I'll try get-a-robot or OpenVPN Installer, but I won't hold my breathe. I was just hoping to use the built-in functionality of the ROM.

*edit* Just saw he removed it because it doesn't work yet, oh well.

yantz · Oct 29, 2010

the kernel doesnt seem to like any other fs not built into it. i've tried several, ext2, ext3, ext4, cifs, jffs, reiserfs etc. all modules would load without a problem but system will reboot during mount. heck i even tried creating logical volume on the partition. volume created fine, but when time to mount, it reboot

i ended up using a 2nd vfat partition for apps2vfat, on top of native froyo move to sd. moved my debian arm there and manually, yes manually, replace many symlinks in libs to copied files

hopefully next froyo release for other regions would provide a different kernel

yantz

SophT · Dec 12, 2010

hey kabaldan wondering if you've had another chance to look at an updated tun.ko

kabaldan · Jan 16, 2011

Finally some breakthrough. The great Skrilax_CZ has made some hard debugging and one very good guess:

CONFIG_DEBUG_MUTEXES must be disabled in the kernel config.

At least the ext2 module compiled this way is working without panics now.

Congrats to Skrilax!

EDIT: Tun nor nfs not tested yet..., cifs unfortunately still not working.

rcbadiale · Jan 16, 2011

kabaldan said:
Finally some breakthrough. The great Skrilax_CZ has made some hard debugging and one very good guess:

CONFIG_DEBUG_MUTEXES must be disabled in the kernel config.

At least the ext2 module compiled this way is working without panics now.

Congrats to Skrilax!

EDIT: Tun nor nfs not tested yet..., cifs unfortunately still not working.

This means that now the app2ext work?

Where are the modules for we test?!

Thanks for the news!

kabaldan · Jan 16, 2011

Modules for testing:
ext2 - http://code.google.com/p/cyanogenmod4milestone/issues/detail?id=197#c19
tun - http://code.google.com/p/cyanogenmod4milestone/issues/detail?id=222#c4

mohitrocks · Jan 16, 2011

Hi sort of a newbie here... So does this mean that data2ext will work?

Sent from my Milestone using XDA App

edowar · Jan 16, 2011

Hi Nadlabak...maybe you already know.
For the cifs module, how about slow-work is made available as a module.
as is done at this link
http://xdaforums.com/showpost.php?p=9271775&postcount=4

kabaldan · Jan 16, 2011

after further testing:
ext2 mounting now works, reading from ext2 partition too, but writing still causes panic
tun causes panic too

Let's hope for a soon kernel source release, as it looks like we won't get much further without it.

edowar: thanks for the link

alncool · Jan 16, 2011

@kabaldan

Could it be possible to create a swap module for milestone ?
It seems that running kernels does not have this feature yet and i'm not sure motorola to implement it for next 2.2 release so .... well just wondering !

[Info/brainstorming] Compiling modules for the 2.6.32 beta kernel OBSOLETE

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