[Letux-kernel] How to build LetuxOS Android Kernel for LetuxOS Replicant 4.2?

[Andreas Kemnade]

Hi Nikolaus,

On Thu, 27 Jun 2019 15:59:11 +0200
"H. Nikolaus Schaller" <hns at goldelico.com> wrote:

> Hi,
> maybe some reader here remembers better than me how to build
> the android compatible kernels for LetuxOS Replicant.
> 
> Our LetuxOS Replicant 4.2 image
> 
> 	http://download.goldelico.com/letux-replicant/4.2/  (File: latest-replicant.tbz)
> 

hmm, there is:
http://download.goldelico.com/letux-replicant/4.2/20170423-kernel-4.10-replicant.tbz

You can start analyzing things there.

> can be easily installed on a µSD with
> 
> 	makesd replicant
> 
> and boots successfully with a working kernel that is included.
> 
> But the problem I have is that this is a 3.12 kernel which still expects the
> old NAND format and therefore reports thousands of ECC errors before sometimes
> booting to Replicant. And it does not support the GTA04A5 board (or other boards).
> 
> So I tried to find out how to build a newer kernel for Replicant, but didn't
> find the correct procedures any more.
> 
> We have 4.9.4-android and 4.10-android on
> 
> 	http://projects.goldelico.com/p/gta04-kernel/
> 
> and in theory this should even work with a 5.2-rc6 after merging in the branch
> 
> 	http://git.goldelico.com/?p=letux-kernel.git;a=shortlog;h=refs/heads/letux/android
> 
> Those kernels can boot up to a console but they fail to load the kernel
> modules. Therefore we have no display and no frame buffer and Replicant
> fails to start its applications and permanently reports "init: untracked pid #### exited".
> 
> I remember that kernel module loading was special for Android
> and there is a flat directory /system/lib/modules where a set of .ko
> files is available (maybe from the 3.12 kernel) which is not the
> Linux standard tree structure /lib/modules/$version/kernel/$subsystem/...
> 
> What I also found is that lsmod is empty but it is possible to manually
> modprobe some modules.
> 
> So it looks as if we have to prepare the kernel modules to make them being
> automatically loaded.
> 
> Last time we had looked at Replicant 4.2 for GTA04 is 2-3 years ago...
> 
> Anyone remembers this topic? Any ideas? Any thought? Any hidden knowledge?
> 
here is:

root at android:/ # uname -a
Linux localhost 4.10.5-letux+ #1 SMP PREEMPT Sat Apr 22 22:46:49 CEST
2017 armv7l GNU/Linux

I thought I have created the tarball for that kernel.

Kernel config is attached.

Regards,
Andreas
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