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

[Andreas Kemnade]

On Sun, 30 Jun 2019 10:55:52 +0200
"H. Nikolaus Schaller" <hns at goldelico.com> wrote:

> Hi,
> I am now able to build letux-4.14.129-replicant, patch it over the replicant 4.2 image and get the display working.
> To make it work automatically, it needs some modifications to the load_modules.sh to get omapdss and the tvout up and running.
> 
> Charging with 500mA is now working out of the box :)
> 
> Libertas WiFi firmware also loads. The main mistake was a misinterpretation of the message
> 
> [  341.977203] libertas_sdio mmc1:0001:1: Direct firmware load for libertas/sd8686_v8_helper.bin failed with error -2
> 
> This will always come since the firmware loader is trying in sequence:
> 
> 	sd8686_v9_helper.bin
> 	sd8686_v8_helper.bin
> 	sd8686_helper.bin
> 
> So a successful load of sd8686_helper.bin is not reported!
> 
> If I rename sd8686_helper.bin -> sd8686_v8_helper.bin it will still report that two variants do fail.
> 
> Still, moving the Settings/Wi-Fi switch to ON makes it snap back immediately without any console activity.
> 
hmm, on the gta04a5 it seems to work. Just tried with my replicant 4.2.
hmm, there was some suspend issue with libertas wifi I guess. Must
check if that kernel is ok.

> As a next step I'll try to add the missing module loading to the kernel tree...
> This might need to maintain the /system/load_modules.sh script within the kernel branch.
> Which seems to be a good idea since it must track kernel changes.

there is also the devicetree stuff which is in the android side. 
> 
> There are also other drivers renamed, e.g. bmp085 -> bmp280 etc.
> 
... which happens rarely.

> So bringing that into a publishable shape is the next step.
> 
I think having the standard build process spitting out something useful
is most important. Being able to quickly exchange kernel modules is
something nice.

Regards,
Andreas