[Gta04-owner] Building replicant - Winter 2017

[Andreas Kemnade]

Hi,

On Tue, 26 Dec 2017 21:13:09 +0100
Josua Mayer <josua.mayer97 at gmail.com> wrote:

> Good evening everybody,
> 
> Due to the holidays I had some freetime to spend on my GTA04 again. So I 
> chose to investigate building replicant-6 and booting it.
> So following the iReplicant-6 build instructions at [0], I managed to 
> build the replicant-6.0-dev branch of replicant and boot it (not to GUI).
> 
> Turns out that, as Andreas mentioned a while ago, surfaceflinger dies.
> I tracked that down to a missing hwcomposer library, that surfaceflinger 
> tries to load:
> 01-01 00:00:08.424  1399  1399 I SurfaceFlinger: SurfaceFlinger is starting
> 01-01 00:00:08.454  1399  1399 I SurfaceFlinger: SurfaceFlinger's main 
> thread ready to run. Initializing graphics H/W...
> 01-01 00:00:08.455  1399  1399 D libEGL  : Emulator without GPU support 
> detected. Fallback to software renderer.
> 01-01 00:00:08.506  1399  1399 D libEGL  : loaded 
> /system/lib/egl/libGLES_android.so
> 01-01 00:00:08.698  1399  1399 E SurfaceFlinger: hwcomposer module not found
> 
> A quick search revealed that there is a generic hwcomposer 
> implementation based on DRM, called drm_hwcomposer.
> After enabling, and rebuilding, a new error popped up that I can't seem 
> to figure out:
How did you enable it?

> 01-01 00:00:12.555  1535  1535 I SurfaceFlinger: SurfaceFlinger is starting
> 01-01 00:00:12.559  1535  1535 I SurfaceFlinger: SurfaceFlinger's main 
> thread ready to run. Initializing graphics H/W...
> 01-01 00:00:12.560  1535  1535 D libEGL  : Emulator without GPU support 
> detected. Fallback to software renderer.
> 01-01 00:00:12.597  1535  1535 D libEGL  : loaded 
> /system/lib/egl/libGLES_android.so
> 01-01 00:00:12.773  1535  1535 E hwc-drm-resources: Failed to open dri- 
> Unknown error -2
> 01-01 00:00:12.773  1535  1535 E hwcomposer-drm: Can't initialize Drm 
> object -19
> 01-01 00:00:12.773  1535  1535 E SurfaceFlinger: composer device failed 
> to initialize (No such device)
> 01-01 00:00:12.773  1535  1535 E SurfaceFlinger: ERROR: failed to open 
> framebuffer (No such file or directory), aborting
> 
> At the heart of this error sits drm_hwcomposer, which tries to open 
> /dev/dri/card0.
> Sure enough, a quick ls on /dev confirmed that it does *not* exist.
> 
> Any ideas why that is?
> The latest LetuxOS does have this file.
> 
> What I checked:
> ueventd is properly configured to create /dev/dri/*, *if* the kernel 
> notifies it about the presence of such device. See ueventd.rc: 
> /dev/dri/* 0666 root graphics
> 
> Please find a boot-log attached.
> 

Most interesting line:
01-01 00:00:26.424  1404  1404 I load_modules.sh: /system/load_modules.sh[205]: modprobe: not found

I guess the drm related modules are not loaded. Perhaps we do not
need the hwcomposer-drm then.
If they are loaded: Try to manually create /dev/dri/*

Btw: you should try to use the same kernel + modules as I used for
replicant 4.2, they contain important fixes (e.g. Audio routing)

Maybe those folks who had a running gui at OHSW 2016 find time to do a
dump of /dev/brain and filter out the relevant patches...

Regards,
Andreas
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