# Need debugging help with DirectFB + LEDE

**URL:** <https://forum.openwrt.org/t/need-debugging-help-with-directfb-lede/19985>\
**Category:** Installing and Using OpenWrt\
**Created:** [August 26, 2018, 9:19pm UTC](https://forum.openwrt.org/t/need-debugging-help-with-directfb-lede/19985 "2018-08-26T21:19:36Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![maxgerhardt](https://forum.openwrt.org/letter_avatar/maxgerhardt/32/5_5575768a8748004e209b776fc1b2916d.png) [@maxgerhardt](https://forum.openwrt.org/u/maxgerhardt)\
**Post date:** [August 26, 2018, 9:19pm UTC](https://forum.openwrt.org/t/need-debugging-help-with-directfb-lede/19985/1 "2018-08-26T21:19:36Z")

</div>

I'm working with an Omega2+ (580MHz MIPS CPU, 128MB DDR2 RAM, running LEDE 17.01) on integrating [DirectFB](https://github.com/deniskropp/DirectFB) on top an already working `fbdev`. The goal is to get a working media player (`dfbplay`..).

I'm writing this here because this is LEDE/OpenWrt related and there are probably a few embedded developers here who may have done similiar stuff. The DirectFB support website is dead and issues on their github haven't received comments from the developers in years.

`fbdev` support was compiled in through a modified kernel build detailed in (link see below). This is working fine and I can write programs interacting with `/dev/fb0`, which is in turn an ILI9341 320x240 SPI display.

```
insmod /root/modules/fbtft_device.ko custom name="fb_ili9341" busnum=32766 cs=1 speed=96666000 mode=0x06 fps=100 txbuflen=3145728 buswidth=8 bgr=1 gpios=reset:2,dc:3 width=240 height=320 verbose=3 rotate=90 debug=2 #$((1<<5))

```

![IMG_20180826_222924](https://forum.openwrt.org/uploads/default/original/2X/3/30e1fe366ac55ff1d30e7389f26080cc659d706d.jpeg)

Since I couldn't find a `Makefile` for OpenWRT/LEDE which uses the most recent DirectFB source, I cross-compiled DirectFB with the `OnionIoT/source` toolchain and the following `configure` call:

```
./configure --host=mipsel-openwrt-linux --disable-osx --disable-x11 --enable-debug-support --disable-network \ 
--disable-mmx --disable-sse --enable-fbdev --disable-sdl --disable-vnc --with-inputdrivers=linuxinput --with-gfxdrivers=none \
--disable-wayland --disable-egl-united --disable-png --disable-x11 --disable-video4linux --disable-x11vdpau \
--without-tools --prefix="/home/max/DirectFB/install_dir/" --exec-prefix="/home/max/DirectFB/install_dir/" \
--disable-multi --disable-multicore --enable-debug --with-tests

```

I couldn't compile the vanilla source on the gcc-musl toolchain, so I had to apply patches fixing code related to `sigval_t` and mutexes (no `PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP` on musl). The applied patches are [here](https://patchwork.ozlabs.org/patch/542045/).

This made DirectFB compile, however unfunctional. Executing any of the programs or tests results in the program hanging up. I then have to kill it with `Ctrl+C`.

My `.directfbrx` is

```
root@Omega-C465:~# cat .directfbrc
system=fbdev
module-dir=/usr/lib/directfb-1.8-0/
fbdev=/dev/fb0
mode=320x240
depth=16
pixelformat=RGB16
fatal-level=NONE
debug
no-hardware

```

The output of the program is, with debug enabled:

```
root@Omega-C465:~# ./dfbshow logo.bmp
DirectFB::Init() okay
(-) [(null) 7197.160,223] ( 3176) Direct/Trace: load_symbols( (null) )
(-) [(null) 7197.161,129] ( 3176) Direct/Trace: not running 'nm -nC /root/dfbshow', enable via 'nm-for-trace' option
(-) [(null) 7197.161,864] ( 3176) Direct/Main: direct_initialize() called... (from (null))
(-) [dfbshow 7197.162,587] ( 3176) Direct/Main: ...first reference, initializing now.
(-) [dfbshow 7197.163,248] ( 3176) Direct/Signals: Initializing...
(-) [dfbshow 7197.163,997] ( 3176) Direct/Thread: direct_thread_create( CRITICAL, 0x77057304(0), 'SigHandler' )
(-) [dfbshow 7197.164,721] ( 3176) Direct/Thread/Init: -> locking...
(-) [dfbshow 7197.165,394] ( 3176) Direct/Thread/Init: -> creating handle...
(-) [dfbshow 7197.166,060] ( 3176) Direct/Thread/Init: -> OTHER (-20) [0;0]
(-) [dfbshow 7197.166,811] ( 3176) Direct/Thread/Init: -> waiting...
(-) [SigHandler 7197.167,280] ( 3178) Direct/Thread/Init: direct_thread_main( 0x7708d518 )
(-) [SigHandler 7197.167,704] ( 3178) Direct/Thread/Init: -> starting...
(-) [SigHandler 7197.168,808] ( 3178) Direct/Thread/Init: -> tid 3178
(-) [SigHandler 7197.169,313] ( 3178) Direct/Signals: Blocking all signals from now on!
(-) [SigHandler 7197.169,688] ( 3178) Direct/Thread/Init: -> locking...
(-) [SigHandler 7197.170,830] ( 3178) Direct/Thread/Init: -> signalling...
(-) [SigHandler 7197.171,364] ( 3178) Direct/Thread/Init: -> unlocking...
(*) Direct/Thread: Started 'SigHandler' (3178) [CRITICAL - OTHER/0] <85288>...
(-) [dfbshow 7197.171,839] ( 3176) Direct/Thread/Init: -> ...thread is running.
(-) [dfbshow 7197.171,902] ( 3176) Direct/Thread/Init: -> unlocking...
(-) [dfbshow 7197.171,951] ( 3176) Direct/Thread/Init: -> returning 0x7708d518

   ~~~~~~~~~~~~~~~~~~~~~~~~~~| DirectFB 1.8.0 |~~~~~~~~~~~~~~~~~~~~~~~~~~
        (c) 2012-2015 DirectFB integrated media GmbH
        (c) 2001-2015 The world wide DirectFB Open Source Community
        (c) 2000-2004 Convergence (integrated media) GmbH
      ----------------------------------------------------------------

(-) [dfbshow 7197.172,123] ( 3176) IDirectFB: IDirectFB_Construct( 0x77090f08 )
(-) [dfbshow 7197.172,187] ( 3176) DirectFB/Core: dfb_core_create...
(-) [dfbshow 7197.172,255] ( 3176) Direct/Trace: load_symbols( (null) )
(-) [dfbshow 7197.172,441] ( 3176) Direct/Trace: not running 'nm -nC /root/dfbshow', enable via 'nm-for-trace' option
(-) [dfbshow 7197.172,543] ( 3176) Direct/Main: direct_initialize() called... (from (null))
(-) [dfbshow 7197.172,596] ( 3176) Direct/Main: ...2 references now.
(*) DirectFB/Core: Single Application Core. (2018-08-19 18:44) [DEBUG]
(-) [dfbshow 7197.172,790] ( 3176) Core/System: 0x774c9040()
(-) [dfbshow 7197.172,854] ( 3176) Direct/Modules: direct_modules_explore_directory( 'systems' )
(-) [dfbshow 7197.173,013] ( 3176) Direct/Modules: lookup_by_file()
(-) [dfbshow 7197.173,082] ( 3176) Direct/Modules: -> allocated entry 0x7708d5c8
(-) [dfbshow 7197.173,148] ( 3176) Direct/Modules: open_module()
(-) [dfbshow 7197.173,199] ( 3176) Direct/Modules: open_module( 0x7708d5c8 'libdirectfb_devmem.so', 0 refs )
(-) [dfbshow 7197.173,273] ( 3176) Direct/Modules: Loading '/usr/lib/directfb-1.8-0//systems/libdirectfb_devmem.so'...
(-) [dfbshow 7197.174,118] ( 3176) Direct/Modules: Registering 'devmem' ('systems')...
(-) [dfbshow 7197.174,275] ( 3176) Direct/Modules: ...registered as 0x7708d5c8
(-) [dfbshow 7197.174,338] ( 3176) Direct/Modules: -> dlopen returned 0x76e54840
(-) [dfbshow 7197.174,397] ( 3176) Direct/Modules: lookup_by_file()
(-) [dfbshow 7197.174,457] ( 3176) Direct/Modules: -> allocated entry 0x417058
(-) [dfbshow 7197.174,517] ( 3176) Direct/Modules: open_module()
(-) [dfbshow 7197.174,566] ( 3176) Direct/Modules: open_module( 0x417058 'libdirectfb_dummy.so', 0 refs )
(-) [dfbshow 7197.174,640] ( 3176) Direct/Modules: Loading '/usr/lib/directfb-1.8-0//systems/libdirectfb_dummy.so'...
(-) [dfbshow 7197.175,475] ( 3176) Direct/Modules: Registering 'dummy' ('systems')...
(-) [dfbshow 7197.175,635] ( 3176) Direct/Modules: ...registered as 0x417058
(-) [dfbshow 7197.175,698] ( 3176) Direct/Modules: -> dlopen returned 0x76e54930
(-) [dfbshow 7197.175,759] ( 3176) Direct/Modules: lookup_by_file()
(-) [dfbshow 7197.175,818] ( 3176) Direct/Modules: -> allocated entry 0x76e54a68
(-) [dfbshow 7197.176,312] ( 3176) Direct/Modules: open_module()
(-) [dfbshow 7197.176,403] ( 3176) Direct/Modules: open_module( 0x76e54a68 'libdirectfb_fbdev.so', 0 refs )
(-) [dfbshow 7197.176,528] ( 3176) Direct/Modules: Loading '/usr/lib/directfb-1.8-0//systems/libdirectfb_fbdev.so'...
(-) [dfbshow 7197.178,604] ( 3176) Direct/Modules: Registering 'fbdev' ('systems')...
(-) [dfbshow 7197.178,773] ( 3176) Direct/Modules: ...registered as 0x76e54a68
(-) [dfbshow 7197.178,833] ( 3176) Direct/Modules: -> dlopen returned 0x76fee640
(-) [dfbshow 7197.178,925] ( 3176) Core/System: module 0x76e54a68
(-) [dfbshow 7197.178,981] ( 3176) Core/System: name 'fbdev'
(-) [dfbshow 7197.179,032] ( 3176) Core/System: refs 0
(-) [dfbshow 7197.179,084] ( 3176) Core/System: loaded 1
(-) [dfbshow 7197.179,135] ( 3176) Core/System: disabled 0
(-) [dfbshow 7197.179,187] ( 3176) Core/System: dynamic 1
(-) [dfbshow 7197.179,237] ( 3176) Core/System: file 'libdirectfb_fbdev.so'
(-) [dfbshow 7197.179,292] ( 3176) Direct/Modules: direct_module_ref( 0x76e54a68 'fbdev', 0 refs, loaded 1, dynamic 1, disabled 0 )
(-) [dfbshow 7197.179,484] ( 3176) Direct/Modules: -> refs 1, funcs 0x76de7438
(-) [dfbshow 7197.179,545] ( 3176) Core/System: module 0x417058
(-) [dfbshow 7197.179,594] ( 3176) Core/System: name 'dummy'
(-) [dfbshow 7197.179,647] ( 3176) Core/System: refs 0
(-) [dfbshow 7197.179,697] ( 3176) Core/System: loaded 1
(-) [dfbshow 7197.179,748] ( 3176) Core/System: disabled 0
(-) [dfbshow 7197.179,799] ( 3176) Core/System: dynamic 1
(-) [dfbshow 7197.179,849] ( 3176) Core/System: file 'libdirectfb_dummy.so'
(-) [dfbshow 7197.179,903] ( 3176) Direct/Modules: direct_module_ref( 0x417058 'dummy', 0 refs, loaded 1, dynamic 1, disabled 0 )
(-) [SigHandler 7197.183,829] ( 3178) Direct/Thread/Init: -> running...
(-) [SigHandler 7197.184,012] ( 3178) Direct/Signals: handle_signals() -> waiting for a signal...
(-) [dfbshow 7197.179,971] ( 3176) Direct/Modules: -> refs 1, funcs 0x76dfe484
(-) [dfbshow 7197.185,501] ( 3176) Direct/Modules: direct_module_unref( 0x417058 'dummy', 1 refs, loaded 1, dynamic 1, disabled 0 )
(-) [dfbshow 7197.186,221] ( 3176) Direct/Modules: unload_module()
(-) [dfbshow 7197.186,915] ( 3176) Direct/Modules: unload_module( 0x417058 'libdirectfb_dummy.so', 0 refs )
(-) [dfbshow 7197.187,361] ( 3176) Core/System: module 0x7708d5c8
(-) [dfbshow 7197.187,728] ( 3176) Core/System: name 'devmem'
(-) [dfbshow 7197.188,080] ( 3176) Core/System: refs 0
(-) [dfbshow 7197.188,416] ( 3176) Core/System: loaded 1
(-) [dfbshow 7197.188,857] ( 3176) Core/System: disabled 0
(-) [dfbshow 7197.189,199] ( 3176) Core/System: dynamic 1
(-) [dfbshow 7197.189,541] ( 3176) Core/System: file 'libdirectfb_devmem.so'
(-) [dfbshow 7197.189,898] ( 3176) Direct/Modules: direct_module_ref( 0x7708d5c8 'devmem', 0 refs, loaded 1, dynamic 1, disabled 0 )
(-) [dfbshow 7197.190,438] ( 3176) Direct/Modules: -> refs 1, funcs 0x76e1b628
(-) [dfbshow 7197.190,816] ( 3176) Direct/Modules: direct_module_unref( 0x7708d5c8 'devmem', 1 refs, loaded 1, dynamic 1, disabled 0 )
(-) [dfbshow 7197.191,219] ( 3176) Direct/Modules: unload_module()
(-) [dfbshow 7197.191,335] ( 3176) Direct/Modules: unload_module( 0x7708d5c8 'libdirectfb_devmem.so', 0 refs )
(-) [dfbshow 7197.191,795] ( 3176) Direct/Trace: load_symbols( (null) )
(-) [dfbshow 7197.192,071] ( 3176) Direct/Trace: not running 'nm -nC /root/dfbshow', enable via 'nm-for-trace' option
(-) [dfbshow 7197.192,478] ( 3176) Direct/Main: direct_initialize() called... (from (null))
(-) [dfbshow 7197.193,014] ( 3176) Direct/Main: ...3 references now.
(-) [dfbshow 7197.193,183] ( 3176) Fusion/Skirmish: fusion_skirmish_init( 0x76e54034, 'Fusion Arenas' )
(-) [dfbshow 7197.193,296] ( 3176) Direct/Thread: direct_thread_create( MESSAGING, 0x7709f4c0(0x76fee7d8), 'Fusion Dispatch' )
(-) [dfbshow 7197.193,800] ( 3176) Direct/Thread/Init: -> locking...
(-) [dfbshow 7197.193,924] ( 3176) Direct/Thread/Init: -> creating handle...
(-) [dfbshow 7197.194,004] ( 3176) Direct/Thread/Init: -> OTHER (-15) [0;0]
(-) [dfbshow 7197.194,286] ( 3176) Direct/Thread/Init: -> waiting...
(-) [Fusion Dispatch 7197.194,858] ( 3179) Direct/Thread/Init: direct_thread_main( 0x76e546a8 )
(-) [Fusion Dispatch 7197.195,291] ( 3179) Direct/Thread/Init: -> starting...
(-) [Fusion Dispatch 7197.195,644] ( 3179) Direct/Thread/Init: -> tid 3179
(-) [Fusion Dispatch 7197.195,990] ( 3179) Direct/Signals: Blocking all signals from now on!
(-) [Fusion Dispatch 7197.196,354] ( 3179) Direct/Thread/Init: -> locking...
(-) [Fusion Dispatch 7197.196,712] ( 3179) Direct/Thread/Init: -> signalling...
(-) [Fusion Dispatch 7197.197,205] ( 3179) Direct/Thread/Init: -> unlocking...
(*) Direct/Thread: Started 'Fusion Dispatch' (3179) [MESSAGING - OTHER/0] <85288>...
(-) [dfbshow 7197.197,688] ( 3176) Direct/Thread/Init: -> ...thread is running.
(-) [dfbshow 7197.197,749] ( 3176) Direct/Thread/Init: -> unlocking...
(-) [dfbshow 7197.197,798] ( 3176) Direct/Thread/Init: -> returning 0x76e546a8
(-) [dfbshow 7197.197,855] ( 3176) Direct/Signals: Adding handler 0x7728d7d8 for signal -1 with context 0x76fee738...
(-) [dfbshow 7197.197,947] ( 3176) DirectFB/Core: Initializing...
(-) [dfbshow 7197.198,076] ( 3176) DirectFB/Core: ICore_Real::Initialize()
(-) [dfbshow 7197.198,183] ( 3176) Fusion/Object: fusion_object_pool_create( 'GraphicsState Pool' )
(-) [dfbshow 7197.198,256] ( 3176) Fusion/Skirmish: fusion_skirmish_init( 0x76feec18, 'GraphicsState Pool' )
(-) [dfbshow 7197.198,363] ( 3176) Fusion/Object: fusion_object_pool_create( 'Layer Context Pool' )
(-) [dfbshow 7197.198,436] ( 3176) Fusion/Skirmish: fusion_skirmish_init( 0x76feed48, 'Layer Context Pool' )
(-) [dfbshow 7197.198,527] ( 3176) Fusion/Object: fusion_object_pool_create( 'Layer Region Pool' )
(-) [dfbshow 7197.198,599] ( 3176) Fusion/Skirmish: fusion_skirmish_init( 0x76feee78, 'Layer Region Pool' )
(-) [dfbshow 7197.198,695] ( 3176) Fusion/Object: fusion_object_pool_create( 'Palette Pool' )
(-) [dfbshow 7197.198,770] ( 3176) Fusion/Skirmish: fusion_skirmish_init( 0x4173b8, 'Palette Pool' )
(-) [dfbshow 7197.198,862] ( 3176) Fusion/Object: fusion_object_pool_create( 'Surface Pool' )
(-) [dfbshow 7197.198,934] ( 3176) Fusion/Skirmish: fusion_skirmish_init( 0x4174a8, 'Surface Pool' )
(-) [dfbshow 7197.199,023] ( 3176) Fusion/Object: fusion_object_pool_create( 'Surface Allocation Pool' )
(-) [dfbshow 7197.199,097] ( 3176) Fusion/Skirmish: fusion_skirmish_init( 0x4175b8, 'Surface Allocation Pool' )
(-) [dfbshow 7197.199,181] ( 3176) Fusion/Object: fusion_object_pool_create( 'Surface Buffer Pool' )
(-) [dfbshow 7197.199,248] ( 3176) Fusion/Skirmish: fusion_skirmish_init( 0x4176e8, 'Surface Buffer Pool' )
(-) [dfbshow 7197.199,338] ( 3176) Fusion/Object: fusion_object_pool_create( 'Surface Client Pool' )
(-) [dfbshow 7197.199,410] ( 3176) Fusion/Skirmish: fusion_skirmish_init( 0x417818, 'Surface Client Pool' )
(-) [dfbshow 7197.199,495] ( 3176) Fusion/Object: fusion_object_pool_create( 'Window Pool' )
(-) [dfbshow 7197.199,562] ( 3176) Fusion/Skirmish: fusion_skirmish_init( 0x417948, 'Window Pool' )
(-) [dfbshow 7197.199,646] ( 3176) DirectFB/Task: TaskManager_Initialise()
(-) [dfbshow 7197.199,702] ( 3176) DirectFB/Task: TaskManager::Initialise()
(-) [dfbshow 7197.199,764] ( 3176) Core/Parts: Going to initialize 'clipboard_core' core...
(-) [dfbshow 7197.199,831] ( 3176) Core/Clipboard: dfb_clipboard_core_initialize( 0x76fee738, 0x417a68, 0x417a80 )
(-) [dfbshow 7197.199,898] ( 3176) Fusion/Skirmish: fusion_skirmish_init( 0x417a84, 'Clipboard Core' )
(-) [dfbshow 7197.199,964] ( 3176) DirectFB/Core: core_arena_add_shared_field( 'clipboard_core' -> 0x417a80 )
(-) [dfbshow 7197.202,723] ( 3176) Core/Parts: Going to initialize 'colorhash_core' core...
(-) [dfbshow 7197.202,853] ( 3176) Core/ColorHash: dfb_colorhash_core_initialize( 0x76fee738, 0x417b88, 0x417bc0 )
(-) [dfbshow 7197.203,059] ( 3176) DirectFB/Core: core_arena_add_shared_field( 'colorhash_core' -> 0x417bc0 )
(-) [dfbshow 7197.203,202] ( 3176) Core/Parts: Going to initialize 'surface_core' core...
(-) [dfbshow 7197.203,324] ( 3176) Core/SurfaceCore: dfb_surface_core_initialize( 0x76fee738, 0xb92c08, 0xb92c20 )
(-) [dfbshow 7197.203,443] ( 3176) Core/SurfacePool: dfb_surface_pool_initialize2( 0x7751844c )
(-) [dfbshow 7197.203,589] ( 3176) Core/SurfacePool: init_pool( 0xb92c40, 0x7751844c )
(-) [dfbshow 7197.203,720] ( 3176) Fusion/Skirmish: fusion_skirmish_init( 0xb92c44, 'System Memory' )
(-) [dfbshow 7197.203,848] ( 3176) Core/SurfacePool: => [0] 0xb92c40 - 'System Memory' [0] (0), 0x7751844c
(-) [dfbshow 7197.203,972] ( 3176) Core/SurfacePool: dfb_surface_pool_initialize2( 0x7751849c )
(-) [dfbshow 7197.204,088] ( 3176) Core/SurfacePool: init_pool( 0xb92dc0, 0x7751849c )
(-) [Fusion Dispatch 7197.202,584] ( 3179) Direct/Thread/Init: -> running...
(-) [Fusion Dispatch 7197.204,234] ( 3179) Fusion/Main/Dispatch: event_dispatcher_loop() running...
(-) [dfbshow 7197.204,908] ( 3176) Core/PreAlloc: preallocInitPool()
(-) [dfbshow 7197.205,005] ( 3176) Fusion/Skirmish: fusion_skirmish_init( 0xb92dc4, 'Preallocated Memory' )
(-) [dfbshow 7197.205,161] ( 3176) Core/SurfacePool: -> [0] 0xb92c40 - 'System Memory' [0] (0), 0x7751844c
(-) [dfbshow 7197.206,305] ( 3176) Core/SurfacePool: => [1] 0xb92dc0 - 'Preallocated Memory' [1] (0), 0x7751849c
(-) [dfbshow 7197.206,457] ( 3176) Core/SurfPoolBridge: dfb_surface_pool_bridge_initialize( 0x775184ec, 0xb92c08 )
(-) [dfbshow 7197.206,568] ( 3176) Core/SurfPoolBridge: init_bridge( 0xb92f40, 0x775184ec )
(-) [dfbshow 7197.206,672] ( 3176) Core/PreAlloc/Bridge: preallocInitPoolBridge()
(-) [dfbshow 7197.206,756] ( 3176) Fusion/Skirmish: fusion_skirmish_init( 0xb92f44, 'PreAlloc Pool Bridge' )
(-) [dfbshow 7197.206,859] ( 3176) Core/SurfPoolBridge: => [0] 0xb92f40 - 'PreAlloc Pool Bridge' [0] (0), 0x775184ec
(-) [dfbshow 7197.206,966] ( 3176) Direct/Signals: Adding handler 0x77337a64 for signal -2 with context 0xb92c08...
(-) [dfbshow 7197.207,074] ( 3176) DirectFB/Core: core_arena_add_shared_field( 'surface_core' -> 0xb92c20 )
(-) [dfbshow 7197.207,192] ( 3176) Core/Parts: Going to initialize 'system_core' core...
(-) [dfbshow 7197.207,295] ( 3176) Core/System: dfb_system_core_initialize( 0x76fee738, 0x417cb8, 0x417cd0 )
(-) [dfbshow 7197.207,414] ( 3176) DirectFB/Core: core_arena_add_shared_field( 'fbdev' -> 0x775242c0 )
(-) [dfbshow 7197.208,402] ( 3176) FBDev/VT: dfb_vt_initialize()
(-) [dfbshow 7197.208,706] ( 3176) FBDev/VT: vt_get_fb( 1 )
(-) [dfbshow 7197.208,846] ( 3176) FBDev/VT: -> -1
(-) [dfbshow 7197.208,921] ( 3176) FBDev/VT: vt_set_fb( 1, -1 )

```

It then hangs there forever.

Killing it results in a segfault and the kernel complaining.

Kernel log

```
[7246.860202] do_page_fault(): sending SIGSEGV to SigHandler for invalid read access from 000000ac
[7246.869193] epc = 770b8988 in libfusion-1.8.so.0.0.0[77092000+44000]
[7246.875703] ra = 770a964c in libfusion-1.8.so.0.0.0[77092000+44000]

```

So now I have a DirectFB which compiles but hangs up. The `vt_get_fb( 1 ) => -1` is the first suspicious thing I'll have to investigate.

Have any of you encountered a similiar situation or might point me in the right direction for debugging? Chances are someone knowns DirectFB on in an embedded environment better than me as a first-user.

---

<div class="post-metadata">

**Author:** ![maxgerhardt](https://forum.openwrt.org/letter_avatar/maxgerhardt/32/5_5575768a8748004e209b776fc1b2916d.png) [@maxgerhardt](https://forum.openwrt.org/u/maxgerhardt)\
**Post date:** [August 26, 2018, 9:21pm UTC](https://forum.openwrt.org/t/need-debugging-help-with-directfb-lede/19985/2 "2018-08-26T21:21:21Z")

</div>

Missing links because this forum does not allow me to post more than 2 links in a topic.. (like, what.)

- Ancient `Makefile` for DirectFB + OpenWRT I've found: [https://gitlab.com/lede/openwrt-packages/tree/master/libs/libdirectfb](https://gitlab.com/lede/openwrt-packages/tree/master/libs/libdirectfb)
- post detailing how `fbdev` was built: [https://community.onion.io/topic/3050/fb\_ili9341-80fps-up-to-100fps-memcpy-387-fps-minimal](https://community.onion.io/topic/3050/fb_ili9341-80fps-up-to-100fps-memcpy-387-fps-minimal)
- Log when program is aborted with `Cltr+C`: `https://pastebin.com/QfpGfAiK`