BBB Android and disabling HDMI

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Davide Birra

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Jun 30, 2015, 8:02:13 AM6/30/15
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Hi!
I'm trying to build and embedded system based on Beaglebone Black on BBB Android.

I've built the Android image from sources and everything worked flawlessly.

No I need the 20 pins binded to HDMI controller so i added this string

capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN

to mmcargs into uEnv.txt file (boot partition).

/sys/devices/bone_capemgr.9/slots file confirmed that HDMI firmware is not loaded.

root@beagleboneblack:/ # more /sys/devices/bone_capemgr.9/slots
more
/sys/devices/bone_capemgr.9/slots
 
0: 54:PF---
 
1: 55:PF---
 
2: 56:PF---
 
3: 57:PF---
 
4: ff:P-O-L Bone-LT-eMMC-2G,00A0,Texas Instrument,BB-BONE-EMMC-2G
 
5: ff:P-O-- Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI
 
6: ff:P-O-- Bone-Black-HDMIN,00A0,Texas Instrument,BB-BONELT-HDMIN

Ok, now i have my pins free but zygote refuses to start. I guess SurfaceFlinger can't find a video output device and crashes. This is the log part complaining about that.


01-01 00:34:07.761: I/SurfaceFlinger(30258): SurfaceFlinger is starting
01-01 00:34:07.761: I/SurfaceFlinger(30258): SurfaceFlinger's main thread ready to run. Initializing graphics H/W...
01-01 00:34:07.781: E/SurfaceFlinger(30258): hwcomposer module not found
01-01 00:34:07.781: E/SurfaceFlinger(30258): ERROR: failed to open framebuffer (No such file or directory), aborting
01-01 00:34:07.781: A/libc(30258): Fatal signal 6 (SIGABRT) at 0x00007632 (code=-6), thread 30258 (surfaceflinger)



Any idea to worksround this problem? I don't need any video output at all so it would be ok to not start surfaceflinger at all, but i can't achieve this without crashing the system.
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