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shantaramjagtap1994@
Contributor
Contributor
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Registered: ‎10-31-2018

Issue regarding about frame buffer device

Hello folks,


I am building system for hdmi output application.

I have issue regarding about frame buffer device. /dev directory is not showing any /dev/fb0 device.

petalinux ver 2017.4
vivado ver 2017.4

boot log for xilinx drm driver as follows

[ 1.509100] [drm] No max horizontal width in DT, using default 1920
[ 1.515317] [drm] No max vertical height in DT, using default 1080
[ 1.521578] OF: graph: no port node found in /amba_pl/xilinx_drm
[ 1.527561] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 1.534160] [drm] No driver support for vblank timestamp query.
[ 1.540396] [drm] Cannot find any crtc or sizes
[ 1.545341] [drm] Initialized xilinx_drm 1.0.0 20130509 for amba_pl:xilinx_drm on minor 0

when I am running modetest -M xilinx_drm command then connector status shows disconnected as given below .I have changed Desktop and cables two times but still not succeed. If i checked on baremetal application(HDMI Out) it works perfectly.

root@hdmio:~# modetest -M xilinx_drm
Encoders:
id crtc type possible crtcs possible clones
29 0 TMDS 0x00000001 0xffffffff

Connectors:
id encoder status name size (mm) modes encoders
30 0 disconnected HDMI-A-1 0x0 0 29
props:
1 EDID:
flags: immutable blob
blobs:

value:
2 DPMS:
flags: enum
enums: On=0 Standby=1 Suspend=2 Off=3
value: 0
5 link-status:
flags: enum
enums: Good=0 Bad=1
value: 0

CRTCs:
id fb pos size
28 0 (0,0) (0x0)
0 0 0 0 0 0 0 0 0 flags: ; type:
props:

Planes:
id crtc fb CRTC x,y x,y gamma size possible crtcs
27 0 0 0,0 0,0 0 0x00000001
formats: RG24
props:
6 type:
flags: immutable enum
enums: Overlay=0 Primary=1 Cursor=2
value: 1

Frame buffers:
id size pitch

Thanks in advance

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