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imx6q hdmi not display

Question asked by 田曙亮 on Sep 8, 2015
Latest reply on Sep 9, 2015 by 田曙亮

I use MCIMX6Q-SDB board to test hdmi interface, use hdmi-vga adapter to connect pc display, but display nothing.

image is linux 3.0.35,supplied by freescale.

 

1.uboot bootargs is :

console=ttymxc0,115200 androidboot.console=ttymxc0 vmalloc=400M init=/init video=mxcfb0:dev=hdmi,1920x1080M@60 video=mxcfb1:off video=mxcfb2:off fbmem=28M

 

2.after system start, some parameters are :

cd /sys/devices/platform/mxc_hdmi

 

cat cable_state

plugin

 

cat edid

0(all is 0)

 

cat hdcp_enable

hdcp disable

 

cat rgb_out_enable

RGB out

 

cat fb_name

DISP3 BG

 

cd /sys/class/graphics/fb0/

cat modes

U:1280x720p-120

U:1280x720p-100

U:1920x1080p-30

U:1920x1080p-25

U:1920x1080p-24

U:1920x1080p-50

U:1440x576p-50

U:1440x576p-50

U:1440x288p-50

U:1440x288p-50

U:1280x720p-50

U:720x576p-50

U:720x576p-50

U:1920x1080p-60

U:1440x480p-60

U:1440x480p-60

U:1440x240p-60

U:1440x240p-60

U:1280x720p-60

U:720x480p-60

U:720x480p-60

U:640x480p-60

V:1280x1024p-60

V:1024x768p-60

V:640x480p-60

 

cat mode

U:1920x1080p-60

 

cat fsl_disp_dev_property

hdmi

 

3.plug in hdmi ,kernel log is

mxc_hdmi mxc_hdmi: Read EDID again

mxc_hdmi mxc_hdmi: No modes read from edid

mxc_hdmi mxc_hdmi: create default modelist

 

I want to know why imx6q hdmi can't display.

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