A20接入HDMI花屏问题
本帖最后由 wuqingwei 于 2017-2-24 10:59 编辑我们在使用A20做测试时发现如下问题：
屏幕会花掉
系统连接图：
说明：
A20 使用固件cubieez-cb2-20151211-emmc-hdmi-V1.0.img.7z
2月24日更新，如下描述
A20 的HDMI输出和 另外一个HDMI信号接入一个类似矩阵的设备， 有时候会出现上述现象.
串口有如下打印
<6>ParseEDID
ParseEDID
<6>EDID version: 1.3
EDID version: 1.3
<6>PCLK=297000000 X 3840 3888 3920 4400 Y 2160 2163 2168 2250 fr 30 PP
PCLK=297000000 X 3840 3888 3920 4400 Y 2160 2163 2168 2250 fr 30 PP
<4>fbdev: 3840x2160 needs 66355200 bytes, but only 33554432 avail.
fbdev: 3840x2160 needs 66355200 bytes, but only 33554432 avail.
<6>PCLK=284500000 X 1920 1968 2000 2080 Y 2160 2163 2168 2280 fr 59 PP
PCLK=284500000 X 1920 1968 2000 2080 Y 2160 2163 2168 2280 fr 59 PP
<4>disp_clk: Could not find a matching pll-freq for 284500000 pclk
disp_clk: Could not find a matching pll-freq for 284500000 pclk
<4>Unimplemented SVD code 4
<4>Unimplemented SVD code 16
<4>Unimplemented SVD code 22
<4>Unimplemented SVD code 31
<4>disp_clk: Could not find a matching pll-freq for 53900000 pclk
<4>disp_clk: Could not find a matching pll-freq for 108100000 pclk
<4>disp_clk: Could not find a matching pll-freq for 74200000 pclk
<4>disp_clk: Could not find a matching pll-freq for 53900000 pclk
<4>disp_clk: Could not find a matching pll-freq for 72650000 pclk
<4>disp_clk: Could not find a matching pll-freq for 193250000 pclk
<4>disp_clk: Could not find a matching pll-freq for 172900000 pclk
<4>disp_clk: Could not find a matching pll-freq for 146850000 pclk
<4>disp_clk: Could not find a matching pll-freq for 74600000 pclk
<4>disp_clk: Could not find a matching pll-freq for 78800000 pclk
<4>disp_clk: Could not find a matching pll-freq for 26150000 pclk
<4>disp_clk: Could not find a matching pll-freq for 284600000 pclk
<4>fbdev: 3840x2160 needs 66355200 bytes, but only 33554432 avail.
Unimplemented SVD code 4
Unimplemented SVD code 16
Unimplemented SVD code 22
Unimplemented SVD code 31
disp_clk: Could not find a matching pll-freq for 53900000 pclk
disp_clk: Could not find a matching pll-freq for 108100000 pclk
disp_clk: Could not find a matching pll-freq for 74200000 pclk
disp_clk: Could not find a matching pll-freq for 53900000 pclk
disp_clk: Could not find a matching pll-freq for 72650000 pclk
disp_clk: Could not find a matching pll-freq for 193250000 pclk
disp_clk: Could not find a matching pll-freq for 172900000 pclk
disp_clk: Could not find a matching pll-freq for 146850000 pclk
disp_clk: Could not find a matching pll-freq for 74600000 pclk
disp_clk: Could not find a matching pll-freq for 78800000 pclk
disp_clk: Could not find a matching pll-freq for 26150000 pclk
disp_clk: Could not find a matching pll-freq for 284600000 pclk
fbdev: 3840x2160 needs 66355200 bytes, but only 33554432 avail.
<6>Parse_VideoData_Block: VIC 1 support
Parse_VideoData_Block: VIC 1 support
<6>Parse_VideoData_Block: VIC 2 support
Parse_VideoData_Block: VIC 2 support
<6>Parse_VideoData_Block: VIC 3 support
Parse_VideoData_Block: VIC 3 support
<6>Parse_VideoData_Block: VIC 4 support
Parse_VideoData_Block: VIC 4 support
<6>Parse_VideoData_Block: VIC 5 support
Parse_VideoData_Block: VIC 5 support
<6>Parse_VideoData_Block: VIC 7 support
Parse_VideoData_Block: VIC 7 support
<6>Parse_VideoData_Block: VIC 16 (native) support
Parse_VideoData_Block: VIC 16 (native) support
<6>Parse_VideoData_Block: VIC 18 support
Parse_VideoData_Block: VIC 18 support
<6>Parse_VideoData_Block: VIC 19 support
Parse_VideoData_Block: VIC 19 support
<6>Parse_VideoData_Block: VIC 20 support
Parse_VideoData_Block: VIC 20 support
<6>Parse_VideoData_Block: VIC 22 support
Parse_VideoData_Block: VIC 22 support
<6>Parse_VideoData_Block: VIC 31 support
Parse_VideoData_Block: VIC 31 support
<6>Parse_AudioData_Block: max channel=2
Parse_AudioData_Block: max channel=2
<6>Parse_AudioData_Block: SampleRate code=7
Parse_AudioData_Block: SampleRate code=7
<6>Parse_AudioData_Block: WordLen code=7
Parse_AudioData_Block: WordLen code=7
<6>Find HDMI Vendor Specific DataBlock
Find HDMI Vendor Specific DataBlock
<6>PCLK=148500000 X 1920 2008 2052 2200 Y 1080 1084 1089 1125 fr 60 PP
PCLK=148500000 X 1920 2008 2052 2200 Y 1080 1084 1089 1125 fr 60 PP
<6>Using above mode as preferred EDID mode
Using above mode as preferred EDID mode
<6>PCLK=74250000 X 1920 2008 2052 2200 Y 540 542 547 562 fr 60 PP
PCLK=74250000 X 1920 2008 2052 2200 Y 540 542 547 562 fr 60 PP
<6>PCLK=74250000 X 1280 1390 1430 1650 Y 720 725 730 750 fr 60 PP
PCLK=74250000 X 1280 1390 1430 1650 Y 720 725 730 750 fr 60 PP
<6>PCLK=27000000 X 720 736 798 858 Y 480 489 495 525 fr 59 NN
PCLK=27000000 X 720 736 798 858 Y 480 489 495 525 fr 59 NN
<6>PCLK=74250000 X 1280 1720 1760 1980 Y 720 725 730 750 fr 50 PP
PCLK=74250000 X 1280 1720 1760 1980 Y 720 725 730 750 fr 50 PP
fbdev: 3840x2160 needs 66355200 bytes, but only 33554432 avail.
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