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AIO-3399J latest Android 7.1 ROM with LVDS ?

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Posted at 1/10/2018 19:34:21     
Last edited by ducksoft In 1/10/2018 22:23 Editor

I need to use the LVDS connection on the AIO-3399J with Android 7.1

I cannot find the ROM pre-built.  The "download" tab for this specific board is empty : http://en.t-firefly.com/doc/download/index/id/31.html

This page http://en.t-firefly.com/doc/product/info/id/437.html mentions "You can download firmwares on compiled update.img" but the link goes nowhere.

Where can I find AIO-3399J Android 7.1 ROM with LVDS support ?

Regards

Tim
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Posted at 1/11/2018 09:34:51     
they have no lvds modules to sell temporary, but you can take a sample rk3399-firefly-aio-lvds.dts for debug
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Posted at 1/11/2018 10:01:21     
Last edited by ducksoft In 1/11/2018 10:48 Editor

1) I am looking for pre-built Android 7.1 ROM with LVDS support enabled.  I cannot find this ROM / img file(s).

2) As I cannot find a pre-built ROM I have just custom built a ROM and tried to enable LVDS using:
  $ make -j72 -d KERNEL_DTS=rk3399-firefly-aio-lvds
and flashed the AIO-3399J board with the new system.img

I have connected my LVDS display controller to the LVDS connector on the board.  I have also connected the LVDS power.  I have set the LCD_VCC to 12v using jumper pin.

I disconnect HDMI display, reboot the board with only LVDS connected but the display is off.

How do I get LVDS to work on the board in terms of ROM/software and hardware connection ?

I think you are referring me to the file kernel/arch/arm64/boot/dts/rockchip/rk3399-firefly-aio-lvds.dts but I don't know what to do next !

Regards

Tim
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Posted at 1/11/2018 17:53:06     
ducksoft Posted at 1/11/2018 10:01
1) I am looking for pre-built Android 7.1 ROM with LVDS support enabled.  I cannot find this ROM / i ...

1. make sure your LVDS connector data io is suitable for the board connector .
2. LVDS need backlight power, which voltage your LVDS needed , just short the power  silk-screen 'LCD_VCC'  on the board . These are 3.3v/5v/12v.
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Posted at 1/11/2018 18:11:24     
1. Yes I have confirmed the LVDS pin connector between the AOI-3399J board and the display controller using the documentation.

2. Yes I have set theLCD_VCC pins (see above "I have set the LCD_VCC to 12v using jumper pin.") and also tried 3.3V and 5V just incase :-)

I think I need to set the display panel characteristics in some .dts file but I'm not sure if I need to just update the rk3399-firefly-aio-lvds.dts file directly or if I need to copy this file to a new file and update the new file?

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Posted at 1/11/2018 19:09:33     
ducksoft Posted at 1/11/2018 18:11
1. Yes I have confirmed the LVDS pin connector between the AOI-3399J board and the display controlle ...

1."make ARCH=arm64 rk3399-firefly-aio-lvds.img -j8 " for making kernel.img and resource.img
flash them just fine .
2. After that, backlight is the first stuff to make sure.
3. Follow your LVDS datasheet to comfirm the timing .
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