When I used pre-compiled system.img and other required images on Hikey board.

which are shared from the below path. https://builds.96boards.org/releases/hikey/linaro/aosp/latest/

I am using below HDMI display and could see android display comes up with the pre compiled images(looks like lollipop AOSP version).

http://www.gechic.com/product_help_en.asp?s=10

However when I built the latest AOSP code, with generated images.

I have flashed those on Hikey board with same setup above.

And could not see the display is coming up.

It may be some issue with the display configuration on latest AOSP built, Got this log from logcat not sure it is expecting built in display rather than HDMI display? DisplayManagerService: Display device added: DisplayDeviceInfo{“Built-in Screen”: uniqueId=”local:0″, 1024 x 768, modeId 1, defaultModeId 1, supportedModes [{id=1, width=1024, height=768, fps=60.000004}], colorTransformId 1, defaultColorTransformId 1,

On Wednesday, May 18, 2016 at 10:04:08 PM UTC-7, Amit Pundir wrote:

On 18 May 2016 at 04:18, YADLA NIRANJAN <niru...@gmail.com javascript:> wrote:

...

Latest built AOSP images are not working on Hikey Board.

Followed instructions to make system.img and other images from the link below. http://source.android.com/source/devices.html

Loaded these system.img ,cache.img and userdata.img generated images on Hikey board and connected HDMI output from HIkey Board to HDMI display. However I could not see any display on HDMI screen.

Please refer the attached logcat.txt and suggest me if I am missing anything.

AOSP seem to have booted up fine on Hikey. See "SystemBroadcastReceiver: Boot has been completed" in your logcat.

Did you try connecting hikey to any other HDMI display?

Regards, Amit Pundir

...

Thanks, NY

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here is the working hdmi display on HiKey http://www.amazon.com/Lilliput-Fa1011-np-Touch-Monitor-Input/dp/B0046CBB9C/r...

On Wednesday, May 18, 2016 at 10:04:08 PM UTC-7, Amit Pundir wrote:

On 18 May 2016 at 04:18, YADLA NIRANJAN <niru...@gmail.com javascript:> wrote:

...

Latest built AOSP images are not working on Hikey Board.

Followed instructions to make system.img and other images from the link below. http://source.android.com/source/devices.html

Loaded these system.img ,cache.img and userdata.img generated images on Hikey board and connected HDMI output from HIkey Board to HDMI display. However I could not see any display on HDMI screen.

Please refer the attached logcat.txt and suggest me if I am missing anything.

AOSP seem to have booted up fine on Hikey. See "SystemBroadcastReceiver: Boot has been completed" in your logcat.

Did you try connecting hikey to any other HDMI display?

Regards, Amit Pundir

...

Thanks, NY

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Hi ,

Changed GeChic HDMI display to Lilliput HDMI display and now I could see display comes up. Thanks for your support.!

Thanks , Niranjan

On Fri, May 20, 2016 at 12:37 PM, John Stultz john.stultz@linaro.org wrote:

On Fri, May 20, 2016 at 10:59 AM, NY niruyadla@gmail.com wrote:

...

When I used pre-compiled system.img and other required images on Hikey board.

which are shared from the below path. https://builds.96boards.org/releases/hikey/linaro/aosp/latest/

I am using below HDMI display and could see android display comes up with the pre compiled images(looks like lollipop AOSP version).

http://www.gechic.com/product_help_en.asp?s=10

However when I built the latest AOSP code, with generated images.

I have flashed those on Hikey board with same setup above.

And could not see the display is coming up.

It may be some issue with the display configuration on latest AOSP built, Got this log from logcat not sure it is expecting built in display rather than HDMI display? DisplayManagerService: Display device added: DisplayDeviceInfo{“Built-in Screen”: uniqueId=”local:0″, 1024 x 768, modeId 1, defaultModeId 1, supportedModes [{id=1, width=1024, height=768, fps=60.000004}], colorTransformId 1, defaultColorTransformId 1,

Can you provide dmesg output from the board? (you can capture this via "adb shell dmesg")

The HiKey board has some limitations in generating mode clock rates which drive displays. Some monitors could handle these limitations better then others, so we've recently tried to limit it to some of the common known good rates.

Its likely that the monitor you have wants one of the problematic rates that HiKey has trouble with and possibly doesn't support any of the known good rates. But it might be possible that the display supports rates that HiKey can do, but I wasn't able to validate at the time.

thanks -john