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Software Application Development No video display on Linaro Zedboard
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No video display on Linaro Zedboard

Former Member
Former Member over 11 years ago

Hi guys,

I've been following this tutorial (http://shakithweblog.blogspot.com/2012/12/getting-sobel-filter-application.html) and everything worked great. In the tutorial they give you the BOOT.BIN file ready, so now I'm trying to generate the BOOT.BIN file by myself and I've got some errors :/

To generate the BOOT.BIN file I'm using Xilinx SDK and three files: zynq_fsbl.elf, system.bit and u-boot.elf. These three files are the same as used to generate the original BOOT.BIN file. The Zedboard boots properly, but there is no video output (the HDMI monitor shows no display at all). Here are the two boot logs, one with the original project working properly and the second one where the video output fails.

boot log good (http://pastebin.com/2mR4va5r)
boot log hdmi problem (http://pastebin.com/kebAVeir)

The mayor difference between the 2 boots is this one:
GOOD ONE (lines 292 to 303):
Debug1a: analog_drm_encoder_mode_set
Debug1b: analog_drm_encoder_mode_set
Debug1c: analog_drm_encoder_mode_set
Debug2: analog_drm_encoder_set_clock
setting clock to: 148500
raw_edid: dc40e180 7
Using YCbCr output
Console: switching to colour frame buffer device 240x67
usb 1-1: new high-speed USB device number 2 using xusbps-ehci
fb0:  frame buffer device
drm: registered panic notifier
[drm] Initialized analog_drm 1.0.0 20110530 on minor 0

HDMI PROBLEM (lines 309 to 319)
Debug1a: analog_drm_encoder_mode_set
Debug1b: analog_drm_encoder_mode_set
Debug1c: analog_drm_encoder_mode_set
Debug2: analog_drm_encoder_set_clock
setting clock to: 65000
raw_edid:   (null) 0
Using RGB output
Console: switching to colour frame buffer device 128x48
fb0:  frame buffer device
drm: registered panic notifier
[drm] Initialized analog_drm 1.0.0 20110530 on minor 0

As you can see one is using YCbCr color space and the other one is using RGB, why do you think this is happening?

Hope you can help me on this one!

Thanks!

Nicolas

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  • Former Member
    0 Former Member over 11 years ago

    Hey,

    I have had exactly same issue on my zedboard and I believe that what's going on and what causes the issue.
    Long story short, on my observation, axi_iic interrupt number is not matched between XPS and device tree.
    For instance, the INT number is read as '56' on device tree - zynq-zed-sobel.dts but INT is shown as '89' which means that it should be '57' (= 89 - 32). Once the change - from 56 to 57 is made, the adv7511(HDMI) works.
    I hope that it would help someone who has same issue on zedboard and sobel filter project(Shakith Fernando's)

    Happy coding !!

    Thanks,

    Seungsik

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  • Former Member
    0 Former Member over 11 years ago in reply to Former Member

    It worked! Well, more or less...the HDMI monitor turns on but the screen is black (before the screen wouldn't even turn on).

    I think maybe the problem is with the .bit file I'm using. Could you point me out which files did you use to generate your BOOT.BIN file?

    Thanks a lot!

    Nicolu00E1s

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  • Former Member
    0 Former Member over 11 years ago in reply to Former Member

    I finally found the problem: the bit file that came in Shakith's project folder didn't work for me. When I used a bit file generated with XPS I could get linux working perfectly on the Zedboard. Now I'm trying to replace the sobel filter for a corner detector filter.

    Thank you very much for the help!

    Nicolu00E1s

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  • Former Member
    0 Former Member over 11 years ago in reply to Former Member

    Can you share your devicetree and linux side code which you used to read/write data at dev/mem. Actually I wish to add some modules in the original devicetree i.e that sobel filter but when ever I add I get some issues.
    Also can you answer this ?
    http://www.zedboard.org/content/how-can-i-read-data-output-stream-sobel-filter-block-what-address-outputstream
    I am not exactly able to understand whats happening in the code iic_write. though I am making some guesses but not able to exactly understand.
    Thanks

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