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Mini ITX 7z100 + petalinux image

tommek

Hello,

I have dowloaded the official AVNET's petalinux-based sd card image from AVNET's webpage

link: https://www.avnet.com/wps/portal/us/products/avnet-boards/avnet-board-families/mini-itx/

image: Zynq Mini-ITX 7Z100 Petalinux Design v2015.2.1 (files BOOT.BIN and image.ub)

 

It does not, however, properly boot without HDMI connected into the box / board.  I can't even observe complete U-Boot logs, so it must be shut down after the FSBL is run and FPGA is programmed.

With the HDMI cable plugged in (and the other end of the HDMI is plugged into a screen, obviously) everything works fine. But as soon as I disconnect the HDMI cable, the whole box is simply shutdown, i.e., the power is somehow cut off.

Is this a normal behaviour or there's something wrong with the hardware? (Note that there's also AD-FMCOMMS3-EBZAD-FMCOMMS3-EBZ from Analog Devices installed on the main board).

 

Thank you the help!

A

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    I've looked through the Mini-ITX documentation and can see nothing that would cause a shut-down with the HDMI unplugged. This is very strange. However, I have seen strange things in the past with poorly grounded power supplies. If the peripheral cable is providing a stable ground and is then removed, you could indeed experience very strange things. Or, it could be something completely different as well. Please let us know if you learn anything more!

    Bryan

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    I've looked through the Mini-ITX documentation and can see nothing that would cause a shut-down with the HDMI unplugged. This is very strange. However, I have seen strange things in the past with poorly grounded power supplies. If the peripheral cable is providing a stable ground and is then removed, you could indeed experience very strange things. Or, it could be something completely different as well. Please let us know if you learn anything more!

    Bryan

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