Change 3.5" HDMI display boot logo

Discussion about other hardware (including other Pi-like boards)
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Change 3.5" HDMI display boot logo

Post by floppes » Fri Jul 13, 2018 2:37 pm

I am using the 3.5" HDMI display from KeDei for my Game Boy Zeros. It has always annoyed me that it boots with a blue screen and the manufacturer's logo:
1.png (434.9 KiB) Viewed 83 times
The board contains a Realtek RTD2662 display controller. I found some firmwares and source code for this controller on the net and figured out how the boot logo is encoded within the firmware. The firmware is stored on an SPI flash chip on the board which can be programmed externally through the I2C pins of the HDMI connector. I wrote an Arduino sketch and a Windows tool (should also work with Mono on Linux/Mac) to modify the firmware and embed your own custom logo. The logo is limited to two colors and 204x72 pixels. You can also disable the "HDMI" pop-up message or change it's text.

This is how I changed it:
2.png (530.46 KiB) Viewed 83 times
You can find the project source code and more info on Github:

I hope this is useful for others as well 8-)

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Re: Change 3.5" HDMI display boot logo

Post by Helder » Fri Jul 13, 2018 4:30 pm

Awesome work!Thanks for sharing.
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Re: Change 3.5" HDMI display boot logo

Post by McGyver » Fri Jul 13, 2018 8:24 pm

Amazing! Thank you for your investigatin and sharing.

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Re: Change 3.5" HDMI display boot logo

Post by VeteranGamer » Sat Jul 14, 2018 2:04 am

really great stuff, thanks.........

i've got a couple of these screen that i was planning on using again in a Gameboy build....



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Re: Change 3.5" HDMI display boot logo

Post by tinkerBOY » Sat Jul 14, 2018 3:58 am

wow thank you for sharing! I like the kedei screen and used it on my previous Pi3 build but i must admit i don't like seeing the 'KEDIE' logo.

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