Specifically, the HDMI pass-through variant, that is useful incase you dont want your OS (eg. M$ crud) to notice you for example using a HDMI switcher or a stupid display that "detaches" when it sleeps.
The thing is just a small 24C02S TSOT-23-5 256-byte EEPROM wired up to the computer side of the thing, with the Hotplug Detect pin pulled up to 5V with a resistor AND connected to the WP pin of the EEPROM.
It presents the EDID of an oddball 4k TV, so in case that doesnt fit your use case (eg. not a 4k device, or not audio capable, etc), you can write that EEPROM with
your EEPROM writer of choice just by getting a female (i think, like in a GPU) HDMI connector (or splice an extension cable) and wiring HPD to ground and the rest 4 (GND,5V,SDA,SCL) to your programmer.
I suppose if you have a GPU with working I2C drivers in linux, you can also just get an extension cable and ground the HPD inside it and flash with that.
Other generic notes: this will break HDCP since nothing is connected to the display side DDC I2C pins, and yeah you plug the thing into your GPU (ignore the source and sink texts, they just confused me).
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