Support 21:9 monitor resolution via HDMI in Raspberry Pi 3

I didn’t find well documented boot config to support 21:9 aspect ratio for Raspberry Pi 3, via HDMI interface. So after some internet research, got things working well. Here to share it for other people’s convenience. Note that I used 2560 * 1280 for the 21:9 monitor, even though it supports 3440 * 1440 by default:

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