Linux 6.18 now boots on the Amazon Echo Show 8 2nd gen

Amazon shipped this with a 32-bit 4.4 kernel on a 64-bit MT8183. It now boots mainline 6.18 arm64. Screen, touch, Wi-Fi, USB and audio all work, with a real display driver still to go.

Most of MT8183 is already in mainline thanks to the Chromebooks that use it, which helped a lot. What wasn't there was the board itself: device tree, an audio machine driver, and a fix to the AFE driver that I'll try to send upstream once it's cleaned up.

Getting there took opening one up and finding the serial pads, since the stock kernel turns serial off. Notes and code will be in TECHO5 (https://github.com/HuskerMinion/techo5) when it's released.

https://redd.it/1x6r1t6
@r_linux