PCM audio CM3 on I2S1_M1

[flatmax]

I’ve created and tested a branch on the buidlroot.rockchip repo which generates I2S audio on the cm3 boards using the i2s1 bus.

Buildroot for the CM3 IO board released

A buildroot image can now be produced for the CM3 io board. Full details and updates available here : https://github.com/flatmax/buildroot.rockchip At the time of writing the radxa uboot system doesn’t load boot.scr uboot scripts and execute them. This is handled by this issue Autorun a uboot script Once build, during boot you will need to manually copy and paste boot commands into the console, check the readme for more information.