Final puzzle piece for the firmware, the sound.

I spend some time to clean up my last patch, its works perfect now.

It is still all in http://github.com/vonger/vocore2.

patch openwrt first to enable sound setting in DTS(default it is off), and 810 patch is for linux kernel sound driver.

patch -p1 < ./package/kernel/es8388/openwrt/000-*.patch
cp ./package/kernel/es8388/openwrt/810*.patch ./target/linux/ramips/patches-4.14

note: this patch require patch ./package/kernel/mt7628/openwrt/000-vocore2-compatible.patch first.

In make menuconfig, Kernel modules -> Sound Support -> select kmod-sound-corec then kmod-sound-mt7628.
After you make again, now you have a perfect firmware for VoCore2 Ultimate, also very tiny, around 4096KB.