ubuntu for AM5728

搭建文件系统
1.The main reference is https://gnu-linux.org/building-ubuntu-rootfs-for-arm.html
But there has some notes：

1)the last ttyS0 must be ttyS2 for TI AM572x

2)”sudo start ttyS2” is added to ubuntu-rootfs/etc/rc.local

2.The config files need maybe only the …/ti-processor-sdk-linux-rt-am57xx-evm-04.00.00.04/targetNFS/boot/(all files) which copied to ubuntu-rootfs/boot.
2.搭建图形界面