Re: Request: Recompile dCore-xenial to use more than 4 serial ports

Besides the package build-essential, you need the kernel source below if you are not already.  Also, start with the config that enables devtmpfs.  The README provides some basic info:

http://tinycorelinux.net/dCore/x86/import/src/kernel-4.2.9/linux-4.2...