kumquat-buildroot/board/qemu/xtensa-lx60
..
linux
linux-4.4.config
readme.txt
xtensa_dc232b.tar

Run the emulation with:

 qemu-system-xtensa -M lx60 -cpu dc232b -monitor null -nographic -kernel output/images/Image.elf

The login prompt will appear in the terminal that started Qemu.

Tested with QEMU 2.3.0