The shix machine was a research project started around 2003 at
Télécom Paris. Preliminary support in QEMU was added in 2005
back when the QEMU architecture was less structured than it is
now. Unfortunately, the support for the shix machine and its
peripherals, such as the TC58128 16MiB flash device, has never
been maintained as the research project used the real machine.
This project stopped around 2010 and to the best of my knowledge
and after consulting with the original author Alexis Polti,
I propose to deprecate it in QEMU as well as the TC58128
flash device which does not implement the QOM model and still
contains debug fprintf statements.