z80sim README
^^^^^^^^^^^^^
This port uses a primitive, emulated Z80 and the SDCC toolchain.
The instruction set emulator can be found in the NuttX CVS at
http://nuttx.cvs.sourceforge.net/nuttx/misc/sims/z80sim
The SDCC toolchain is available from http://sdcc.sourceforge.net/. All
testing has been performed using verison 2.6.0 of the SDDC toolchain.
Configuring NuttX
^^^^^^^^^^^^^^^^^
defconfig
The default configuration file, defconfig, performs a simple,
minimal OS test using examples/ostest. This can be
configurated as follows:
cd tools
./configure.sh z80sim
cd -
. ./setenv.sh
nshconfig
This configuration file builds NSH (examples/nsh). This
configuration is not functional due to issues with use of the
simulated serial driver (see the TODO list).
This alternative configuration can be selected by:
(Seleted the default configuration as show above)
cp config/z80sim/nshconfig .config
Building the SDCC toolchain
^^^^^^^^^^^^^^^^^^^^^^^^^^^
The SDCC toolchain is built with the standard configure/make/make install
sequence. However, some special actions are required to generate libraries
compatible with this build. First start with the usual steps
download
unpack
cd sdcc
./configure
But before making, we need to apply a patch to the SDCC 2.6.0 source
so that the z80 assembler can handle long symbol names
Apply sdcc-2.6.0-asz80-symlen.patch
cd sdcc/device/lib
Then make the SDCC binaries
cd sdcc
make
and install SDCC:
sudo make install
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