[simple_system] Argument parsing fix

examples/simple_system/README.md

@@ -32,9 +32,9 @@ with different configurations of Ibex, specified by parameters. To build the
 "small" configuration, run the following command from the Ibex repository root.
 
 
-```
-fusesoc --cores-root=. run --target=sim --setup --build \
-        lowrisc:ibex:ibex_simple_system $(util/ibex_config.py small fusesoc_opts)
+```sh
+util/ibex_config.py small fusesoc_opts | fusesoc --cores-root=. run --target=sim --setup \
+    --build lowrisc:ibex:ibex_simple_system
 ```
 
 To see performance counters other than the total number of instructions

examples/sw/benchmarks/README.md

@@ -11,7 +11,7 @@ All of these benchmarks run on Simple System. A verilator simulation suitable
 for running them can be built with:
 
 ```
-fusesoc --cores-root=. run --target=sim --setup --build lowrisc:ibex:ibex_simple_system `./util/ibex_config.py maxperf fusesoc_opts`
+util/ibex_config.py maxperf fusesoc_opts | fusesoc --cores-root=. run --target=sim --setup --build lowrisc:ibex:ibex_simple_system
 ```
 
 This will build a simulation of Ibex in the 'maxperf' configuration.

util/ibex_config.py

@@ -129,7 +129,7 @@ def output(self, config, args):
         fusesoc_cmd = []
         for fld, typ in Config.known_fields:
             val = config.params[fld]
-            fusesoc_cmd.append(shlex.quote(f'--{fld}={val}'))
+            fusesoc_cmd.append(f'--{fld} {val}')
 
         return ' '.join(fusesoc_cmd)