readme: gem5 failed python script without rebuild attempt

README.adoc

@@ -4493,7 +4493,7 @@ Guest:
 
 ....
 touch /tmp/execfile
-chmoe +x /tmp/execfile
+chmod +x /tmp/execfile
 m5 execfile
 ....
 
@@ -4530,6 +4530,21 @@ Unfortunately-we didn't manage to find an ARM analogue: link:kernel_module/pmccn
 * https://stackoverflow.com/questions/31620375/arm-cortex-a7-returning-pmccntr-0-in-kernel-mode-and-illegal-instruction-in-u/31649809#31649809
 * https://blog.regehr.org/archives/794
 
+=== gem5 Python scripts without rebuild
+
+TODO
+
+Currently, when you modify the python scripts under `gem5/gem5`, you still have to run `./build` to copy the updated scripts to the `out/<arch>/buildroot` directory, which kind of defeats the purpose of having an interpreted language as Python.
+
+We would like to solve that, but are blocked on either of the following:
+
+* build in-tree and skip the Buildroot sync step. If sync is not skipped, it would copy all builds to all archs, which is huge.
++
+But then we have to deal specially with the `m5` tool, which has to be cross compiled
+* gem5 out of tree build. Is there support? Looks like SCons does not have anything generic as usual and leaves the burden on project developers:
+** https://stackoverflow.com/questions/3720142/how-to-force-scons-output-exe-obj-lib-dll-to-specific-build-directory
+** https://stackoverflow.com/questions/1762044/how-to-do-an-out-of-source-build-with-scons
+
 == Insane action
 
 === Run on host