update instructions in readme, setup

readme.txt

@@ -19,13 +19,14 @@ the packages listed below are sufficient.
 next, you will need to download and compile some dependencies. the script in
 setup.sh will do this for you. if it sees an environment variables MAKEOPTS, it
 will pass the contents of that as arguments to invocations of make. otherwise,
-it defaults to "-j$(nproc)". if you nead to clean that setup for any reason,
-you can use the script in clean-setup.sh.
+it defaults to "-j$(nproc)".
 
 now that we have all the dependencies, just run "make". the default target is
 build/disk.iso, a bios-bootable disk image. you can run "make debug" to start
-qemu with that disk, and attach gdb to it. you can also use "make clean" to
-remove all of the files that "make" creates.
+qemu with that disk, and attach gdb to it. you will have to run "continue" (or
+"c" for short) in gdb to let qemu start. consider temporarily changing -O3 to
+-Og in the CC_EXTRA_ARGS variable of the makefile temporarily if you want to
+do any serious debugging.
 
 acknowledgements (any under "dependencies" are downloaded during build):
 

setup.sh

@@ -10,14 +10,14 @@ PROJECT_ROOT="$(pwd)"
 if [ -e .setup-complete ]; then
   echo setup has already completed. refusing to run again.
   echo to run again anyway, delete .setup-complete
-  echo to clean the dependencies, run clean-dependencies.sh
+  echo to undo any previous setup, run clean-setup.sh
   exit 1
 fi
 
 if [ -e .setup-started ]; then
   echo setup has already been started, but failed. refusing to run again.
   echo to run again anyway, delete .setup-started
-  echo to clean the dependencies, run clean-dependencies.sh
+  echo to undo any previous setup, run clean-setup.sh
   exit 1
 fi