Merge "Switch from Makefile to GN"
diff --git a/README.md b/README.md
index 8c6b340..95beaeb 100644
--- a/README.md
+++ b/README.md
@@ -107,6 +107,20 @@
The compiled image is stored in `arch/arm64/boot/Image`. This should be copied
to the Hafnium ramdisk's root as `vmlinuz`.
+### Kernel Module
+
+From the hafnium root directory, the following commands can be used to compile
+the kernel module, replacing `<kernel-path>` with the path to the kernel built
+in the previous section:
+
+``` shell
+cd hafnium/driver/linux/
+ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- KERNEL_PATH=<kernel-path> make
+```
+
+The compiled module is called `hafnium.ko`, and should be copied into the
+ramdisk described in the next section.
+
### Busybox RAM disk
An initial ramdisk for the primary VM containing busybox can be built with the
@@ -136,8 +150,15 @@
EOF
chmod u+x etc/init.d/rcS
grep -v tty ../examples/inittab > ./etc/inittab
+```
+
+At this point you can copy into the current directory additional files you may
+want in the ramdisk, for example, the kernel module built in the previous
+section. Then run the following commands:
+
+``` shell
find . | cpio -o -H newc | gzip > ../initrd.img
-cd -
+cd ..
```
The resulting file is `initrd.img`. It should be copied to the Hafnium ramdisk's
