WIP docs how to build the kernel

diff --git a/HDL_workflow/microwatt.mdwn b/HDL_workflow/microwatt.mdwn
index 8de9495b2d18ae55ea361bc67ae5586ce57cc951..70e27e9895bad93c97e563dea35202f407649aa2 100644 (file)
--- a/HDL_workflow/microwatt.mdwn
+++ b/HDL_workflow/microwatt.mdwn
@@ -16,4 +16,17 @@ with the message Microwatt, it works. On my ASUS KGPE D16 this takes
 
      real      1m4.986s
      user      1m4.373s
-     sys       0m0.013s
\ No newline at end of file
+     sys       0m0.013s
+     
+## Building the kernel
+On a POWER9 there is no need to install a cross compiler, 
+you can omit CROSS_COMPILE and ARCH in this case
+
+       apt install gcc-powerpc64le-linux-gnu
+       apt install flex bison
+       git clone -b microwatt-5.7 https://git.kernel.org/pub/scm/linux/kernel/git/joel/microwatt.git
+       cd microwatt
+       wget https://ozlabs.org/~paulus/rootfs.cpio.xz FIXME 404
+       unxz rootfs.cpio.xz
+       CROSS_COMPILE="ccache powerpc64le-linux-gnu-" ARCH=powerpc make -j8 O=microwatt microwatt_defconfig
+       CROSS_COMPILE="ccache powerpc64le-linux-gnu-" ARCH=powerpc make -j8 O=microwatt