README.md: Add build and installation info

- rc.local really isn't the right place for loading modules
- mention linux-headers package to avoid having to compile
  the whole kernel

Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

README.md

@@ -5,7 +5,10 @@ More Info: https://mntre.com/zz9000
 ## Build
 
 Adjust the path to your Linux kernel sources in the Makefile before
-starting. Then you can build the drivers out of the tree with
+starting. On Debian you can install linux-headers-m68k to get the kernel
+headers and the necessary Module.symvers file.
+
+Then you can build the drivers out of the tree with
 
 ```
 $ make
@@ -28,20 +31,33 @@ make[1]: Entering directory '/usr/src/linux-source-5.4'
 make[1]: Leaving directory '/usr/src/linux-source-5.4'
 ```
 
+Now you can install the drivers with
+
+```
+make modules_install
+```
+
 ## Loading the drivers
 
-You can load your drivers e.g. in your rc.local or in your initramfs.
-Make sure you actually load it (early on). Debian 10 does not have
-rc.local by default.
+You can load your drivers e.g. by creating a ZZ9000 specific file in
+/etc/modules-load.d:
 
 ```
+sudo vi /etc/modules-load.d/zz9000.conf
+```
+
+```
+# /etc/modules-load.d/zz9000
 #
-# rc.local
+# Load ZZ9000 modules automatically at boot
 #
-modprobe zz9000
-modprobe zz9000_graphics
-modprobe zz9000_network
-modprobe zz9000_usb
+
+zz9000
+zz9000-usb
+zz9000-network
+zz9000-graphics
+
+options zz9000-graphics noaccel
 ```
 
 On your next boot you should then see
@@ -62,7 +78,7 @@ On your next boot you should then see
 
 ## Graphics
 
-Boot the kernel with amifb=disable. The driver switches to
+Boot the kernel with video=amifb:off. The driver switches to
 1280x720-60@16 by default, but supports all resolutions that the card
 supports (non-16bit modes currently untested)