From 12083ec1fa1cf5e973f87360b778accbea38c14c Mon Sep 17 00:00:00 2001
From: Ciro Santilli <ciro.santilli@gmail.com>
Date: Mon, 2 Apr 2018 20:34:29 +0100
Subject: [PATCH] readme: console fun, arm /dev/fb0 works

---
 README.adoc            | 29 +++++++++++++++++++++++++++++
 kernel_config_fragment |  3 +++
 2 files changed, 32 insertions(+)

diff --git a/README.adoc b/README.adoc
index 3835dd0..d7bad98 100644
--- a/README.adoc
+++ b/README.adoc
@@ -280,6 +280,27 @@ This makes things a bit more reproducible, since the microsecond in which you pr
 +
 But on the other hand maybe you are interested in observing the interrupts generated by key presses.
 
+==== Console fun
+
+You can also try those on the Ctrl + Alt + F3 of your Ubuntu host, but it is much more fun inside a VM!
+
+Stop blinking:
+
+    echo 0 > /sys/class/graphics/fbcon/cursor_blink
+
+Rotate the console 90 degrees!
+
+    echo 1 > /sys/class/graphics/fbcon/rotate
+
+Requires `CONFIG_FRAMEBUFFER_CONSOLE_ROTATION=y`.
+
+Documented under: `fb/`.
+
+TODO: font and keymap. Mentioned at: https://cmcenroe.me/2017/05/05/linux-console.html and I think can be done with Busybox `loadkmap` and `loadfont`, we just have to understand their formats, related:
+
+* https://unix.stackexchange.com/questions/177024/remap-keyboard-on-the-linux-console
+* https://superuser.com/questions/194202/remapping-keys-system-wide-in-linux-not-just-in-x
+
 === Automatic startup commands
 
 When debugging a module, it becomes tedious to wait for build and re-type:
@@ -1318,6 +1339,14 @@ A friend told me this but I haven't tried it yet:
 * `xf86-video-modesetting` is likely the missing ingredient, but it does not seem possible to activate it from Buildroot currently without patching things.
 * `xf86-video-fbdev` should work as well, but we need to make sure fbdev is enabled, and maybe add some line to the `Xorg.conf`
 
+Also if I do:
+
+....
+cat /dev/urandom > /dev/fb0
+....
+
+the screen fills up with random colors, so I think it can truly work.
+
 === X11 MIPS
 
 Haven't tried it, doubt it will work out of the box! :-)
diff --git a/kernel_config_fragment b/kernel_config_fragment
index 6cd069c..c16acaf 100644
--- a/kernel_config_fragment
+++ b/kernel_config_fragment
@@ -76,6 +76,9 @@ CONFIG_VIRTIO_PCI=y
 CONFIG_VIRTIO_BLK=y
 CONFIG_VIRTIO_NET=y
 
+# Misc
+#CONFIG_FRAMEBUFFER_CONSOLE_ROTATION=y
+
 ## Networking
 
 # Will everything blow up?