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readme: CONFIG_LOGO, group with other interactive stuff

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Ciro Santilli
2018-04-18 15:25:10 +01:00
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README.adoc
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@@ -2440,33 +2440,6 @@ echo 1 > /proc/sys/kernel/panic_on_warn
insmod /warn_on.ko
....
=== 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!
Must be run in <<graphic-mode>>.
Stop the cursor from 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
=== Linux kernel tracing
==== CONFIG_PROC_EVENTS
@@ -2776,7 +2749,36 @@ But in part because it is dying, I didn't spend much effort to integrate it into
Maybe some brave should will send a pull request one day.
=== Linux kernel magic keys
=== Linux kernel interactive stuff
==== Linux kernel 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!
Must be run in <<graphic-mode>>.
Stop the cursor from 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
==== Linux kernel magic keys
Let's have some fun.
@@ -2847,6 +2849,26 @@ but nothing changed.
Note that on Ubuntu 17.10, to get to the text terminal from the GUI we first need `Ctrl-Alt-Fx`, and once in the text terminals, `Alt-Fn` works without `Ctrl`.
==== CONFIG_LOGO
If you compile the kernel with `CONFIG_LOGO=y`, and run in <<graphic-mode>>, then you get a Penguin image for <<number-of-cores,every core>> above the console! https://askubuntu.com/questions/80938/is-it-possible-to-get-the-tux-logo-on-the-text-based-boot
`reset` on the terminal then kills the poor penguins.
When `CONFIG_LOGO=y` is set, the logo can be disabled at boot with:
....
./run -e 'logo.nologo'
....
* https://stackoverflow.com/questions/39872463/how-can-i-disable-the-startup-penguins-and-boot-text-on-linaro-ubuntu
* https://unix.stackexchange.com/questions/332198/centos-remove-penguin-logo-at-startup
Looks like a recompile is needed to modify the image...
* https://superuser.com/questions/736423/changing-kernel-bootsplash-image
* https://unix.stackexchange.com/questions/153975/how-to-change-boot-logo-in-linux-mint
=== Linux kernel testing
https://stackoverflow.com/questions/3177338/how-is-the-linux-kernel-tested