bak

Author: cirosantilli

buildroot.md

@@ -108,27 +108,88 @@ Grouped under `packages/Config.in`:
 
 Many / all are SDL based. It seems that SDL has an `fbdev` mode that dispenses X11.
 
+### prdoom
+
+### chocolate-doom
+
+Doom clones.
+
+This shows one running on uclinux blackfin SDL DirectFB: https://www.youtube.com/watch?v=fKyQOntPEFs
+
 ### ltris
 
 ### lbreakout2
 
-Fails with:
+From: http://lgames.sourceforge.net/about.php
+
+Simple SDL based games `L` stands for Linux.
+
+Should be able to run on framebuffer? But both on TTY and X11 they fail with:
 
     set_video_mode: cannot allocate screen: Couldn't set console screen info
 
+Looks like this is caused by the call: <https://www.libsdl.org/release/SDL-1.2.15/docs/html/sdlsetvideomode.html>
+
+`fbset` seems to do the same calls, and fails in the same way.
+
 ### opentyrian
 
-Hangs.
+Takes over screen and hangs.
 
 ### sl
 
 Classic steam locomotive `sl` typo corrector. Text only.
 
+### gnuchess
+
+CLI chess.
+
 ## X11
 
 http://unix.stackexchange.com/questions/70931/install-x11-on-my-own-linux-system
 
-## Firefly
+## GUI
+
+- <http://unix.stackexchange.com/questions/70931/install-x11-on-my-own-linux-system/306116#306116>
+
+## SDL without X11
+
+- <http://stackoverflow.com/questions/1263710/minimal-linux-distrobution-with-sdl-support-and-no-xwindows>
+
+## Web browser
+
+- <http://unix.stackexchange.com/questions/17779/how-can-i-build-a-custom-distribution-for-running-a-simple-web-browser/306192#306192>
+
+## Debugging tools
+
+The basics: always compile with:
+
+- debugging symbols
+- gdb and gdbserver on target
+- host cross gdb
+- strace
+
+## sshd
+
+<http://stackoverflow.com/a/39301480/895245>
+
+## nc
+
+## netcat
+
+Not enabled on BusyBox by default, see: `package/busybox/default.config`
+
+But we have ping (TODO from where?), so whatever.
+
+## Boards
+
+### Raspberry pi
+
+TODO: how to emulate with QEMU? `aarch` procedure did no work, no `dtb` file.
+
+Just worked on a PI2 via UART. No `sshd` daemon though.
+
+### Firefly
 
 - <https://bugs.busybox.net/show_bug.cgi?id=9226>
 - <http://bbs.t-firefly.com/forum.php?mod=viewthread&tid=1777>

dev-filesystem.md

@@ -185,16 +185,18 @@ Example: write pseudorandom sequences into `/dev/sda/` to hide data:
 
 You can have some fun with mouses. Search for the mice or mouse device files and cat them:
 
-    sudo cat /dev/input/mice
+    sudo hd /dev/input/mice
 
 And then:
 
-    sudo cat /dev/input/mouse0
+    sudo hd /dev/input/mouse0
 
 Now note that when you move the mouse, cat spits something out to the screen!
 
 `mice` is the combination of all mice, and each other `mouseX` is a single mouse device.
 
+This subsystem is called `evdev`: <https://en.wikipedia.org/wiki/Evdev>
+
 ## /dev/shm
 
 Files created by `shm_open` calls. This function is part of POSIX, but creation of the files under `/dev` is not.

qemu.md

@@ -312,7 +312,17 @@ Those allow you to observe the program state without using an external debugger
 
 TODO: example.
 
-## Access host
+### Monitor telnet from host:
+
+Run QEMU with:
+
+    -monitor telnet:127.0.0.1:1234,server,nowait \
+
+Then:
+
+    telnet localhost 1234
+
+## Access host IP from QEMU
 
 By default, the guest sees the host on a network at address 10.0.2.2.
 
@@ -325,11 +335,13 @@ and inside a BusyBox image do:
     wget 10.0.2.2:8000
     cat index.html
 
-## Serial console
+### Access QEMU IP from host
 
-## Parallel console
+<http://unix.stackexchange.com/questions/124681/ssh-from-host-to-guest-using-qemu>
 
-Enter with: `Ctrl + Alt + 3` and `Ctrl + Alt + 4`. TODO example.
+Looks like:
+
+    -net user,hostfwd=tcp::2222-:22
 
 ## Shared filesystem with host
 
@@ -338,3 +350,11 @@ For simpler applications, just use `nc` or `wget`
 NFS: TODO example. With this you can just mount a filesystem on the guest and it synchronizes automagically. Buildroot does have an NFS package.
 
 Without networking: <http://superuser.com/questions/628169/qemu-to-share-a-directory-with-the-host>
+
+## Serial
+
+## TTL
+
+TODO: like the serial present on most dev boards, which gives a shell that can be accessed with:
+
+    telnet localhost 1234

window-manager.md

@@ -107,3 +107,7 @@ Restart Compiz after modifying configurations to load them:
     compiz --replace
 
 You should do this from a tty other than `tty7`.
+
+## Matchbox
+
+Minimalistic, one window at a time only. Embedded focus. Buildroot 2016-05 has a package for it.

x11.md

@@ -172,10 +172,6 @@ To make this happen every time at startup TODO broken?:
 
 The `~/.xsession` file could also be used depending on system
 
-## xinitrc
-
-Sourced in Ubuntu 12.04, but not 14.04.
-
 ## xsessionrc
 
 TODO vs `xinitrc`?
@@ -394,33 +390,17 @@ Put this in your `~/.xinitrc`.
 
 Either for testing or useful utilities.
 
--   `xcalc`
-
-    Simple scientific calculations
-
--   `xgc`
-
-    X Graphics Demo.
-
--   `xeyes`
-
-    Fun X11 test program.
-
--   `xfontsel`
-
-    Point and click and view how a font looks like.
-
--   `xmag`
-
-    Magnifying lens.
-
--   `xmore`
-
-    `more`, but in X!
-
--   `xtime`
-
-    Pointer clock.
+-   `xcalc`: simple scientific calculator
+-   `xedit`: text editor
+-   `xeyes`: fun X11 test program
+-   `xfontsel`: point and click and view how a font looks like
+-   `xgc`: X Graphics Demo. A GUI.
+-   `xlogo`: a window with an X11 logo
+-   `xmag`: magnifying lens
+-   `xmessage`: `zenity`'s grandfather
+-   `xmore`: `more` for X
+-   `xtime`: pointer clock
+-   `xterm`: terminal
 
 ### xev
 
@@ -441,10 +421,21 @@ Try clicking on the windows, or using your keyboard to see the outputs.
 - <http://stackoverflow.com/questions/24147026/display-gui-on-raspeberry-without-startx>
 - <http://superuser.com/questions/904142/launching-programs-with-gui-without-display-manager>
 
+### xinit
+
+https://en.wikipedia.org/wiki/Xinit backend of startx
+
+#### xinitrc
+
+Sourced in Ubuntu 12.04, but not 14.04.
+
 ## startx
 
-TODO example
+<http://askubuntu.com/questions/518454/what-does-startx-command-do/817747#817747>
 
-### xinit
+Script to start an graphical session.
 
-https://en.wikipedia.org/wiki/Xinit backend of startx
+**Don't ever run `sudo startx` on an Ubuntu TTY**!!! It will break your UI. Fix:
+
+    sudo apt-get install --reinstall ubuntu-desktop gdm unity
+    sudo mv /etc/X11/xorg.conf "/etc/X11/xorg.conf.$(date '+%Y-%m-%d-%H-%M-%S').bak"