meg4/platform/fbdev_alsa

MEG-4 Linux FrameBuffer + ALSA Port

This directory contains the main executable for a backend that does not need any library, as it uses the Linux kernel interfaces directly. This allows this port to be used as a MEG-4 Operating System.

Compilation options

Command	Description
make	Compile the meg4 executable for this platform
make install	Install the compiled executable
make package	Create a package from the compiled executable
make clean	Clean the platform, but do not touch libmeg4
make distclean	Clean everything
USE_INIT=1 make	Compile code to make it suitable for /sbin/init
FLOPPYDEV=xx make	Select the floppy device (default /dev/sda1, init only)
LANG=xx make	Select interface's language (default en, init only)
KBDMAP=xx make	Select keyboard layout map (default us)
DEBUG=1 make	Compile with debug information

You must run this meg4 with the -d flag and specify a directory where the floppies are stored.

With USE_INIT=1, there's no command line, so the floppy directory has to be hardcoded, use the FLOPPYDEV environment variable to change the default. This is not an actual floppy device file (like /dev/fd0), rather it should point to a partition device with a FAT file system and with a directory named MEG-4 where the floppy images are kept. Because for init there are no environment variables either, the interface's language (specified in the LANG environment variable) is also taken and hardcoded into the binary at compilation time.

The Linux kernel's event interface does not and cannot support switchable X11 keyboard layouts, so you must compile in a keyboard mapping manually. You can choose any of the existing header files, for example KBDMAP=gb make. To create a new layout mapping, just copy us.h and edit it. You only have to fill in keys for which you want an UTF-8 character to be produced, special keys like Esc, Enter, F1 etc. are handled regardless. If not specified, defaults to US / International keyboard mapping.

No matter what layout you choose, you can always switch to US / International layout by pressing Shift+Alt in run-time (that layout has Latin letters and all the symbols necessary for programming in the C and BASIC languages).

To sum it up: USE_INIT=1 KBDMAP=hu LANG=hu FLOPPYDEV=/dev/sda1 make

Then copy the meg4 binary to the root fs as init and get it loaded by a Linux kernel as the first and only user space process.