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[kvmfornfv.git] / qemu / roms / openbios / kernel / README

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+
+Welcome to the OpenBIOS forth core "begin again".
+
+Find more information about OpenBIOS at http://www.openbios.org/
+
+This program was written by Patrick Mauritz and Stefan Reinauer in 2003
+For license details on this piece of software, check Documentation/COPYING.
+
+How OpenBIOS works
+------------------
+
+ The OpenBIOS forth core is split into a forth kernel written in C
+ and a forth dictionary which operated on by the kernel.
+
+ When building the forth core, you get different versions of
+ the forth kernel: 
+
+ * a "hosted" unix binary. This binary can be used on a unix system 
+
+   - to execute a forth dictionary from a file. This can be used for
+     testing openbios code in a development environment on a unix host.
+
+   - to create a dictionary file. Such a dictionary file sets up
+     all of the forth language. Primitives are indexed to save relocations.
+
+     The default is to create a forth dictionary forth.dict from
+     forth/start.fs. This file includes all of the basic forth language
+     constructs from forth/bootstrap.fs and starts the interpreter.
+
+     To achieve this, the hosted unix version contains a basic set of
+     forth words coded in C that allow creating a full dictionary.
+
+ * a varying number of target specific binaries. On x86 you can start 
+   openbios for example from GRUB or LinuxBIOS. They are all based on
+   the same forth engine consisting of a dictionary scheduler, primitive 
+   words needed to build the forth environment, 2 stacks and a simple 
+   set of console functions. These binaries can not be started directly
+   in the unix host environment.
+
+Requirements
+------------
+ * gcc
+ * grub or any other multiboot loader to run the standalone
+   binary "openbios.multiboot"
+ 
+Building & Usage
+----------------
+
+ * make
+
+   this builds "openbios.multiboot", the standalone image and "unix", 
+   the hosted image. Additionally it creates a forth dictionary
+   file from forth/start.fs. All generated files are written to 
+   the absolute directory held by the variable BUILDDIR, which defaults
+   to obj-[platform]. Some compile time parameters can be tweaked in
+   include/config.h
+   
+ * use "unix" to create a forth dictionary on your own:
+   $ ./unix -Iforth start.fs
+   creates the file forth.dict from forth source forth/start.fs.
+
+ * use "unix" to run a created dictionary: 
+   $ ./unix forth.dict
+   This is useful for testing
+ 
+ * booting openbios
+   You can boot openbios i.e. in grub. Add the following lines to
+   your menu.lst:
+
+    title openbios
+      kernel (hd0,2)/boot/openbios.multiboot
+      module (hd0,2)/boot/openfirmware.dict
+
+   Note: change (hd0,2) to the partition you copied openbios and
+   forth.dict to.
+
+   To boot OpenBIOS from LinuxBIOS/etherboot, you can either use
+   "openbios" or "openbios.full":
+
+   - openbios is the pure kernel that loads the dictionary from a 
+     hardcoded address in flash memory (0xfffe0000)
+
+   - openbios.full also includes the dictionary directly so that it
+     can be easily used from etherboot or the LinuxBIOS builtin ELF
+     loader without taking care of the dictionary
+
+
+Comments are welcome.
+
+     OpenBIOS team
+
+------------------------------------------------------------------------
+tag: README for openbios forth core