Some notes about openboot.

As I keep looking for the commands to do anything...

Next step is to figure out network booting and set up an easy way to
test haiku_loader.

docs/develop/kernel/arch/sparc/openboot.txt

@@ -0,0 +1,53 @@
+Openboot is Sun's implementation of Open Firmware. So we should be able to share
+a lot of code with the PowerPC port. There are some differences however.
+
+Executable format
+=================
+
+PowerPC uses COFF. Sparc uses a.out, which is a lot simpler. According to the
+spec, some fields should be zeroed out, but they say implementation may chose
+to allow other values, so it's possible a standard a.out file would work as
+well.
+
+Openfirmware prompt
+===================
+
+To get the prompt on display, use STOP+A at boot until you get the "ok" prompt.
+On some machines, if no keyboard is detected, the ROM will assume it is set up
+in headless mode, and will expect a BREAK+A on the serial port.
+
+STOP+N resets all variables to default values (in case you messed up input or
+output, for example).
+
+Useful commands
+===============
+
+Disable autoboot to get to the openboot prompt and stop there
+-------------------------------------------------------------
+
+setenv auto-boot? false
+
+Configuring for keyboard/framebuffer io
+---------------------------------------
+
+setenv screen-#columns 160
+setenv screen-#rows 49
+setenv output-device screen:r1920x1080x60
+setenv input-device keyboard
+
+Configuring openboot for serial port
+------------------------------------
+
+setenv ttya-mode 38400,8,n,1,-
+setenv output-device ttya
+setenv input-device ttya
+reset
+
+Boot from network
+-----------------
+
+rarp:
+boot net
+
+dhcp:
+boot net:dhcp