Initial checkin for supermicro p4dc6

This also includes a bunch of my pending work including
- Updated serial code so we can compile in different serial port speeds
- Updates to the build system so that:
  - Makefile.settings holds all of the settings of the config variables
  - ldoptions and cpuflags are generated automatically with perl scripts
  - src/config/Config holds all of the architecture neutral make file settings
- Initial work on the P4 including how to use cache as ram
- Update to the ioapic code for the P4 because it delivers irqs on the system
  bus instead of an out of band bus
- Updated version of printf that doesn't need an intermediate buffer
  - logbuf_subr now handles the case when we want to use a log buffer
- video_subr handles the preliminary code for writing to a video device.
- Pending changes for the L440GX are merged in as well (hopefully I haven't
  messed then up since they were written).

src/ram/ramtest.inc

@@ -1,4 +1,3 @@
-
 	/*
 	 * This is much more of a "Is my SDRAM properly configured?"
 	 * test than a "Is my SDRAM faulty?" test.  Not all bits
@@ -6,6 +5,7 @@
 	 */
 	
 	jmp	rt_skip
+	.section ".rodata"
 
 rt_test:	.string "Testing SDRAM : "
 rt_fill:	.string "SDRAM fill:\r\n"
@@ -13,6 +13,7 @@ rt_verify:	.string "SDRAM verify:\r\n"
 rt_toomany:	.string "Too many errors.\r\n"
 rt_done:	.string "Done.\r\n"
 	
+	.text
 ramtest:
 #ifdef RAMTEST
 	mov %eax, %esi