added doc and std flash reading code

src/include/rom/doc_mil.inc

@@ -0,0 +1,89 @@
+	xorw	%sp, %sp			# clear %sp
+	xorw	%dx, %dx			# clear %dx, start of RAM
+	movw	$0x800, %si			# point %si to CDSN Data area
+	movw	$0x1000, %di			# point %di to CDSN Control area
+	movw	$DOC_SPL_START_PAGE, %bp	# start page of LinuxBIOS
+
+	movb	$0x84, %al			# Reset DOC Millennium
+	call	doc_reset
+
+	movb	$0x85, %al			# Turn into Normal Mode
+	call	doc_reset
+
+read_next_page:
+	movw	$0x1000, %di			# point %di to CDSN Control area
+
+flash_command:
+	movb	$0x03, 0x04(%di)		# start command cycle
+	movb	$0x00, (%si)			# issue flash command Read00
+	call	doc_cycle_end
+
+	movw	%bp, %bx			# %bp is current page number
+
+flash_address:
+#ifndef SIS550_BUG
+	shll	$0x08, %ebx
+	movb	$0x03, %cl			# this one is DANGEROUS but I am
+						# sure the upper 3 bytes == 0x00
+
+	movb	$0x05, 0x04(%di)		# start address cycle
+0:
+	movb	%bl, (%si)			# write address to CDSNIO
+	shrw	$0x08, %bx			# shift next address byte
+	loop	0b
+#else /* SIS550_BUG */
+
+	movb	$0x05, 0x04(%di)		# start address cycle
+
+	movb	$0x00, (%si)
+	movw	%bp, %bx
+	movb	%bl, (%si)
+	movb	%bh, (%si)
+#endif
+
+	call	doc_cycle_end
+
+wait_for_flash_ready:
+	call	doc_delay
+
+	testb	$0x80, 0x04(%di)		# is flash ready ?
+	jz	wait_for_flash_ready
+
+	movb	0x1d(%di), %al			# init read pipeline
+	movw	$0x100, %cx			# 1 page = 512 bytes
+	movw	$0x800, %si			# point %si to CDSN Data area
+	movw	%dx, %di			# restore saved current destination
+	rep
+	movsw
+
+	movw	%di, %dx			# save current destination
+	incw	%bp				# increse current page number
+	cmpw	$(DOC_SPL_START_PAGE + DOC_SPL_SIZE_IN_PAGE), %bp
+						# moved enough data ??
+	jl	read_next_page			# no, read next page
+
+	jmp	doc_mil_end			# jump to SPL vector
+
+doc_reset:
+	/* Input: AL = value write to DOC_CONTROL register
+	   Clobberd: CX */
+	movb	%al, 0x02(%di)			# write DoC Control retister
+	movb	%al, 0x02(%di)			# twice
+	ret					# End of doc_reset
+
+doc_cycle_end:
+	movb	$0x00, 0x1e(%di)		# flush write pepeline
+	movb	$0x01, 0x04(%di)		# end command cycle
+	ret
+
+	/* delay by reding NOP register before polling the FLASH READY bit,
+	   this is inlined to save a call/ret pair */
+doc_delay:
+	movb	$0x04, %cl			# this one is DANGEROUS but I am
+						# sure the upper 3 bytes == 0x00
+0:
+	movb	0x20(%di), %al			# read DOC NOP retisger
+	loop	0b				# four times
+	ret
+
+doc_mil_end:

src/include/rom/std_flash.inc

@@ -0,0 +1,10 @@
+	movw	$0xf000, %ax
+	movw	%ax, %ds 
+	xorw	%si, %si
+	xorw	%di, %di
+	movw	$0xffff, %cx
+	rep
+	movsb
+
+	movw	$DOC_WIN_SEG, %ax
+	movw	%ax, %ds

src/northsouthbridge/sis/630/unlock_flash.inc

@@ -0,0 +1,7 @@
+	movw	$sis950_init_table, %si		# unlock SiS 950 LPC
+	movw	$0x05, %cx			# select Clock Selection
+	movw	$0x2e, %dx			# and Flash ROM I/F 
+	rep
+	outsb
+	movb	$0xfd, %al			# enable write, CLKIN = 24 MHZ
+	outb	%al, $0x2f

src/northsouthbridge/sis/730/unlock_flash.inc

@@ -0,0 +1,7 @@
+	movw	$sis950_init_table, %si		# unlock SiS 950 LPC
+	movw	$0x05, %cx			# select Clock Selection
+	movw	$0x2e, %dx			# and Flash ROM I/F 
+	rep
+	outsb
+	movb	$0xfd, %al			# enable write, CLKIN = 24 MHZ
+	outb	%al, $0x2f