ipl for DoC for ASUS CUA

src/northbridge/acer/m1631/ipl.S

@@ -0,0 +1,73 @@
+/* wow, the acer way to to this hurts. So we do it our way:
+ * 32-bit test not needed. 
+ */
+/* the MCR is 32-bits. You set it, it programs SDRAM. 
+ * first check: get Column address size (CAS)
+ * Start out assuming that it is 8 bits, then grow. 
+ * nicely, if we put the 32-bit MCR value in %ecs, we can 
+ * ror it 16 bits, and as we grow the CAS, we just inc cs, and that will
+ * set the right value. 
+ */
+
+	movl	$INIT_MCR,  %ecx
+	mov	$0x6c, %al
+	CALL_SP PCI_WRITE($0x6c)
+	rorl	$16, %ecx
+	/* test 8 bit CAS */
+	clrb	0
+	movb	$1, 0x800
+	tstb	0
+	jnz	sizeram
+	inc	%cl
+	movb	$1, 0x1000
+	tstb	0
+	jnz	sizeram
+	inc	%cl
+	movb	$1, 0x2000
+	tstb	0
+	jnz	sizeram
+	inc	%cl
+	
+	
+	rorl	$16, %ecx
+	/* clear the 'no multi page' bit. */
+	andw	$0xefff, %cx
+	mov	$0x6c, %al
+	CALL_SP PCI_WRITE($0x6c)
+/* size is now in cx[19:16] */
+/* now size the dram */
+/* you had best have at least 32M; that's as small as we go */
+/* rorr 20 the ecx value, to get row size into lsb */
+	clrb	0
+	ror	$20, %ecx
+	movl	$0x400000, %esi
+1: 
+	movb	$1, [esi]
+	inc	%cl
+	jz	1b
+/* size is now in esi */
+/* %ecx has setting for register */
+	rol	$20, %ecx
+/* set 4 banks. */
+	orb	$1, %cl
+	mov	$0x6c, %al
+	CALL_SP PCI_WRITE($0x6c)
+/* bank detect */
+/* you don't need to even care how large CAS is. 
+ * Just set 4-bank mode, and set non-zero numbers into a few places. 
+ * if the byte at 0 changes, you have two banks. Trivial.
+ */
+	clrb	0
+	movb	$1, 0x1000
+	movb	$1, 0x2000
+	movb	$1, 0x4000
+	tstb	0
+	jz	1f /* only one bank */
+	orl	$80000, %ecx
+1: 
+	/* clear 4 banks */
+	andb	$0xfe, %cl
+	mov	$0x6c, %al
+	CALL_SP PCI_WRITE($0x6c)
+	/* at this point, dram slot 0 is up.  we hope. */
+