1 files changed, 84 insertions, 0 deletions
diff --git a/board/sc520_spunk/sc520_spunk_asm16.S b/board/sc520_spunk/sc520_spunk_asm16.S
new file mode 100644
index 0000000..cdcbbbe
--- /dev/null
+++ b/board/sc520_spunk/sc520_spunk_asm16.S
@@ -0,0 +1,84 @@
+/*
+ * (C) Copyright 2002
+ * Daniel Engström, Omicron Ceti AB <daniel@omicron.se>.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/*
+ * 16bit initialization code.
+ * This code have to map the area of the boot flash
+ * that is used by U-boot to its final destination.
+ */
+
+.text
+.section .start16, "ax"
+.code16
+.globl board_init16
+board_init16:
+	/* Alias MMCR to 0xdf000 */
+	movw	$0xfffc, %dx
+	movl	$0x800df0cb, %eax	
+	outl	%eax, %dx		
+	
+	/* Set ds to point to MMCR alias */
+	movw	$0xdf00, %ax		
+	movw	%ax, %ds		 
+		
+	/* Map the entire flash at 0x38000000  
+	 * (with BOOTCS and PAR14, use 0xabfff800 for ROMCS1) */
+	movl    $0xc0, %edi
+        movl	$0x8bfff800, %eax
+        movl	%eax, (%di)		
+
+	/* Disable SDRAM write buffer */
+	movw    $0x40,%di
+        xorw    %ax,%ax
+        movb    %al, (%di)              
+
+	/* Disabe MMCR alias */
+	movw	$0xfffc, %dx
+	movl	$0x000000cb, %eax	
+	outl	%eax, %dx		
+	
+	/* the return address is stored in bp */
+	jmp	*%bp
+	
+
+.section .bios, "ax"
+.code16
+.globl realmode_reset
+realmode_reset:
+	/* Alias MMCR to 0xdf000 */
+	movw	$0xfffc, %dx
+	movl	$0x800df0cb, %eax	
+	outl	%eax, %dx		
+	
+	/* Set ds to point to MMCR alias */
+	movw	$0xdf00, %ax		
+	movw	%ax, %ds		 
+		
+	/* issue software reset thorugh MMCR */
+	movl    $0xd72, %edi
+        movb	$0x01, %al
+        movb	%al, (%di)		
+
+1:	hlt
+	jmp	1
+