* Patch by Daniel Engström, 13 Nov 2002:

  Add support for i386 architecture and AMD SC520 board

* Patch by Pierre Aubert, 12 Nov 2002:
  Add support for DOS filesystem and booting from DOS floppy disk

1 files changed, 86 insertions, 0 deletions

diff --git a/board/sc520_cdp/sc520_cdp_asm.S b/board/sc520_cdp/sc520_cdp_asm.S
new file mode 100644
index 0000000..1e255fa
--- /dev/null
+++ b/board/sc520_cdp/sc520_cdp_asm.S
@@ -0,0 +1,86 @@
+/*
+ * (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
+ */
+
+/* now setup the General purpose bus to give us access to the LEDs.
+ * We can then use the leds to display status information.
+ */ 
+
+sc520_cdp_registers:
+/* size    offset        value */
+.word 1 ; .word 0x040 ; .long 0x00       /* SDRAM buffer control */
+.word 2 ; .word 0xc08 ; .long 0x0001     /* GP CS offset */
+.word 2 ; .word 0xc09 ; .long 0x0003     /* GP CS width */
+.word 2 ; .word 0xc0a ; .long 0x0001     /* GP CS width */
+.word 2 ; .word 0xc0b ; .long 0x0003     /* GP RD pulse width */
+.word 2 ; .word 0xc0c ; .long 0x0001     /* GP RD offse */
+.word 2 ; .word 0xc0d ; .long 0x0003     /* GP WR pulse width */
+.word 2 ; .word 0xc0e ; .long 0x0001     /* GP WR offset */
+.word 2 ; .word 0xc2c ; .long 0x0000     /* GPIO directionreg */
+.word 2 ; .word 0xc2a ; .long 0x0000     /* GPIO directionreg */
+.word 2 ; .word 0xc22 ; .long 0xffff     /* GPIO pin function 31-16 reg */
+.word 2 ; .word 0xc20 ; .long 0xffff     /* GPIO pin function 15-0 reg */
+.word 2 ; .word 0x0c4 ; .long 0x28000680 /* PAR 15 for access to led 680 */
+.word 0 ; .word 0x000 ; .long 0x00
+
+/* board early intialization */
+.globl early_board_init
+early_board_init:
+        movl    $sc520_cdp_registers,%esi
+init_loop:	
+        movl    $0xfffef000,%edi     /* MMCR base to edi */					
+	movw	(%esi), %bx          /* load sizer to bx */
+	cmpw	$0, %bx              /* if sie is 0 we're done */
+	je	done 
+	xorl	%edx,%edx
+	movw	2(%esi), %dx        /* load MMCR offset to dx */
+	addl	%edx, %edi          /* add offset to base in edi */
+	movl	4(%esi), %eax       /* load value in eax */
+	cmpw	$1, %bx
+	je	byte                 /* byte op? */
+	cmpw	$2, %bx
+	je	word                 /* word op? */
+	movl	%eax, (%edi)         /* must be long, then */
+	jmp	next
+byte:   movb    %al,(%edi)        
+	jmp	next
+word:	movw	%ax,(%edi)
+next:	addl	$8, %esi             /* advance esi */
+	jmp	init_loop
+
+	/* the leds ad 0x80 and 0x680 should now work */
+done:   movb	$0x88, %al
+	out	%al, $0x80
+	movw	$0x680, %dx
+	out	%al, %dx
+
+	jmp 	*%ebp		     /* return to caller */
+
+
+.globl __show_boot_progress
+__show_boot_progress:
+	out	%al, $0x80
+	xchg	%al, %ah
+	movw	$0x680, %dx
+	out	%al, %dx
+	jmp	*%ebp
+