diff options
| author | wdenk <wdenk> | 2002-11-18 00:14:45 +0000 |
|---|---|---|
| committer | wdenk <wdenk> | 2002-11-18 00:14:45 +0000 |
| commit | 2262cfeef91458b01a1bfe3812ccbbfdf8b82807 (patch) | |
| tree | 3657d48c8ce9089fc96682848859d035a1e8f115 /board/sc520_cdp/sc520_cdp_asm16.S | |
| parent | 1d0350ed0b1b0f63e3fb5db6b19397b84a2ea1c7 (diff) | |
* 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
Diffstat (limited to 'board/sc520_cdp/sc520_cdp_asm16.S')
| -rw-r--r-- | board/sc520_cdp/sc520_cdp_asm16.S | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/board/sc520_cdp/sc520_cdp_asm16.S b/board/sc520_cdp/sc520_cdp_asm16.S new file mode 100644 index 0000000000..a3cadcfa54 --- /dev/null +++ b/board/sc520_cdp/sc520_cdp_asm16.S @@ -0,0 +1,62 @@ +/* + * (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 tored in bp */ + jmp *%bp + |