| /* |
| * (C) Copyright 2008 |
| * Graeme Russ, graeme.russ@gmail.com. |
| * |
| * 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. |
| */ |
| |
| /* #include <asm/ic/sc520_defs.h> */ |
| |
| #include "hardware.h" |
| |
| .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 PAR for Boot Flash (BOOTCS, 512kB @ 0x380000000) */ |
| movl $0x00c0, %edi /* SC520_PAR14 */ |
| movl $0x8bfff800, %eax /* TODO: Check this */ |
| movl %eax, (%di) |
| |
| /* Map PAR for LED, Hex Switches (GPCS6, 20 Bytes @ 0x1000) */ |
| movl $0x00c4, %edi /* SC520_PAR15 */ |
| movl $0x38201000, %eax |
| movl %eax, (%di) |
| |
| /* Disable SDRAM write buffer */ |
| movw $0x0040, %di /* SC520_DBCTL */ |
| 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 |
