| /* | |
| * (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 "config.h" | |
| #include "hardware.h" | |
| #include <asm/arch/sc520.h> | |
| #include <generated/asm-offsets.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 $GENERATED_SC520_PAR14, %edi | |
| movl $CONFIG_SYS_SC520_BOOTCS_PAR, %eax | |
| movl %eax, (%di) | |
| /* Map PAR for LED, Hex Switches (GPCS6, 20 Bytes @ 0x1000) */ | |
| movl $GENERATED_SC520_PAR15, %edi | |
| movl $CONFIG_SYS_SC520_LLIO_PAR, %eax | |
| movl %eax, (%di) | |
| /* Disabe MMCR alias */ | |
| movw $0xfffc, %dx | |
| movl $0x000000cb, %eax | |
| outl %eax, %dx | |
| jmp board_init16_ret | |
| .section .bios, "ax" | |
| .code16 | |
| .globl realmode_reset | |
| .hidden realmode_reset | |
| .type realmode_reset, @function | |
| 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 |