|
|
|
|
/*
|
|
|
|
|
* (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
|
