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/*
* (C) Copyright 2006 Embedded Artists AB <www.embeddedartists.com>
*
* Slight modifications made to support the SMN42 board from Siemens.
* 2007 Gary Jennejohn garyj@denx.de
*
* 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
*/
#include <config.h>
#include <version.h>
#include <asm/arch/hardware.h>
/* some parameters for the board */
/* setting up the CPU-internal memory */
#define SRAM_START 0x40000000
#define SRAM_SIZE 0x00004000
#define BCFG0_VALUE 0x1000ffef
#define BCFG1_VALUE 0x10005D2F
#define BCFG2_VALUE 0x10005D2F
/*
* For P0.18 to set ZZ to the SRAMs to 1. Also set P0.2 (SCL) and P0.3 (SDA)
* for the bit-banger I2C driver correctly.
*/
#define IO0_VALUE 0x4000C
_TEXT_BASE:
.word TEXT_BASE
MEMMAP_ADR:
.word MEMMAP
BCFG0_ADR:
.word BCFG0
_BCFG0_VALUE:
.word BCFG0_VALUE
BCFG1_ADR:
.word BCFG1
_BCFG1_VALUE:
.word BCFG1_VALUE
BCFG2_ADR:
.word BCFG2
_BCFG2_VALUE:
.word BCFG2_VALUE
IO0DIR_ADR:
.word IO0DIR
_IO0DIR_VALUE:
.word IO0_VALUE
IO0SET_ADR:
.word IO0SET
_IO0SET_VALUE:
.word IO0_VALUE
PINSEL2_ADR:
.word PINSEL2
PINSEL2_MASK:
.word 0x00000000
PINSEL2_VALUE:
.word 0x0F804914
.extern _start
.globl lowlevel_init
lowlevel_init:
/* set up memory control register for bank 0 */
ldr r0, _BCFG0_VALUE
ldr r1, BCFG0_ADR
str r0, [r1]
/* set up memory control register for bank 1 */
ldr r0, _BCFG1_VALUE
ldr r1, BCFG1_ADR
str r0, [r1]
/* set up memory control register for bank 2 */
ldr r0, _BCFG2_VALUE
ldr r1, BCFG2_ADR
str r0, [r1]
/* set IO0DIR to make P0.2, P0.3 and P0.18 outputs */
ldr r0, _IO0DIR_VALUE
ldr r1, IO0DIR_ADR
str r0, [r1]
/* set P0.18 to 1 */
ldr r0, _IO0SET_VALUE
ldr r1, IO0SET_ADR
str r0, [r1]
/* set up PINSEL2 for bus-pins */
ldr r0, PINSEL2_ADR
ldr r1, [r0]
ldr r2, PINSEL2_MASK
ldr r3, PINSEL2_VALUE
and r1, r1, r2
orr r1, r1, r3
str r1, [r0]
/* move vectors to beginning of SRAM */
mov r2, #SRAM_START
mov r0, #0 /*_start*/
ldmneia r0!, {r3-r10}
stmneia r2!, {r3-r10}
ldmneia r0, {r3-r9}
stmneia r2, {r3-r9}
/* Set-up MEMMAP register, so vectors are taken from SRAM */
ldr r0, MEMMAP_ADR
mov r1, #0x02 /* vectors re-mapped to static RAM */
str r1, [r0]
/* everything is fine now */
mov pc, lr
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