lowlevel_init.S
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/*
* board/mx1ads/lowlevel_init.S
*
* (c) Copyright 2004
* Techware Information Technology, Inc.
* http://www.techware.com.tw/
*
* Ming-Len Wu <minglen_wu@techware.com.tw>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <config.h>
#include <version.h>
#define SDCTL0 0x221000
#define SDCTL1 0x221004
_TEXT_BASE:
.word CONFIG_SYS_TEXT_BASE
.globl lowlevel_init
lowlevel_init:
/* memory controller init */
ldr r1, =SDCTL0
/* Set Precharge Command */
ldr r3, =0x92120200
/* ldr r3, =0x92120251
*/
str r3, [r1]
/* Issue Precharge All Commad */
ldr r3, =0x8200000
ldr r2, [r3]
/* Set AutoRefresh Command */
ldr r3, =0xA2120200
str r3, [r1]
/* Issue AutoRefresh Command */
ldr r3, =0x8000000
ldr r2, [r3]
ldr r2, [r3]
ldr r2, [r3]
ldr r2, [r3]
ldr r2, [r3]
ldr r2, [r3]
ldr r2, [r3]
ldr r2, [r3]
/* Set Mode Register */
ldr r3, =0xB2120200
str r3, [r1]
/* Issue Mode Register Command */
ldr r3, =0x08111800 /* Mode Register Value */
ldr r2, [r3]
/* Set Normal Mode */
ldr r3, =0x82124200
str r3, [r1]
/* everything is fine now */
mov pc, lr