1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
/*
* 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>
*
* 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>
#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
|
