1/*******************************************************************************
2 *
3 * Filename: arm_init.s
4 *
5 * Initialization for C-environment and basic operation. Adapted from
6 * ATMEL cstartup.s.
7 *
8 * Revision information:
9 *
10 * 20AUG2004 kb_admin initial creation
11 * 12JAN2005 kb_admin updated for 16KB eeprom
12 * Atmel stack prevents loading full size at once
13 *
14 * BEGIN_KBDD_BLOCK
15 * No warranty, expressed or implied, is included with this software. It is
16 * provided "AS IS" and no warranty of any kind including statutory or aspects
17 * relating to merchantability or fitness for any purpose is provided. All
18 * intellectual property rights of others is maintained with the respective
19 * owners. This software is not copyrighted and is intended for reference
20 * only.
21 * END_BLOCK
22 *
| 1/*******************************************************************************
2 *
3 * Filename: arm_init.s
4 *
5 * Initialization for C-environment and basic operation. Adapted from
6 * ATMEL cstartup.s.
7 *
8 * Revision information:
9 *
10 * 20AUG2004 kb_admin initial creation
11 * 12JAN2005 kb_admin updated for 16KB eeprom
12 * Atmel stack prevents loading full size at once
13 *
14 * BEGIN_KBDD_BLOCK
15 * No warranty, expressed or implied, is included with this software. It is
16 * provided "AS IS" and no warranty of any kind including statutory or aspects
17 * relating to merchantability or fitness for any purpose is provided. All
18 * intellectual property rights of others is maintained with the respective
19 * owners. This software is not copyrighted and is intended for reference
20 * only.
21 * END_BLOCK
22 *
|
23 * $FreeBSD: head/sys/boot/arm/at91/libat91/arm_init.S 164323 2006-11-16 00:53:28Z imp $
| 23 * $FreeBSD: head/sys/boot/arm/at91/libat91/arm_init.S 165397 2006-12-20 18:16:49Z imp $
|
24 ******************************************************************************/
25
26 .equ TWI_EEPROM_SIZE, 0x3000
27 .equ ARM_MODE_USER, 0x10
28 .equ ARM_MODE_FIQ, 0x11
29 .equ ARM_MODE_IRQ, 0x12
30 .equ ARM_MODE_SVC, 0x13
31 .equ ARM_MODE_ABORT, 0x17
32 .equ ARM_MODE_UNDEF, 0x1B
33 .equ ARM_MODE_SYS, 0x1F
34 .equ I_BIT, 0x80
35 .equ F_BIT, 0x40
36 .equ T_BIT, 0x20
37
38/*
39 * Stack definitions
40 *
41 * Start near top of internal RAM.
42 */
43 .equ END_INT_SRAM, 0x4000
44 .equ SVC_STACK_START, (END_INT_SRAM - 0x4)
45 .equ SVC_STACK_USE, 0x21800000
46
47start:
48
49/* vectors - must reside at address 0 */
50/* the format of this table is defined in the datasheet */
51 B InitReset @; reset
52undefvec:
53 B undefvec @; Undefined Instruction
54swivec:
55 B swivec @; Software Interrupt
56pabtvec:
57 B pabtvec @; Prefetch Abort
58dabtvec:
59 B dabtvec @; Data Abort
60rsvdvec:
61#ifdef BOOT_IIC
62 .long (TWI_EEPROM_SIZE >> 9)
63#else
| 24 ******************************************************************************/
25
26 .equ TWI_EEPROM_SIZE, 0x3000
27 .equ ARM_MODE_USER, 0x10
28 .equ ARM_MODE_FIQ, 0x11
29 .equ ARM_MODE_IRQ, 0x12
30 .equ ARM_MODE_SVC, 0x13
31 .equ ARM_MODE_ABORT, 0x17
32 .equ ARM_MODE_UNDEF, 0x1B
33 .equ ARM_MODE_SYS, 0x1F
34 .equ I_BIT, 0x80
35 .equ F_BIT, 0x40
36 .equ T_BIT, 0x20
37
38/*
39 * Stack definitions
40 *
41 * Start near top of internal RAM.
42 */
43 .equ END_INT_SRAM, 0x4000
44 .equ SVC_STACK_START, (END_INT_SRAM - 0x4)
45 .equ SVC_STACK_USE, 0x21800000
46
47start:
48
49/* vectors - must reside at address 0 */
50/* the format of this table is defined in the datasheet */
51 B InitReset @; reset
52undefvec:
53 B undefvec @; Undefined Instruction
54swivec:
55 B swivec @; Software Interrupt
56pabtvec:
57 B pabtvec @; Prefetch Abort
58dabtvec:
59 B dabtvec @; Data Abort
60rsvdvec:
61#ifdef BOOT_IIC
62 .long (TWI_EEPROM_SIZE >> 9)
63#else
|
| 64#ifdef BOOT_BWCT
65 .long ((528 << 17) | (13 << 13) | (12 * 2))
66#else
|
64 .long ((1056 << 17) | (13 << 13) | (12 * 2))
65#endif
| 67 .long ((1056 << 17) | (13 << 13) | (12 * 2))
68#endif
|
| 69#endif
|
66irqvec:
67 ldr pc, [pc,#-0xF20] @; IRQ : read the AIC
68fiqvec:
69 B fiqvec @; FIQ
70
71InitReset:
72
73/* Set stack and init for SVC */
74 ldr r1, = SVC_STACK_START
75 mov sp, r1 @; Init stack SYS
76
77 msr cpsr_c, #(ARM_MODE_SVC | I_BIT | F_BIT)
78 mov sp, r1 @ ; Init stack SYS
79
80/* Perform system initialization */
81
82 .extern _init
83 bl _init
84#ifndef BOOT_BOOT0
85 ldr r1, = SVC_STACK_USE
86 mov sp, r1 @ ; Move the stack to SDRAM
87#endif
88
89/* Start execution at main */
90 .extern main
91_main:
92__main:
93 bl main
94/* main should not return. If it does, spin forever */
95infiniteLoop:
96 b infiniteLoop
97
98#ifdef BOOT_COMMANDS
99/* the following section is used to store boot commands in */
100/* non-volatile memory. */
101
102 .global BootCommandSection
103BootCommandSection:
104#ifdef SUPPORT_LINUX
105 .string "Bootloader for KB9202 Evaluation Board."
106 .string "c 0x20210000 0x10100000 0x80000 "
107 .string "m 0 0 0 0 0 0 "
108 .string "t 0x20000100 console=ttyS0,115200 root=/dev/ram rw initrd=0x20210000,654933"
109 .string "e 0x10000000 "
110 .string " "
111#else
112#if 1
113 .string "m 42 53 44 0 0 1"
114 .string "ip 206 168 13 194"
115 .string "server_ip 206 168 13 207"
116 .string "tftp 0x20000000 kernel.bin"
117 .string "e 0x20000000"
118#else
119 .string "m 42 53 44 0 0 1"
120 .string "k 0x20000000"
121 .string "e 0x20000000"
122#endif
123 .word 0
124#endif
125#endif
| 70irqvec:
71 ldr pc, [pc,#-0xF20] @; IRQ : read the AIC
72fiqvec:
73 B fiqvec @; FIQ
74
75InitReset:
76
77/* Set stack and init for SVC */
78 ldr r1, = SVC_STACK_START
79 mov sp, r1 @; Init stack SYS
80
81 msr cpsr_c, #(ARM_MODE_SVC | I_BIT | F_BIT)
82 mov sp, r1 @ ; Init stack SYS
83
84/* Perform system initialization */
85
86 .extern _init
87 bl _init
88#ifndef BOOT_BOOT0
89 ldr r1, = SVC_STACK_USE
90 mov sp, r1 @ ; Move the stack to SDRAM
91#endif
92
93/* Start execution at main */
94 .extern main
95_main:
96__main:
97 bl main
98/* main should not return. If it does, spin forever */
99infiniteLoop:
100 b infiniteLoop
101
102#ifdef BOOT_COMMANDS
103/* the following section is used to store boot commands in */
104/* non-volatile memory. */
105
106 .global BootCommandSection
107BootCommandSection:
108#ifdef SUPPORT_LINUX
109 .string "Bootloader for KB9202 Evaluation Board."
110 .string "c 0x20210000 0x10100000 0x80000 "
111 .string "m 0 0 0 0 0 0 "
112 .string "t 0x20000100 console=ttyS0,115200 root=/dev/ram rw initrd=0x20210000,654933"
113 .string "e 0x10000000 "
114 .string " "
115#else
116#if 1
117 .string "m 42 53 44 0 0 1"
118 .string "ip 206 168 13 194"
119 .string "server_ip 206 168 13 207"
120 .string "tftp 0x20000000 kernel.bin"
121 .string "e 0x20000000"
122#else
123 .string "m 42 53 44 0 0 1"
124 .string "k 0x20000000"
125 .string "e 0x20000000"
126#endif
127 .word 0
128#endif
129#endif
|