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 * $FreeBSD$
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
67		.long	((1056 << 17) | (13 << 13) | (12 * 2))
68#endif
69#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
130