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/*******************************************************************************
*
* Filename: arm_init.s
*
* Initialization for C-environment and basic operation. Adapted from
* ATMEL cstartup.s.
*
* Revision information:
*
* 20AUG2004 kb_admin initial creation
* 12JAN2005 kb_admin updated for 16KB eeprom
* Atmel stack prevents loading full size at once
*
* BEGIN_KBDD_BLOCK
* No warranty, expressed or implied, is included with this software. It is
* provided "AS IS" and no warranty of any kind including statutory or aspects
* relating to merchantability or fitness for any purpose is provided. All
* intellectual property rights of others is maintained with the respective
* owners. This software is not copyrighted and is intended for reference
* only.
* END_BLOCK
*
* $FreeBSD: release/9.1.0/sys/boot/arm/at91/libat91/arm_init.S 165397 2006-12-20 18:16:49Z imp $
******************************************************************************/
.equ TWI_EEPROM_SIZE, 0x3000
.equ ARM_MODE_USER, 0x10
.equ ARM_MODE_FIQ, 0x11
.equ ARM_MODE_IRQ, 0x12
.equ ARM_MODE_SVC, 0x13
.equ ARM_MODE_ABORT, 0x17
.equ ARM_MODE_UNDEF, 0x1B
.equ ARM_MODE_SYS, 0x1F
.equ I_BIT, 0x80
.equ F_BIT, 0x40
.equ T_BIT, 0x20
/*
* Stack definitions
*
* Start near top of internal RAM.
*/
.equ END_INT_SRAM, 0x4000
.equ SVC_STACK_START, (END_INT_SRAM - 0x4)
.equ SVC_STACK_USE, 0x21800000
start:
/* vectors - must reside at address 0 */
/* the format of this table is defined in the datasheet */
B InitReset @; reset
undefvec:
B undefvec @; Undefined Instruction
swivec:
B swivec @; Software Interrupt
pabtvec:
B pabtvec @; Prefetch Abort
dabtvec:
B dabtvec @; Data Abort
rsvdvec:
#ifdef BOOT_IIC
.long (TWI_EEPROM_SIZE >> 9)
#else
#ifdef BOOT_BWCT
.long ((528 << 17) | (13 << 13) | (12 * 2))
#else
.long ((1056 << 17) | (13 << 13) | (12 * 2))
#endif
#endif
irqvec:
ldr pc, [pc,#-0xF20] @; IRQ : read the AIC
fiqvec:
B fiqvec @; FIQ
InitReset:
/* Set stack and init for SVC */
ldr r1, = SVC_STACK_START
mov sp, r1 @; Init stack SYS
msr cpsr_c, #(ARM_MODE_SVC | I_BIT | F_BIT)
mov sp, r1 @ ; Init stack SYS
/* Perform system initialization */
.extern _init
bl _init
#ifndef BOOT_BOOT0
ldr r1, = SVC_STACK_USE
mov sp, r1 @ ; Move the stack to SDRAM
#endif
/* Start execution at main */
.extern main
_main:
__main:
bl main
/* main should not return. If it does, spin forever */
infiniteLoop:
b infiniteLoop
#ifdef BOOT_COMMANDS
/* the following section is used to store boot commands in */
/* non-volatile memory. */
.global BootCommandSection
BootCommandSection:
#ifdef SUPPORT_LINUX
.string "Bootloader for KB9202 Evaluation Board."
.string "c 0x20210000 0x10100000 0x80000 "
.string "m 0 0 0 0 0 0 "
.string "t 0x20000100 console=ttyS0,115200 root=/dev/ram rw initrd=0x20210000,654933"
.string "e 0x10000000 "
.string " "
#else
#if 1
.string "m 42 53 44 0 0 1"
.string "ip 206 168 13 194"
.string "server_ip 206 168 13 207"
.string "tftp 0x20000000 kernel.bin"
.string "e 0x20000000"
#else
.string "m 42 53 44 0 0 1"
.string "k 0x20000000"
.string "e 0x20000000"
#endif
.word 0
#endif
#endif