run helloworld on s3c2410 using skyeye without OS

终于将s3c2410在skyeye上跑起来了，没有操作系统的底层支持，实现的是直接向端口写数据。

hello.c

/*

 * hello.c

 * just a function used to output "helloworld" to uart 

 * 

 * author: SU Hang

 * date:   2004-08-28

 */

void hello(void)

{

unsigned long n = 0;

int i;

char * hellostr="helloworld";

long* paddr=(long*)0x50000020;

// for timer delay

while (n++ < 0xffff);

for(i=0;i<10;i++)

{

* paddr=hellostr[i];

}

return;

}

hello.lds

/*

 * hello.lds

 * ld script for helloforSkyeye

 * 

 * author: SU Hang

 * Date:   2004-08-28

 */

OUTPUT_ARCH(arm)

ENTRY(begin)

SECTIONS

{

. = 0x33f00000;

.text : 

{

*(.text) 

*(.rodata)

}

. = ALIGN(8192);

.data : {*(.data)}

.bss : {*(.bss)}

        /* Stabs debugging sections.    */

        .stab 0 : { *(.stab) }

        .stabstr 0 : { *(.stabstr) }

        .stab.excl 0 : { *(.stab.excl) }

        .stab.exclstr 0 : { *(.stab.exclstr) }

        .stab.index 0 : { *(.stab.index) }

        .stab.indexstr 0 : { *(.stab.indexstr) }

        .comment 0 : { *(.comment) }

        .debug_abbrev 0 : { *(.debug_abbrev) }

        .debug_info 0 : { *(.debug_info) }

        .debug_line 0 : { *(.debug_line) }

        .debug_pubnames 0 : { *(.debug_pubnames) }

        .debug_aranges 0 : { *(.debug_aranges) }

}

skyeye.conf

#skyeye config file sample

cpu: arm920t

arch: arm

mach: s3c2410x

mem_bank: map=M, type=RW, addr=0x33f00000, size=0x01000000

mem_bank: map=I, type=RW, addr=0x48000000, size=0x20000000

#log: logon=0, logfile=./sk1.log, start=0, end=200000

# for UART

uart: mod=term

start.S

/*

 *  start.S 

 *  very simple code for ARM 7TDMI 

 *

 *  author: SU Hang 

 *  date:   2004-08-28 

 */

 

.text

.align 4

.global begin

.type begin, function

begin:

@set up irq stack

mov r0, #0xd2                @ make irq mode with all irqs disabled

msr cpsr, r0

ldr sp, =irq_stack           @ set sp_irq = irq_stack

bl hello

b begin

.data

.align  4

irq_stack:

.space 4096

将上面的几个文件放置在同一个文件夹下面，然后依次执行下面的命令：

make clean

make

skyeye -e hello -c skyeye.conf

于是helloworld开始在s3c2410上跑了起来。

xuqiang@ubuntu:~/Desktop/Hello4Skyeye$ skyeye -e hello -c skyeye.conf

SkyEye is an Open Source project under GPL. All rights of different parts or 

modules are reserved by their author. Any modification or redistributions of

SkyEye should note remove or modify the annoucement of SkyEye copyright. 

Get more information about it, please visit the homepage http://www.skyeye.org.

Type "help" to get command list. 

 (skyeye)start

cpu info: armv4, arm920t, 41009200, ff00fff0, 2 

arch: arm

In do_mach_option, mach info: name s3c2410x, mach_init addr 0x17c970

uart_mod:0, desc_in:, desc_out:, converter:

SKYEYE: use arm920t mmu ops

exec file "hello"'s format is elf32-i386.

load section .text: addr = 0x33f00000  size = 0x00000077.

load section .glue_7t: addr = 0x33f00078  size = 0x00000000.

load section .glue_7: addr = 0x33f00078  size = 0x00000000.

load section .data: addr = 0x33f02000  size = 0x00001000.

not load section .bss: addr = 0x33f03000  size = 0x00000000 .

not load section .debug_abbrev: addr = 0x00000000  size = 0x0000004e .

not load section .debug_info: addr = 0x00000000  size = 0x00000172 .

not load section .debug_line: addr = 0x00000000  size = 0x00000087 .

not load section .debug_pubnames: addr = 0x00000000  size = 0x0000001c .

not load section .debug_aranges: addr = 0x00000000  size = 0x00000020 .

In SIM_start, Set PC to the address 0x33f00000

(skyeye)(running)helloworldhelloworldhelloworldhelloworldhelloworldhelloworld

熟悉的helloworld，呵呵。。。