#include?“setup.h“

extern?void?uart0_init（void）;
extern?void?nand_read（unsigned?int?addr?unsigned?char?*buf?unsigned?int?len）;
extern?void?puts（char?*str）;
extern?void?puthex（unsigned?int?val）;


static?struct?tag?*params;

void?setup_start_tag（void）
{
	params?=?（struct?tag?*）0x30000100;

	params->hdr.tag?=?ATAG_CORE;
	params->hdr.size?=?tag_size?（tag_core）;

	params->u.core.flags?=?0;
	params->u.core.pagesize?=?0;
	params->u.core.rootdev?=?0;

	params?=?tag_next?（params）;
}

void?setup_memory_tags（void）
{
	params->hdr.tag?=?ATAG_MEM;
	params->hdr.size?=?tag_size?（tag_mem32）;
	
	params->u.mem.start?=?0x30000000;
	params->u.mem.size??=?64*1024*1024;
	
	params?=?tag_next?（params）;
}

int?strlen（char?*str）
{
	int?i?=?0;
	while?（str[i]）
	{
		i++;
	}
	return?i;
}

void?strcpy（char?*dest?char?*src）
{
	while?（（*dest++?=?*src++）?!=?‘\0‘）;
}

void?setup_commandline_tag（char?*cmdline）
{
	int?len?=?strlen（cmdline）?+?1;
	
	params->hdr.tag??=?ATAG_CMDLINE;
	params->hdr.size?=?（sizeof?（struct?tag_header）?+?len?+?3）?>>?2;

	strcpy?（params->u.cmdline.cmdline?cmdline）;

	params?=?tag_next?（params）;
}

void?setup_end_tag（void）
{
	params->hdr.tag?=?ATAG_NONE;
	params->hdr.size?=?0;
}


int?main（void）
{
	void?（*theKernel）（int?zero?int?arch?unsigned?int?params）;
	volatile?unsigned?int?*p?=?（volatile?unsigned?int?*）0x30008000;

	/*?0.?幫內(nèi)核設置串口:?內(nèi)核啟動的開始部分會從串口打印一些信息但是內(nèi)核一開始沒有初始化串口?*/
	uart0_init（）;
	
	/*?1.?從NAND?FLASH里把內(nèi)核讀入內(nèi)存?*/
	puts（“Copy?kernel?from?nand\n\r“）;
	nand_read（0x60000?（unsigned?char?*）0x30008000?0x500000）;
	puthex（0x12345678）;
	puts（“\n\r“）;
	puthex（*p）;
	puts（“\n\r“）;

	/*?2.?設置參數(shù)?*/
	puts（“Set?boot?params\n\r“）;
	setup_start_tag（）;
	setup_memory_tags（）;
	setup_commandline_tag（“noinitrd?root=/dev/mtdblock3?init=/linuxrc?console=ttySAC0“）;
	setup_end_tag（）;

	/*?3.?跳轉(zhuǎn)執(zhí)行?*/
	puts（“Boot?kernel\n\r“）;
	theKernel?=?（void?（*）（int?int?unsigned?int））0x30008000;
	theKernel（0?1999?0x30000100）;??
	/*?
	?*??mov?r0?#0
	?*??ldr?r1?=1999
	?*??ldr?r2?=0x30000100
	?*??mov?pc?#0x30008000?
	?*/

	puts（“Error!\n\r“）;
	/*?如果一切正常?不會執(zhí)行到這里?*/

	return?-1;
}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2014-05-23?03:04??my_bootloader\
?????文件?????????500??2014-05-23?01:48??my_bootloader\Makefile
?????文件????????2216??2014-05-23?03:04??my_bootloader\boot.bin
?????文件????????2260??2014-05-23?03:04??my_bootloader\boot.c
?????文件???????25076??2014-05-23?03:04??my_bootloader\boot.dis
?????文件???????36783??2014-05-23?03:04??my_bootloader\boot.elf
?????文件?????????255??2014-05-23?01:48??my_bootloader\boot.lds
?????文件????????2392??2014-05-23?03:04??my_bootloader\boot.o
?????文件????????4713??2014-05-23?01:48??my_bootloader\init.c
?????文件????????2892??2014-05-23?03:04??my_bootloader\init.o
?????文件????????6222??2014-05-23?01:48??my_bootloader\setup.h
?????文件????????1601??2014-05-23?01:48??my_bootloader\start.S
?????文件????????1084??2014-05-23?03:04??my_bootloader\start.o