/*
?*?（C）?Copyright?2007-2011
?*?Allwinner?Technology?Co.?Ltd.?
?*?Tom?Cubie?
?*
?*?a?simple?tool?to?generate?bootable?image?for?sunxi?platform.
?*
?*?This?program?is?free?software;?you?can?redistribute?it?and/or
?*?modify?it?under?the?terms?of?the?GNU?General?Public?License?as
?*?published?by?the?Free?Software?Foundation;?either?version?2?of
?*?the?License?or?（at?your?option）?any?later?version.
?*
?*?This?program?is?distributed?in?the?hope?that?it?will?be?useful
?*?but?WITHOUT?ANY?WARRANTY;?without?even?the?implied?warranty?of
?*?MERCHANTABILITY?or?FITNESS?FOR?A?PARTICULAR?PURPOSE.	?See?the
?*?GNU?General?Public?License?for?more?details.
?*
?*?You?should?have?received?a?copy?of?the?GNU?General?Public?License
?*?along?with?this?program;?if?not?write?to?the?Free?Software
?*?Foundation?Inc.?59?Temple?Place?Suite?330?Boston
?*?MA?02111-1307?USA
?*/

#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?

typedef?unsigned?char?u8;
typedef?unsigned?int?u32;

/*?boot?head?definition?from?sun4i?boot?code?*/
typedef?struct?boot_file_head
{
	u32??jump_instruction;???//?one?intruction?jumping?to?real?code
	u8???magic[8];???????????//?=“eGON.BT0“?or?“eGON.BT1“??not?C-style?string.
	u32??check_sum;??????????//?generated?by?PC
	u32??length;?????????????//?generated?by?PC
	u32??pub_head_size;??????//?the?size?of?boot_file_head_t
	u8???pub_head_vsn[4];????//?the?version?of?boot_file_head_t
	u8???file_head_vsn[4];???//?the?version?of?boot0_file_head_t?or?boot1_file_head_t
	u8???Boot_vsn[4];????????//?Boot?version
	u8???eGON_vsn[4];????????//?eGON?version
	u8???platform[8];????????//?platform?information
}boot_file_head_t;

#define?BOOT0_MAGIC?????????????????????“eGON.BT0“
#define?STAMP_VALUE?????????????????????0x5F0A6C39
/*?check?sum?functon?from?sun4i?boot?code?*/
int?gen_check_sum（?void?*boot_buf?）
{
	boot_file_head_t??*head_p;
	u32?length;
	u32?*buf;
	u32?loop;
	u32?i;
	u32?sum;

	head_p?=?（boot_file_head_t?*）boot_buf;
	length?=?head_p->length;
	if（?（?length?&?0x3?）?!=?0?）???????????????????//?must?4-byte-aligned
		return?-1;
	buf?=?（u32?*）boot_buf;
	head_p->check_sum?=?STAMP_VALUE;??????????????//?fill?stamp
	loop?=?length?>>?2;
	/*?calculate?the?sum?*/
	for（?i?=?0?sum?=?0;??i?		sum?+=?buf[i];

	/*?write?back?check?sum?*/
	head_p->check_sum?=?sum;

	return?0;
}

#define?ALIGN（xa）??????__ALIGN_MASK（（x）（typeof（x））（a）-1）
#define?__ALIGN_MASK（xmask）????（（（x）+（mask））&~（mask））

#define?SUN4I_SRAM_SIZE?（24?*?1024）
#define?SRAM_LOAD_MAX_SIZE?（SUN4I_SRAM_SIZE?-?sizeof（boot_file_head_t））
#define?BLOCK_SIZE?512
struct?boot_img?{
	boot_file_head_t?header;
	char?code[SRAM_LOAD_MAX_SIZE];
	char?pad[BLOCK_SIZE];
};

int?main（int?argc?char?*?argv[]）
{
	int?fd_in?fd_out;
	struct?boot_img?img;
	unsigned?file_size?load_size;
	int?count;

	if（argc?		printf（“\tThis?program?makes?an?

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2019-03-07?13:27??gboot-master\
?????文件?????????282??2019-03-07?13:27??gboot-master\Makefile
?????文件?????????328??2019-03-07?13:27??gboot-master\README.md
?????文件?????????112??2019-03-07?13:27??gboot-master\gboot.bin
?????文件???????66780??2019-03-07?13:27??gboot-master\gboot.elf
?????文件?????????338??2019-03-07?13:27??gboot-master\gboot.lds
?????文件????????1266??2019-03-07?13:27??gboot-master\start.S
?????文件????????1544??2019-03-07?13:27??gboot-master\start.o
?????目錄???????????0??2019-03-07?13:27??gboot-master\tools\
?????文件??????????58??2019-03-07?13:27??gboot-master\tools\Makefile
?????文件?????????512??2019-03-07?13:27??gboot-master\tools\gboot-sdcard.bin
?????文件????????9064??2019-03-07?13:27??gboot-master\tools\mksunxiboot
?????文件????????4407??2019-03-07?13:27??gboot-master\tools\mksunxiboot.c