109 lines
4.2 KiB
C
109 lines
4.2 KiB
C
|
/*
|
|||
|
|
* (C) Copyright 2007-2013
|
|||
|
|
* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
|
|||
|
|
* Jerry Wang <wangflord@allwinnertech.com>
|
|||
|
|
*
|
|||
|
|
* See file CREDITS for list of people who contributed to this
|
|||
|
|
* project.
|
|||
|
|
*
|
|||
|
|
* 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 <common.h>
|
|||
|
|
#include <private_uboot.h>
|
|||
|
|
extern char uboot_hash_value[64];
|
|||
|
|
#pragma pack(1)
|
|||
|
|
struct spare_boot_head_t uboot_spare_head =
|
|||
|
|
{
|
|||
|
|
{
|
|||
|
|
/* jump_instruction */
|
|||
|
|
( 0xEA000000 | ( ( ( sizeof( struct spare_boot_head_t ) + sizeof(uboot_hash_value) + sizeof( int ) - 1 ) / sizeof( int ) - 2 ) & 0x00FFFFFF ) ),
|
|||
|
|
UBOOT_MAGIC,
|
|||
|
|
STAMP_VALUE,
|
|||
|
|
ALIGN_SIZE,
|
|||
|
|
0,
|
|||
|
|
0,
|
|||
|
|
UBOOT_VERSION,
|
|||
|
|
UBOOT_PLATFORM,
|
|||
|
|
{CONFIG_SYS_TEXT_BASE}
|
|||
|
|
},
|
|||
|
|
{
|
|||
|
|
{ 0 }, //dram para
|
|||
|
|
1008, //run core clock
|
|||
|
|
1200, //run core vol
|
|||
|
|
0, //uart port
|
|||
|
|
{ //uart gpio
|
|||
|
|
{0}, {0}
|
|||
|
|
},
|
|||
|
|
0, //twi port
|
|||
|
|
{ //twi gpio
|
|||
|
|
{0}, {0}
|
|||
|
|
},
|
|||
|
|
0, //work mode
|
|||
|
|
0, //storage mode
|
|||
|
|
{ {0} }, //nand gpio
|
|||
|
|
{ 0 }, //nand spare data
|
|||
|
|
{ {0} }, //sdcard gpio
|
|||
|
|
{ 0 }, //sdcard spare data
|
|||
|
|
0, //secure os
|
|||
|
|
0, //monitor
|
|||
|
|
{0}, // res
|
|||
|
|
UBOOT_START_SECTOR_IN_SDMMC, //OTA flag
|
|||
|
|
0, //dtb offset
|
|||
|
|
0, //boot_package_size
|
|||
|
|
0, //dram_scan_size
|
|||
|
|
{ 0 } //reserved data
|
|||
|
|
}
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
#pragma pack()
|
|||
|
|
/*******************************************************************************
|
|||
|
|
*
|
|||
|
|
* 关于Boot_file_head中的jump_instruction字段
|
|||
|
|
*
|
|||
|
|
* jump_instruction字段存放的是一条跳转指令：( B BACK_OF_Boot_file_head )，此跳
|
|||
|
|
*转指令被执行后，程序将跳转到Boot_file_head后面第一条指令。
|
|||
|
|
*
|
|||
|
|
* ARM指令中的B指令编码如下：
|
|||
|
|
* +--------+---------+------------------------------+
|
|||
|
|
* | 31--28 | 27--24 | 23--0 |
|
|||
|
|
* +--------+---------+------------------------------+
|
|||
|
|
* | cond | 1 0 1 0 | signed_immed_24 |
|
|||
|
|
* +--------+---------+------------------------------+
|
|||
|
|
* 《ARM Architecture Reference Manual》对于此指令有如下解释：
|
|||
|
|
* Syntax :
|
|||
|
|
* B{<cond>} <target_address>
|
|||
|
|
* <cond> Is the condition under which the instruction is executed. If the
|
|||
|
|
* <cond> is ommitted, the AL(always,its code is 0b1110 )is used.
|
|||
|
|
* <target_address>
|
|||
|
|
* Specified the address to branch to. The branch target address is
|
|||
|
|
* calculated by:
|
|||
|
|
* 1. Sign-extending the 24-bit signed(wro's complement)immediate
|
|||
|
|
* to 32 bits.
|
|||
|
|
* 2. Shifting the result left two bits.
|
|||
|
|
* 3. Adding to the contents of the PC, which contains the address
|
|||
|
|
* of the branch instruction plus 8.
|
|||
|
|
*
|
|||
|
|
* 由此可知，此指令编码的最高8位为：0b11101010，低24位根据Boot_file_head的大小动
|
|||
|
|
*态生成，所以指令的组装过程如下：
|
|||
|
|
* ( sizeof( boot_file_head_t ) + sizeof( int ) - 1 ) / sizeof( int ) 求出文件头
|
|||
|
|
* 占用的“字”的个数
|
|||
|
|
* - 2 减去PC预取的指令条数
|
|||
|
|
* & 0x00FFFFFF 求出signed-immed-24
|
|||
|
|
* | 0xEA000000 组装成B指令
|
|||
|
|
*
|
|||
|
|
*******************************************************************************/
|