72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
/*
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************************************************************************************************************************
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* Boot rom
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* Seucre Boot
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*
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* Copyright(C), 2006-2013, AllWinners Microelectronic Co., Ltd.
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* All Rights Reserved
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*
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* File Name : Base.h
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*
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* Author : glhuang
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*
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* Version : 0.0.1
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*
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* Date : 2013.09.05
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*
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* Description :
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*
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* Others : None at present.
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*
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*
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* History :
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*
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* <Author> <time> <version> <description>
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*
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* glhuang 2013.09.05 0.0.1 build the file
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*
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************************************************************************************************************************
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*/
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#include "common.h"
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#include "private_toc.h"
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extern sbrom_toc0_config_t *toc0_config;
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int verify_addsum( void *mem_base, __u32 size )
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{
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__u32 *buf;
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__u32 count;
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__u32 src_sum;
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__u32 sum;
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sbrom_toc1_head_info_t *bfh;
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bfh = (sbrom_toc1_head_info_t *)mem_base;
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/* 生成校验和 */
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src_sum = bfh->add_sum; // 从Boot_file_head中的“check_sum”字段取出校验和
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bfh->add_sum = STAMP_VALUE; // 将STAMP_VALUE写入Boot_file_head中的“check_sum”字段
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count = size >> 2; // 以 字（4bytes）为单位计数
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sum = 0;
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buf = (__u32 *)mem_base;
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do
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{
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sum += *buf++; // 依次累加，求得校验和
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sum += *buf++; // 依次累加，求得校验和
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sum += *buf++; // 依次累加，求得校验和
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sum += *buf++; // 依次累加，求得校验和
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}while( ( count -= 4 ) > (4-1) );
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while( count-- > 0 )
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sum += *buf++;
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bfh->add_sum = src_sum; // 恢复Boot_file_head中的“check_sum”字段的值
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if( sum == src_sum )
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return 0; // 校验成功
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else
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return -1; // 校验失败
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}
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