（已解决）STM32内存溢出错误：unable to allocate space for section...

GKoSon 提问时间：2018-8-20 17:18 /

本帖最后由与龙共舞于 2018-8-21 13:48 编辑

hi遇到问题，网上找了找，还是无果，拿出来问问。
工程师IAR的我现在加入可一个加密解密的.C.H进去，里面很多u8【64】这样的全局变量吧编译报错了：
unable to allocate space for sections/blocks with a total
estimated minimum size of 0x18427 bytes (max align 0x8) in
<[0x20000000-0x20017fff]> (total uncommitted space 0x18000).

现在该怎么分配呢？
参考：http://blog.csdn.net/Thinkcortex/article/details/51712524 好像懂一点但又写不好
4. 当定义了一个超大的全局数组时，IAR编译报错

unable to allocate space for sections/blocks with a total estimated minimum size of 0xfcac bytes (max align 0x8) in <[0x20000000-0x2000bfff]> (total uncommitted

内存范围超出了STM32的RAM ,但是MDK并没有报错

5.在MDK中可使用 __attribute__ ((at(0X20001000))) 指定变量位置，在IAR中使用@(0X2001000)

+++++++++++++++++++20180821解决之路+++++++++++++++

网上找到办法都很高级我能力不行看不懂

主要思想是修改.icf文件确定一个区域给你内存去用吧

我先用第一种方法：malloc 发现如下这写法在VS可以通过在IAR报错了：Error[Pe059]: function call is not allowed in a constant expression！

#include "stdafx.h"
#include <malloc.h>
int *arr= (int *)malloc(10 * sizeof(int));
int main()
{
arr[1] = { 3 };
printf("%d\n",*(arr+1));
while (1);
return 0;
}

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此方法放弃 IAR不支持全局变量用malloc只能写数组。。。
用第二种土方法，把我的两个全局变量写死：
//BoolType Temp[65]@"u_boot_cmd";
//BoolType SubKey[16][48]@"u_boot_cmd";
修改为：
static BoolType *Temp =(BoolType *)0x20002000 ;//{ ( BoolType ) 0};
static BoolType *SubKey=(BoolType *)0x20002050 ;

写到这里代码也要改了恨的牙痒痒的搞个什么二维数组费劲儿
代码替换

// TablePermute ( SubKey, KeyBit, PC2_Table, 48 );  //PC-2置换-- OK
      TablePermute ( SubKey+(BoolType)(i)*48, KeyBit, PC2_Table, 48 );  //PC-2置换-- OK

算是二维数组的指针表示吧简单到爆炸

再次编译还是有问题标题的问题还在但是我注意到我的内存已经降下来之前我需要0X18427 现在是0X183E3了
加油
在找头文件的

/*------------- F函数备用A和备用B 异或得到48位输出 ---------------*/

// 异或后的结果48位分为8组,每组6位,作为8个S盒的输入          [组合操作]

// S盒以6位作为输入(8组),4位作为输出(4*(8组)=32位)

// S工作原理假设输入为A=abcdef ,则bcde所代表的数是0-15之间的

// 一个数记为 X=bcde ,af代表的是0-3之间的一个数,记为 Y=af

// 在S1的X列,Y行找到一个数Value,它在0-15之间,可以用二进制表示

// 所以为4bit (共32位)

static const unsigned char S_Box[8][4][16] =

{

//S1

14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,

0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,

4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,

15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13,

//S2

15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,

3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,

0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,

13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9,

//S3

10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,

13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,

13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,

1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12,

//S4

7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,

13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,

10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,

3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14,

//S5

2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,

14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,

4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,

11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3,

//S6

12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,

10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8, //S6表错误

9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,

4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13,

//S7

4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,

13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,

1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,

6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12,

//S8

13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,

1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,

7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,

2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11

};
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这个巨无霸的前面以前是static的  我再加了一个const  然后神奇的编译过了