SFUD 提示闪存超过32g

发布于 2020-12-03 14:29:20 浏览：2697 订阅该版

7 个回答

木又寸 2022-07-17

这家伙很懒，什么也没写！

zhd 2023-05-27

这家伙很懒，什么也没写！

sfud_sfdp.c文件中，read_basic_table函数负责解析读取到的JECED闪存基本参数表，打开sfud调试带打印可以看到从NM25Q128的参数表：

```c
[175] D/SFUD: (../rt-thread/components/drivers/spi/sfud/src/sfud_sfdp.c:203) JEDEC basic flash parameter table info:
[186] D/SFUD: (../rt-thread/components/drivers/spi/sfud/src/sfud_sfdp.c:204) MSB-LSB  3    2    1    0
[197] D/SFUD: (../rt-thread/components/drivers/spi/sfud/src/sfud_sfdp.c:206) [0001] 0xFF 0xF9 0x20 0xE5
[207] D/SFUD: (../rt-thread/components/drivers/spi/sfud/src/sfud_sfdp.c:206) [0002] 0xFF 0xFF 0xFF 0x07
[217] D/SFUD: (../rt-thread/components/drivers/spi/sfud/src/sfud_sfdp.c:206) [0003] 0x6B 0x08 0xEB 0x44
[228] D/SFUD: (../rt-thread/components/drivers/spi/sfud/src/sfud_sfdp.c:206) [0004] 0xBB 0x84 0x3B 0x08
[238] D/SFUD: (../rt-thread/components/drivers/spi/sfud/src/sfud_sfdp.c:206) [0005] 0xFF 0xFF 0xFF 0xFE
[248] D/SFUD: (../rt-thread/components/drivers/spi/sfud/src/sfud_sfdp.c:206) [0006] 0xFF 0x00 0xFF 0xFF
[258] D/SFUD: (../rt-thread/components/drivers/spi/sfud/src/sfud_sfdp.c:206) [0007] 0xEB 0x44 0xFF 0xFF
[269] D/SFUD: (../rt-thread/components/drivers/spi/sfud/src/sfud_sfdp.c:206) [0008] 0x52 0x0F 0x20 0x0C
[279] D/SFUD: (../rt-thread/components/drivers/spi/sfud/src/sfud_sfdp.c:206) [0009] 0xFF 0x00 0xD8 0x10

```

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20230527/445f57114cc45172e9fe521e04b04d92.png.webp)

表中第二行就是flash的容量大小，16M -> 0x07FFFFFF bit。而read_basic_table函数中解析该信息的代码是

```c
    /* get flash memory capacity */
    uint32_t table2_temp = ((long)table[7] << 24) | ((long)table[6] << 16) | ((long)table[5] << 8) | (long)table[4];

switch ((table[7] & (0x01 << 7)) >> 7) {

case 0:
        sfdp->capacity = 1 + (table2_temp >> 3);
        break;
    case 1:
        table2_temp &= 0x7FFFFFFF;
        if (table2_temp > sizeof(sfdp->capacity) * 8 + 3) {
            sfdp->capacity = 0;
            SFUD_INFO("Error: The flash capacity is grater than 32 Gb/ 4 GB! Not Supported.");
            return false;
        }
        sfdp->capacity = 1L << (table2_temp - 3);
        break;
    }
```

可以看到table2_temp拼接字节时，[4]作为最低字节，[7]作为最高字节，这和读出的表顺序相反，想要成功解析这张表，改一下这里就好了。

```c
    /* get flash memory capacity */
//    uint32_t table2_temp = ((long)table[7] << 24) | ((long)table[6] << 16) | ((long)table[5] << 8) | (long)table[4];
    //对NM25Q128高低字节要反过来解析，芯片bug？
    uint32_t table2_temp = ((long)table[4] << 24) | ((long)table[5] << 16) | ((long)table[6] << 8) | (long)table[7];
//    switch ((table[7] & (0x01 << 7)) >> 7) {
    switch ((table[4] & (0x01 << 7)) >> 7) {
    case 0:
        sfdp->capacity = 1 + (table2_temp >> 3);
        break;
    case 1:
        table2_temp &= 0x7FFFFFFF;
        if (table2_temp > sizeof(sfdp->capacity) * 8 + 3) {
            sfdp->capacity = 0;
            SFUD_INFO("Error: The flash capacity is grater than 32 Gb/ 4 GB! Not Supported.");
            return false;
        }
        sfdp->capacity = 1L << (table2_temp - 3);
        break;
    }
```

猜测是NM25Q128的问题？