关于STM32模拟U盘升级固件的问题

CrazyMCU

最近因项目需求要给STM32F207升级固件，就是把STM32F207当成一个U盘，把生成的Bin文件拖进U盘里完成固件升级。

现在的情况是已经可以识别出U盘了，但每次上电都提示格式化，而且如果超过大概110KB就无法格式化，就不能使用了（我的APP代码有500多KB）
然后采用上电初始化自动填入MBR数据的方式解决了上电提示格式化问题，因为我只找到了256KB的MBR数据，所以U盘只能显示232KB（有部分用于Bootloder代码了），所以还是不够。
现在我就想到两种途径：
1、解决超过110KB无法格式化问题
2、找到FAT的MBR的格式说明，或有超过600KB的MBR表格
小弟也是在网上找了很久，不知有哪位大神能帮忙解决呢？万分感激。

CrazyMCU

附上MBR码：
const uint8_t FAT16_BootSector[FATBootSize]=    //232KB
{
0xEB,0x3C,0x90,0x4D,0x53,0x44,0x4F,0x53,0x35,0x2E,0x30,0x00,0x02,0x01,0x04,0x00,
0x02,0x00,0x02,0xF8,0x01,0xF8,0x02,0x00,0x01,0x00,0x01,0x00,0x00,0x00,0x00,0x00,
0x00,0xC8,0x00,0x00,0x80,0x00,0x29,0xBD,0xF8,0x5B,0x50,0x4E,0x4F,0x20,0x4E,0x41,
0x4D,0x45,0x20,0x20,0x20,0x20,0x46,0x41,0x54,0x31,0x32,0x20,0x20,0x20,0x33,0xC9,
0x8E,0xD1,0xBC,0xF0,0x7B,0x8E,0xD9,0xB8,0x00,0x20,0x8E,0xC0,0xFC,0xBD,0x00,0x7C,
0x38,0x4E,0x24,0x7D,0x24,0x8B,0xC1,0x99,0xE8,0x3C,0x01,0x72,0x1C,0x83,0xEB,0x3A,
0x66,0xA1,0x1C,0x7C,0x26,0x66,0x3B,0x07,0x26,0x8A,0x57,0xFC,0x75,0x06,0x80,0xCA,
0x02,0x88,0x56,0x02,0x80,0xC3,0x10,0x73,0xEB,0x33,0xC9,0x8A,0x46,0x10,0x98,0xF7,
0x66,0x16,0x03,0x46,0x1C,0x13,0x56,0x1E,0x03,0x46,0x0E,0x13,0xD1,0x8B,0x76,0x11,
0x60,0x89,0x46,0xFC,0x89,0x56,0xFE,0xB8,0x20,0x00,0xF7,0xE6,0x8B,0x5E,0x0B,0x03,
0xC3,0x48,0xF7,0xF3,0x01,0x46,0xFC,0x11,0x4E,0xFE,0x61,0xBF,0x00,0x00,0xE8,0xE6,
0x00,0x72,0x39,0x26,0x38,0x2D,0x74,0x17,0x60,0xB1,0x0B,0xBE,0xA1,0x7D,0xF3,0xA6,
0x61,0x74,0x32,0x4E,0x74,0x09,0x83,0xC7
};


const uint8_t FAT16_BootSector[FATBootSize]=  //14KB
{
0xEB,0x3C,0x90,0x4D,0x53,0x44,0x4F,0x53,0x35,0x2E,0x30,0x00,0x02,0x01,0x01,0x00,
0x01,0x10,0x00,0x20,0x00,0xF8,0x02,0x00,0x01,0x00,0x01,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x29,0x74,0x19,0x02,0x27,0x4C,0x50,0x43,0x32,0x31,
0x34,0x38,0x20,0x55,0x53,0x42,0x46,0x41,0x54,0x31,0x32,0x20,0x20,0x20,0x33,0xC9,
0x8E,0xD1,0xBC,0xF0,0x7B,0x8E,0xD9,0xB8,0x00,0x20,0x8E,0xC0,0xFC,0xBD,0x00,0x7C,
0x38,0x4E,0x24,0x7D,0x24,0x8B,0xC1,0x99,0xE8,0x3C,0x01,0x72,0x1C,0x83,0xEB,0x3A,
0x66,0xA1,0x1C,0x7C,0x26,0x66,0x3B,0x07,0x26,0x8A,0x57,0xFC,0x75,0x06,0x80,0xCA,
0x02,0x88,0x56,0x02,0x80,0xC3,0x10,0x73,0xEB,0x33,0xC9,0x8A,0x46,0x10,0x98,0xF7,
0x66,0x16,0x03,0x46,0x1C,0x13,0x56,0x1E,0x03,0x46,0x0E,0x13,0xD1,0x8B,0x76,0x11,
0x60,0x89,0x46,0xFC,0x89,0x56,0xFE,0xB8,0x20,0x00,0xF7,0xE6,0x8B,0x5E,0x0B,0x03,
0xC3,0x48,0xF7,0xF3,0x01,0x46,0xFC,0x11,0x4E,0xFE,0x61,0xBF,0x00,0x00,0xE8,0xE6,
0x00,0x72,0x39,0x26,0x38,0x2D,0x74,0x17,0x60,0xB1,0x0B,0xBE,0xA1,0x7D,0xF3,0xA6,
0x61,0x74,0x32,0x4E,0x74,0x09,0x83,0xC
};

正点原子

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