MINI6410 uboot中USB下载

我使用的Friendly ARM已经配置好的U-boot，然后利用他自带的USB下载功能往ARM板上烧制内核和文件系统，不需要输入地址参数，搞得挺简单，但是不清楚内核到底下载到什么位置了，能否和内核中设置的MTD分区匹配起来？

疑惑了好几天，网上百度了一些，还是没有找到下载菜单的位置，最终还是grep帮了大忙，直接拿下载菜单中的选项做关键词，在common文件中search，

      find . -name "*.c" | xargs grep -i  "uboot.bin" 

相关代码原来在main.c中：

while(1) {int c;printf("##### FriendlyARM U-Boot(" RELEASE_MARK ", " BOOT_MEDIA ") for 6410 #####\n");printf("[f] Format the nand flash\n");printf("[v] Download u-boot.bin\n");printf("[k] Download Linux/Android kernel\n");printf("[y] Download root yaffs2 image\n");printf("[u] Download root ubifs image\n");printf("[a] Download Absolute User Application\n");printf("[n] Download Nboot.nb0 for WinCE\n");printf("[w] Download WinCE NK.nb0\n");printf("[s] Set the boot parameter of Linux\n");printf("[b] Boot Linux\n");printf("[q] Quit to shell\n");printf("NAND(%s): %u MiB, RAM: %u MiB\n", NandIsMlc2() ? "MLC2" : (NandIsMlc1()? "MLC1" : "SLC"), FriendlyARMGetNandSizeInMB(), PHYS_SDRAM_1_SIZE >> 20);if (Lcd != 0) {printf("LCD type, firmware version: %u %u\n", Lcd, FirmwareVer);}printf("Enter your Selection:");c = getc();printf("%c\n", c >= ' ' && c <= 127 ? c : ' ');switch(c) {unsigned max_size, pos, len;case 'F': case 'f':FriendlyARMFormatFrom(0, 1);break;case 'V': case 'v':pos = 0;max_size = 256 K;len = 256 K;FriendlyARMGetDataFromUsbAndWriteNand(max_size, pos, len, "U-Boot.bin");SetLinuxCommandLine(NULL);break;case 'K': case 'k':if (NandIsMlc()) {pos =  4 M;max_size = 5 M - 128 K;len = 8 M;NAND_EraseBlock(1 M / NandBlockSizeInByte);} else {pos = 4 * 128 K;max_size = 5 M - 128 K;len = 5 M;}FriendlyARMGetDataFromUsbAndWriteNand(max_size, pos, len, "Linux/Android Kernel");break;case 'Y': case 'y':if (NandIsMlc()) {printf("Yaffs is not support yet for MLC2 NAND\n");} else {FriendlyARMGetDataFromUsbAndWriteNand(126 M, 5 M + 4 * 128 K, (unsigned)-1, "yaffs2-image");SetLinuxCommandLine("root=/dev/mtdblock2 console=ttySAC0,115200");}break;case 'U': case 'u':max_size = 126 M;len = (unsigned) -2;if (NandIsMlc()) {pos = 12 M;} else {pos = 5 M + 4 * 128 K;}FriendlyARMGetDataFromUsbAndWriteNand(max_size, pos, len, "ubifs-image");SetLinuxCommandLine("init=/linuxrc rootfstype=ubifs root=ubi0:FriendlyARM-root ubi.mtd=2 console=ttySAC0,115200");break;case 'A': case 'a':FriendlyARMGetDataFromUsbAndWriteNand(64 M, 0, 128 M, "User-Bin");break;case 'N': case 'n':FriendlyARMGetDataFromUsbAndWriteNand(128 K, 0, 128 K, "nboot.nb0");break;case 'W': case 'w':if (NandIsMlc()) {max_size = 63 M;pos =  8 M;len = 72 M;FriendlyARMFormatFrom( pos / NandBlockSizeInByte, 0);} else {max_size = 63 M;pos = 2 M + 4 * 128 K;len = 64 M;ExecuteCmd("nand erase 4280000");}FriendlyARMGetDataFromUsbAndWriteNand(max_size, pos, len, "NK.nb0");// Mark the indicators of NK Magic Number and Image Size{unsigned char *p = (unsigned char *)0xC0000000;memset(p, 0, 128 K);((unsigned *)p)[0] = 0xCEFA4146U;((unsigned *)p)[1] = 63 M;if (NandIsMlc()) {pos = 1 M;len = 2 M;} else {pos = 2 * NandBlockSizeInByte;len = 1 * NandBlockSizeInByte;}FriendlyARMWriteNand(p, 128 K, pos, len);}break;case 'S': case 's':{int r;r = readline("Linux cmd line: ");if (r > 0 && r < 1000) {SetLinuxCommandLine(console_buffer);} else {printf("Linux command line not changed\n");}}break;case 'B': case 'b': if (NandIsMlc()) {ExecuteCmd("nand read.i c0008000 400000 500000;bootm c0008000");} else {ExecuteCmd(CONFIG_BOOTCOMMAND);}while(1);case 'Q': case 'q':if (NandIsMlc()) {//printf("Caution: any nand write command may damage your data. DON'T use them\n");}return;default:;}}

我只想知道其中关于MTD的分区，看到源代码一看就明白了，就不去看他调用的其他函数；我用的yaffs2格式的根文件系统，在arch/arm/mach-s3c64xx/mach-mini6410文件中，关于MTD分区的定义：

static struct mtd_partition mini6410_nand_part[] = {{.name= "Bootloader",.offset= 0,.size= (4 * 128 *SZ_1K),.mask_flags= MTD_CAP_NANDFLASH,},{.name= "Kernel",.offset= (4 * 128 *SZ_1K),.size= (5*SZ_1M) ,.mask_flags= MTD_CAP_NANDFLASH,},{.name= "File System",.offset= MTDPART_OFS_APPEND,.size= MTDPART_SIZ_FULL,}};

MTD分区完全匹配，恍然大悟的感觉真好，哈哈