2.u-boot-2013.01

pandaboard太有名了，u-boot-2013.01直接完全支持pandaboard开发板，只需要编译一下就能产生MLO, uboot.img文件，拷贝这两个到SD卡里，就可以在终端里看到信息。

1.下载u-boot-2013.01并解压
2.make omap4_panda_config
3.make 完成了，呵呵~

把MLO和uboot.img拷贝到SD卡里，并不是都能启动，原因就是SD卡的格式化问题，下面是我SD卡的格式化步骤，大家只需要把SD卡在/dev/下的设备结点换成自己的设备结点即可，前提是SD卡不能被挂载。因为除了这个是体验uboot，所以整个SD卡我分了一个区，除了分区的大小，其他步骤不能变，不然就不能正常启动。

yizheshangao@yizheshangao:/opt/omap4460/bootloaderPorject/u-boot-2013.01$ sudo fdisk /dev/mmcblk0

Command (m for help): p

Disk /dev/mmcblk0: 3957 MB, 3957325824 bytes
4 heads, 16 sectors/track, 120768 cylinders, total 7729152 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000c7669

        Device Boot      Start         End      Blocks   Id  System
/dev/mmcblk0p1            2048     7729151     3863552    c  W95 FAT32 (LBA)

Command (m for help): d
Selected partition 1

Command (m for help): n
Partition type:
   p   primary (0 primary, 0 extended, 4 free)
   e   extended
Select (default p): p
Partition number (1-4, default 1): 
Using default value 1
First sector (2048-7729151, default 2048): 
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-7729151, default 7729151): 
Using default value 7729151

Command (m for help): t
Selected partition 1
Hex code (type L to list codes): L

 0  Empty           24  NEC DOS         81  Minix / old Lin bf  Solaris        
 1  FAT12           27  Hidden NTFS Win 82  Linux swap / So c1  DRDOS/sec (FAT-
 2  XENIX root      39  Plan 9          83  Linux           c4  DRDOS/sec (FAT-
 3  XENIX usr       3c  PartitionMagic  84  OS/2 hidden C:  c6  DRDOS/sec (FAT-
 4  FAT16 <32M      40  Venix 80286     85  Linux extended  c7  Syrinx         
 5  Extended        41  PPC PReP Boot   86  NTFS volume set da  Non-FS data    
 6  FAT16           42  SFS             87  NTFS volume set db  CP/M / CTOS / .
 7  HPFS/NTFS/exFAT 4d  QNX4.x          88  Linux plaintext de  Dell Utility   
 8  AIX             4e  QNX4.x 2nd part 8e  Linux LVM       df  BootIt         
 9  AIX bootable    4f  QNX4.x 3rd part 93  Amoeba          e1  DOS access     
 a  OS/2 Boot Manag 50  OnTrack DM      94  Amoeba BBT      e3  DOS R/O        
 b  W95 FAT32       51  OnTrack DM6 Aux 9f  BSD/OS          e4  SpeedStor      
 c  W95 FAT32 (LBA) 52  CP/M            a0  IBM Thinkpad hi eb  BeOS fs        
 e  W95 FAT16 (LBA) 53  OnTrack DM6 Aux a5  FreeBSD         ee  GPT            
 f  W95 Ext'd (LBA) 54  OnTrackDM6      a6  OpenBSD         ef  EFI (FAT-12/16/
10  OPUS            55  EZ-Drive        a7  NeXTSTEP        f0  Linux/PA-RISC b
11  Hidden FAT12    56  Golden Bow      a8  Darwin UFS      f1  SpeedStor      
12  Compaq diagnost 5c  Priam Edisk     a9  NetBSD          f4  SpeedStor      
14  Hidden FAT16 <3 61  SpeedStor       ab  Darwin boot     f2  DOS secondary  
16  Hidden FAT16    63  GNU HURD or Sys af  HFS / HFS+      fb  VMware VMFS    
17  Hidden HPFS/NTF 64  Novell Netware  b7  BSDI fs         fc  VMware VMKCORE 
18  AST SmartSleep  65  Novell Netware  b8  BSDI swap       fd  Linux raid auto
1b  Hidden W95 FAT3 70  DiskSecure Mult bb  Boot Wizard hid fe  LANstep        
1c  Hidden W95 FAT3 75  PC/IX           be  Solaris boot    ff  BBT            
1e  Hidden W95 FAT1 80  Old Minix      
Hex code (type L to list codes): c
Changed system type of partition 1 to c (W95 FAT32 (LBA))

Command (m for help): a
Partition number (1-4): w
Partition number (1-4): 1

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: If you have created or modified any DOS 6.x
partitions, please see the fdisk manual page for additional
information.
Syncing disks.
yizheshangao@yizheshangao:/opt/omap4460/bootloaderPorject/u-boot-2013.01$ sudo mkfs.vfat -F 32 -n boot /dev/mmcblk0p1 
mkfs.vfat 3.0.12 (29 Oct 2011)
//重新插拔SD卡，或手动挂载到/media/boot/目录下
yizheshangao@yizheshangao:/opt/omap4460/bootloaderPorject/u-boot-2013.01$ cp MLO /media/boot/
yizheshangao@yizheshangao:/opt/omap4460/bootloaderPorject/u-boot-2013.01$ cp u-boot.img /media/boot/
yizheshangao@yizheshangao:/opt/omap4460/bootloaderPorject/u-boot-2013.01$ umount /media/boot 
yizheshangao@yizheshangao:/opt/omap4460/bootloaderPorject/u-boot-2013.01$ 

好了，把MLO和uboot.img拷贝到SD卡里，连接好开发板，上电。

根据打印信息，发现一个问题，pandaboard的网卡没有启动，这是什么原因，我还不知道，以后得研究一下