Create Bootable SDCARD/USB

Partitioning and formatting

First identify the device node of the card:

sudo fdisk -l

This will list all the storage devices connected to your PC. Assuming the SD card is connected via USB and is sdb:

export card=/dev/sdb
export p=""

First use the "umount" command (notice the different spelling without the 'n') to unmount all the partitions, and then use the "fdisk" command to partition the SD card:

sudo fdisk ${card}

Use the command o to delete all partitions, and then use command n to add new partitions.

Command (m for help): n                                 # Type n
Partition type:
  p   primary (0 primary, 0 extended, 4 free)
  e   extended
Select (default p):                                     # Press Enter Key       
Using default response p
Partition number (1-4, default 1):                      # Press Enter Key
Using default value 1
First sector (2048-15523839, default 2048):             # Press Enter Key
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-15523839, default 15523839): +20M      # Type +20M

Add the second partition

Command (m for help): n
Partition type:                                           # Press Enter Key
  p   primary (1 primary, 0 extended, 3 free)
  e   extended
Select (default p): 
Using default response p
Partition number (1-4, default 2):                        # Press Enter Key
Using default value 2
First sector (43008-15523839, default 43008): 
Using default value 43008
Last sector, +sectors or +size{K,M,G} (43008-15523839, default 15523839): # Press Enter Key 
Using default value 15523839

Write the partition table into the SD card:

Command (m for help): w                                   # Type w

Format the partition:

sudo mkfs.vfat ${card}${p}1
sudo mkfs.ext4 ${card}${p}2

Bootloader

To be on the safe side, erase the first part of your SD card:

sudo dd if=/dev/zero of=${card} bs=1k count=1023 seek=1

Burn the bootloader into the SD card:

sudo dd if=${u-boot-dir}/u-boot-sunxi-with-spl.bin of=${card} bs=1024 seek=8

where ${u-boot-dir} represents the directory in which the u-boot-sunxi-with-spl.bin is.

[http://wiki.lemaker.org/BananaPro/Pi:Setting_up_the_bootable_SD_card

http://wiki.lemaker.org/BananaPro/Pi:Setting_up_the_bootable_SD_card
Source ]