# Flash images
This section introduces the production steps of flash images of USB disk, SD card and master chip.

## USB disk image

- Uboot enables USB upgrade

  ```shell
  cd ${SDK_PATH}/ssd20x-uboot-open
  export ARCH="arm"
  export CROSS_COMPILE=arm-linux-gnueabihf-
  make menuconfig
  # Device Drivers --->
  #	[*]Support for Host-side USB
  #	[*]USB Mass Storage support
  #	MStar drivers --->
  #		[*]MSTAR Gpio
  #		[*]MSTAR USB
  #		[*]Enable 1st EHC
  #		[*]Enable 2nd EHC
  #		[*]Enable 3rd EHC
  ```
  
- Create an image of USB disk

  ```shell
  cd ${SDK_PATH}/ssd20x-images-open
  ./make_usb_upgrade_sigmaster.sh ./WT2012
  #1. Select the flash partition
  #2. Copy the generated SigmastarUpgrade.bin into USB disk
  #Note: USB disk needs to be in fat32 format
  ```
  <img src="..\_static\SSD2xx_img\img_image_B01.png" alt="img_image_B01" />


## SD card image

- Create an image of SD card

  ```shell
  cd ${SDK_PATH}/ssd20x-images-open
  ./make_sd_upgrade_sigmaster.sh ./WT2012
  #1. Select the flash partition
  #2. Copy the files in the sd_upgrade directory to the SD card
  ```
  <img src="..\_static\SSD2xx_img\img_image_B11.png" alt="img_image_B11" />

## Make a master

- Making a master depends on the images link file in the same directory. The steps to generate nand.bin are as follows:

  ```shell
  cd ${SDK_PATH}/ssd20x-images-open/SpinandPackBinTool
  ln -snf ../WT2012 images #Modify link file point
  vim SpinandPackBinTool/images/scripts/[[set_partition.es #Comment "setenv mtdparts ..." line number
  
  #Note: If you have modified the system partition, you need to modify the partition information of the dynpart line in auto_update_spinand.txt to keep it consistent with the mtdparts under uboot
  ```

-  Compile and generate a master

  ```shell
  ./SstarMakeBin_dual_env -n SPINAND_FS35ND02G.ini # The description information of nand in .ini file is different
  ```