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1. Please prepare an SD card with a 512MB or larger capacity.

2. Connect the SD card to ATDE. For details, refer to「Using Removable Devices」.

3. Unmount the SD card if it is currently mounted.

   [PC ~]$mount
   (abbreviated)
   /dev/sdb1 on /media/atmark/B18A-3218 type vfat (rw,nosuid,nodev,relatime,uid=1000,gid=1000,fmask=0022,dmask=0077,codepage=437,iocharset=utf8,shortname=mixed,showexec,utf8,flush,errors=remount-ro,uhelper=udisks2)
   [PC ~]$sudo umount /dev/sdb1

4. Write the installation disk image to the SD card.

   [PC ~]$sudo dd if=install_disk_sd_[version]_[model].img of=/dev/sdb bs=4M
   94+1 records input
   94+1 records output
   397410304 bytes (397 MB) copied, 45.8441 seconds、 8.7 MB/sec
   [PC ~]$sync

1. Make sure the Armadillo is powered off. If the power is on, turn it off. Also, be sure to remove the battery if one is connected to 「CON13 RTC Backup Interface 1」.

2. Check the slide switch of the USB serial converter. Make sure that the slide switch is set to side "1" of 図3.8「Slide Switch Configuration」.

3. Use the installation disk to perform an SD boot. Insert the installation disk into the SD slot (CON4) and set JP1 to short.

4. When the Armadillo is powered on while holding User Switch 1 down, the bootloader will start up from the SD card and the following log will be displayed. When the log is displayed, release User Switch 1. For the location of User Switch 1, see 「Armadillo-IoT Gateway Exterior」.

   U-Boot SPL 2016.07-at16 (Jun 18 2018 - 12:04:02)
   Trying to boot from MMC1
   
   
   U-Boot 2016.07-at16 (Jun 18 2018 - 12:04:02 +0900)
   
   CPU:   Freescale i.MX7D rev1.3 at 996MHz
   CPU:   Extended Commercial temperature grade (-20C to 105C) at 31C
   Reset cause: POR
          Watchdog enabled
   I2C:   ready
   DRAM:  1 GiB
   Boot Source: SD
   Board Type: Armadillo-IoT G3 M1(0a000003)
   Revision: 0000
   S/N: 4
   DRAM: 00001e05
   XTAL: 00
   MMC:   FSL_SDHC: 0, FSL_SDHC: 1
   Loading Environment from MMC... *** Warning - bad CRC, using default environment
   
   Failed (-5)
   Loading Environment from MMC... *** Warning - bad CRC, using default environment
   
   Failed (-5)
   In:    serial
   Out:   serial
   Err:   serial
   Found PFUZE300! deviceid 0x30, revid 0x11
   Net:   FEC0
   =>

5. When the "boot" command is executed as follows, the installation starts and the eMMC are rewritten automatically.

   => boot
   switch to partitions #0, OK
   mmc0 is current device
   switch to partitions #0, OK
   mmc0 is current device
   reading boot.scr
   231 bytes read in 10 ms (22.5 KiB/s)
   Running bootscript from mmc ...
   ## Executing script at 82000000
   switch to partitions #0, OK
   mmc0 is current device
   reading uImage
   10157824 bytes read in 455 ms (21.3 MiB/s)
   Booting from mmc ...
   reading x1-minimal.dtb
   45687 bytes read in 18 ms (2.4 MiB/s)
   ## Booting kernel from Legacy Image at 82000000 ...
      Image Name:   Linux-3.14.79-at21
      Image Type:   ARM Linux Kernel Image (uncompressed)
      Data Size:    10157760 Bytes = 9.7 MiB
      Load Address: 80008000
      Entry Point:  80008000
      Verifying Checksum ... OK
   ## Flattened Device Tree blob at 84800000
      Booting using the fdt blob at 0x84800000
      Loading Kernel Image ... OK
      Using Device Tree in place at 84800000, end 8480e276
   
   Starting kernel ...
   : (省略)
   *+*+* Recovery Start!! *+*+*

   	Do not turn off the power supply while running the installation. Board data can be corrupted and unable to recover.

6. The following message usually shows up after finishing install process. Please power off the device.

   *+*+* Recovery Completed!! *+*+*
   

   After installation is complete, please set JP1 to open.

手順8.1 Rewriting the Root File System on eMMC

1. An SD boot must be performed in order to rewrite the root file system on eMMC. For details on how to create a boot disk and execute an SD boot, see 9章Utilizing SD Booting.

2. Prepare the Debian GNU/Linux root file system archive.

   [armadillo ~]#ls
   debian-stretch-armhf_aiotg-g3_[version].tar.gz

3. Recreate the root file system within the second partition of the eMMC.

   [armadillo ~]# mkfs.ext4 /dev/mmcblk2p2  
   mke2fs 1.42.12 (29-Aug-2014)
   /dev/mmcblk2p2 contains a ext4 file system
   last mounted on /root on Thu Jan  1 09:00:07 1970
   Proceed anyway? (y,n) y  
   ...[省略]...
   
   [armadillo ~]# mount -t ext4 /dev/mmcblk2p2 /mnt  
   [armadillo ~]# tar zxf debian-stretch-armhf_aiotg-g3_[version].tar.gz -C /mnt  
   [armadillo ~]# umount /mnt  

   	Recreate the file system on the second partition of eMMC.
   	Enter y and then ENTER.
   	Mount the second partition of the eMMC to the /mnt/ directory.
   	Extract the root file system archive to the /mnt/ directory.
   	Unmount the second partition of the eMMC mounted ot the　/mnt/ directory.