Armadillo 開発者サイト

手順9.1 Boot Disk Creation Example

1. Obtain the bootloader image file for SD boots.

   [PC ~]$ls
   u-boot-x1-[version].bin

2. Create two primary partitions on the SD card.

   [PC ~]$sudo fdisk /dev/sdb  
   
   Welcome to fdisk (util-linux 2.25.2).
   Changes will remain in memory only, until you decide to write them.
   Be careful before using the write command.
   
   
   Command (m for help): o  
   Created a new DOS disklabel with disk identifier 0x2b685734.
   
   Command (m for help): n  
   Partition type
      p   primary (0 primary, 0 extended, 4 free)
      e   extended (container for logical partitions)
   Select (default p):   
   
   Using default response p.
   Partition number (1-4, default 1):   
   First sector (2048-7761919, default 2048):   
   Last sector, +sectors or +size{K,M,G,T,P} (2048-7761919, default 7761919): +128M  
   
   Created a new partition 1 of type 'Linux' and of size 128 MiB.
   
   Command (m for help): n  
   Partition type
      p   primary (1 primary, 0 extended, 3 free)
      e   extended (container for logical partitions)
   Select (default p):   
   
   Using default response p.
   Partition number (2-4, default 2):   
   First sector (264192-7761919, default 264192):   
   Last sector, +sectors or +size{K,M,G,T,P} (264192-7761919, default 7761919):   
   
   Created a new partition 2 of type 'Linux' and of size 3.6 GiB.
   
   Command (m for help): t  
   Partition number (1,2, default 2): 1  
   Hex code (type L to list all codes): b  
   
   If you have created or modified any DOS 6.x partitions, please see the fdisk documentation for additional information.
   Changed type of partition 'Linux' to 'W95 FAT32'.
   
   Command (m for help): w  
   The partition table has been altered.
   Calling ioctl() to re-read partition table.
   Syncing disks.
   
   [PC ~]$

   	Start operations on the partition table of the SD card. If USB memory and so on is connected, the device file of the SD card may be for example sdc or sdd and different to that in this example.
   	Create a new empty DOS partition table.
   	Add a new partition.
   	Since the default value (p: primary) is specified for the partition type, just press enter.
   	Since the default value (1) is specified for the partition number, just press enter.
   	Since the default value (the beginning of usable sectors) is used for the start sector, just press enter.
   	Specify 128MByte worth for the last cylinder.
   	Add a new partition.
   	Since the default value (p: primary) is specified for the partition type, just press enter.
   	Since the default value (2) is specified for the partition number, just press enter.
   	Since the default value (the sector following the last sector of the first partition) is used for the start sector, just press enter.
   	Since the default value (end sector) is used for the final sector, just press enter.
   	Change the system type of the partition.
   	Specify the first partition.
   	Specify 0xb (Win95 FAT32) as the system type of the partition.
   	Write the changes to the SD card.

3. Please display the partition list and confirm that two partitions have been created.

   [PC ~]$sudo fdisk -l /dev/sdb
   
   Disk /dev/sdb: 3.7 GiB, 3974103040 bytes, 7761920 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
   Disklabel type: dos
   Disk identifier: 0x2b685734
   
   Device     Boot  Start     End Sectors  Size Id Type
   /dev/sdb1         2048  264191  262144  128M  b W95 FAT32
   /dev/sdb2       264192 7761919 7497728  3.6G 83 Linux

4. Create a file system on each partition.

   [PC ~]$sudo mkfs.vfat -F 32 /dev/sdb1  
   mkfs.fat 3.0.27 (2014-11-12)
   [PC ~]$sudo mkfs.ext4 /dev/sdb2  
   mke2fs 1.42.12 (29-Aug-2014)
   Creating filesystem with 937216 4k blocks and 234320 inodes
   Filesystem UUID: AAAAAAAA-BBBB-CCCC-DDDD-EEEEEEEEEEEE
   Superblock backups stored on blocks: 
   	32768, 98304, 163840, 229376, 294912, 819200, 884736
   
   Allocating group tables: done                            
   Writing inode tables: done                            
   Creating journal (16384 blocks): done
   Writing superblocks and filesystem accounting information: done 
   
   [PC ~]$

   	Create a FAT32 file system on the first partition.
   	Create an ext4 file system on the second partition.

5. Write the bootloader image file for SD boots to the SD card.

   [PC ~]$ls
   u-boot-x1-[version].bin
   [PC ~]$sudo dd if=u-boot-x1-[version].bin of=/dev/sdb bs=1k skip=1 seek=1
   [PC ~]$sync

手順9.3 Storing the Linux Kernel Image and DTB

1. Prepare the Linux kernel image and DTB.

   [PC ~]$ls
   uImage-x1-[version]  armadillo_iotg_g3_w2-[version].dtb

2. Store the Linux kernel image on the first partition of the boot disk.

   [PC ~]$mkdir sd  
   [PC ~]$sudo mount -t vfat /dev/sdb1 sd  
   [PC ~]$sudo cp uImage-x1-[version] sd/uImage  
   [PC ~]$sudo cp armadillo_iotg_w2-[version].dtb sd/armadillo_iotg_w2.dtb  
   [PC ~]$sudo umount sd  
   [PC ~]$rmdir sd  

   	Create the sd/ directory to mount the SD card.
   	Mount the first partition to the sd/ directory.
   	Copy the Linux kernel image to the sd/ directory.
   	Copy the DTB to the sd/ directory.
   	Unmount the first partition mounted to the sd/ directory.
   	Delete the sd/ directory.

   	Removing the SD card from the work PC before the unmounting is completed may damage the data on the SD card.