How to extract kernel, rootfs, and dtb images from Linux ITB image

1 项奖励

To extract kernel, rootfs, and dtb images from the Linux ITB (LITB) image:

Browse to the folder containing LITB. For example:
```
$ cd flexbuild_lsdk2004/build/images/
```

To list the header information of LITB, use the following command: $ dumpimage -l <name of the image>

$ dumpimage -l  lsdk2004_ubuntu_main_LS_arm64.itb
FIT description: arm64 kernel, ramdisk and FDT blob
Created:         Tue Feb  2 18:54:19 2021
 Image 0 (kernel)
  Description:  ARM64 Kernel
  Created:      Tue Feb  2 18:54:19 2021
  Type:         Kernel Image
  Compression:  gzip compressed
  Data Size:    14086432 Bytes = 13756.28 kB = 13.43 MB
  Architecture: AArch64
  OS:           Linux
  Load Address: 0x84080000
  Entry Point:  0x84080000
  Hash algo:    crc32
  Hash value:   1980d6fd
 Image 1 (initrd)
  Description:  initrd for arm64
  Created:      Tue Feb  2 18:54:19 2021
  Type:         RAMDisk Image
  Compression:  uncompressed
  Data Size:    668988861 Bytes = 653309.43 kB = 638.00 MB
  Architecture: AArch64
  OS:           Linux
  Load Address: 0x00000000
  Entry Point:  0x00000000
  Hash algo:    crc32
  Hash value:   24aa3c08
 Image 2 (ls1012ardb-dtb)
  Description:  ls1012ardb-dtb
  Created:      Tue Feb  2 18:54:19 2021
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    14335 Bytes = 14.00 kB = 0.01 MB
  Architecture: AArch64
  Hash algo:    crc32
  Hash value:   383a8118
 Image 3 (ls1012aqds-dtb)
  Description:  ls1012aqds-dtb
  Created:      Tue Feb  2 18:54:19 2021
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    15972 Bytes = 15.60 kB = 0.02 MB
  Architecture: AArch64
  Hash algo:    crc32
  Hash value:   7d133305
 Image 4 (ls1012afrwy-dtb)
  Description:  ls1012afrwy-dtb
  Created:      Tue Feb  2 18:54:19 2021
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    15316 Bytes = 14.96 kB = 0.01 MB
  Architecture: AArch64
  Hash algo:    crc32
  Hash value:   7c456ca3
 Image 5 (ls1028ardb-dtb)
  Description:  ls1028ardb-dtb
  Created:      Tue Feb  2 18:54:19 2021
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    19767 Bytes = 19.30 kB = 0.02 MB
  Architecture: AArch64
  Hash algo:    crc32
  Hash value:   db86fa4f
 Image 6 (ls1028aqds-dtb)
  Description:  ls1028aqds-dtb
  Created:      Tue Feb  2 18:54:19 2021
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    24733 Bytes = 24.15 kB = 0.02 MB
  Architecture: AArch64
  Hash algo:    crc32
  Hash value:   e0b7a722
 Image 7 (ls1043ardb-dtb)
  Description:  ls1043ardb-dtb
  Created:      Tue Feb  2 18:54:19 2021
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    41085 Bytes = 40.12 kB = 0.04 MB
  Architecture: AArch64
  Hash algo:    crc32
  Hash value:   fcc6502c
 Image 8 (ls1043aqds-dtb)
  Description:  ls1043aqds-dtb
  Created:      Tue Feb  2 18:54:19 2021
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    34544 Bytes = 33.73 kB = 0.03 MB
  Architecture: AArch64
  Hash algo:    crc32
  Hash value:   45f82fba
 Image 9 (ls1046ardb-dtb)
  Description:  ls1046ardb-dtb
  Created:      Tue Feb  2 18:54:19 2021
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    40270 Bytes = 39.33 kB = 0.04 MB
  Architecture: AArch64
  Hash algo:    crc32
  Hash value:   013f5024
 Image 10 (ls1046aqds-dtb)
  Description:  ls1046aqds-dtb
  Created:      Tue Feb  2 18:54:19 2021
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    34317 Bytes = 33.51 kB = 0.03 MB
  Architecture: AArch64
  Hash algo:    crc32
  Hash value:   be066013
 Image 11 (ls1046afrwy-dtb)
  Description:  ls1046afrwy-dtb
  Created:      Tue Feb  2 18:54:19 2021
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    31528 Bytes = 30.79 kB = 0.03 MB
  Architecture: AArch64
  Hash algo:    crc32
  Hash value:   d872df6c
 Image 12 (ls1088ardb-dtb)
  Description:  ls1088ardb-dtb
  Created:      Tue Feb  2 18:54:19 2021
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    19523 Bytes = 19.07 kB = 0.02 MB
  Architecture: AArch64
  Hash algo:    crc32
  Hash value:   403066bc
 Image 13 (ls1088aqds-dtb)
  Description:  ls1088aqds-dtb
  Created:      Tue Feb  2 18:54:19 2021
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    19415 Bytes = 18.96 kB = 0.02 MB
  Architecture: AArch64
  Hash algo:    crc32
  Hash value:   a2bf2786
 Image 14 (ls2088ardb-dtb)
  Description:  ls2088ardb-dtb
  Created:      Tue Feb  2 18:54:19 2021
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    29838 Bytes = 29.14 kB = 0.03 MB
  Architecture: AArch64
  Hash algo:    crc32
  Hash value:   0069fe03
 Image 15 (ls2088aqds-dtb)
  Description:  ls2088aqds-dtb
  Created:      Tue Feb  2 18:54:19 2021
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    23557 Bytes = 23.00 kB = 0.02 MB
  Architecture: AArch64
  Hash algo:    crc32
  Hash value:   e8e9dfa7
 Image 16 (lx2160ardb-dtb)
  Description:  lx2160ardb-dtb
  Created:      Tue Feb  2 18:54:19 2021
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    32643 Bytes = 31.88 kB = 0.03 MB
  Architecture: AArch64
  Hash algo:    crc32
  Hash value:   e5859b31
 Image 17 (lx2160aqds-dtb)
  Description:  lx2160aqds-dtb
  Created:      Tue Feb  2 18:54:19 2021
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    27740 Bytes = 27.09 kB = 0.03 MB
  Architecture: AArch64
  Hash algo:    crc32
  Hash value:   f644de1e

To extract a particular image from LITB, use the following command: $ dumpimage -i <name of the image> -T <type> [-p position] [-o outfile] data_file

For example:

To extract the kernel image:

$ dumpimage -T flat_dt -i                                                                                                    lsdk2004_ubuntu_main_LS_arm64.itb -p 0 kernel
Extracted:
 Image 0 (kernel)
  Description:  ARM64 Kernel
  Created:      Tue Feb  2 18:54:19 2021
  Type:         Kernel Image
  Compression:  gzip compressed
  Data Size:    14086432 Bytes = 13756.28 kB = 13.43 MB
  Architecture: AArch64
  OS:           Linux
  Load Address: 0x84080000
  Entry Point:  0x84080000
  Hash algo:    crc32
  Hash value:   1980d6fd

To extract the rootfs image:

$ dumpimage -T flat_dt -i                                                                                                              lsdk2004_ubuntu_main_LS_arm64.itb -p 1 rootfs
Extracted:
 Image 1 (initrd)
  Description:  initrd for arm64
  Created:      Tue Feb  2 18:54:19 2021
  Type:         RAMDisk Image
  Compression:  uncompressed
  Data Size:    668988861 Bytes = 653309.43 kB = 638.00 MB
  Architecture: AArch64
  OS:           Linux
  Load Address: 0x00000000
  Entry Point:  0x00000000
  Hash algo:    crc32
  Hash value:   24aa3c08

To extract ls1012ardb-dtb (at position 2) and ls1012aqds-dtb (at position 3):

$ dumpimage -T flat_dt -i                                                                                                              lsdk2004_ubuntu_main_LS_arm64.itb -p 2 dtb1
Extracted:
 Image 2 (ls1012ardb-dtb)
  Description:  ls1012ardb-dtb
  Created:      Tue Feb  2 18:54:19 2021
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    14335 Bytes = 14.00 kB = 0.01 MB
  Architecture: AArch64
  Hash algo:    crc32
  Hash value:   383a8118
$ dumpimage -T flat_dt -i lsdk2004_ubuntu_main_LS_arm64.itb -p 3 dtb2
Extracted:
 Image 3 (ls1012aqds-dtb)
  Description:  ls1012aqds-dtb
  Created:      Tue Feb  2 18:54:19 2021
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    15972 Bytes = 15.60 kB = 0.02 MB
  Architecture: AArch64
  Hash algo:    crc32
  Hash value:   7d133305