可以做商品砍价的网站,网站建设的公司上海,武进网站建设咨询,昆明专业网站制作公司Yocto/OpenEmbedded使用的磁盘镜像格式是 wic。为嵌入式系统提供 bootable images。 The disk image format used in the Yocto Project is wic. .wic 文件显然只是一个带有分区表和分区的磁盘镜像#xff0c;就像下载 Linux 发行版时获得的所有 .img 文件一样。这就是为什么你…
Yocto/OpenEmbedded使用的磁盘镜像格式是 wic。为嵌入式系统提供 bootable images。 The disk image format used in the Yocto Project is wic. .wic 文件显然只是一个带有分区表和分区的磁盘镜像就像下载 Linux 发行版时获得的所有 .img 文件一样。这就是为什么你可以使用 dd 命令烧写 .wic 文件就像使用 .img 文件一样。 A .wic file is apparently just a disk image with a partition table and partitions, just like all the .img files you get when downloading e.g Linux distros. Thats why you can flash a .wic file using dd just like you would with a .img file. 之所以使用 .wic 文件扩展名是因为它是由 wic 工具创建的该工具读取 .wks 文件中描述的分区布局并生成带有相应分区的映像。有关 wic 工具的更多信息请参阅 19 Creating Partitioned Images Using Wic — The Yocto Project ® 5.0.1 documentation The reason for the .wic file extension is simply that its created by the wic tool, which reads a partition layout described in a .wks file and generates an image with the corresponding partitions. For more info on the wic tool, see: 19 Creating Partitioned Images Using Wic — The Yocto Project ® 5.0.1 documentation 如何读取wic文件中的内容呢 1Mount the .wic File
将wic文件加载为loop device。
Automatically find an available loop device and associate it with a file. $ sudo losetup -Pf --show my-image.wic
/dev/loop17 $ losetup --help
-a, --all list all used devices
-P, --partscan create a partitioned loop device
-f, --find find first unused device
--show print device name after setup (with -f)
-d, --detach loopdev... detach one or more devices
-D, --detach-all detach all used devices $ losetup -a 上面结果显示加载为/dev/loop17设备。 将设备名赋值给变量
LOOP_DEVICE$(sudo losetup -Pf --show my-image.wic) 2, List Partitions
使用fdisk命令查看加载设备的分区信息 $ sudo fdisk -l /dev/loop17
Disk /dev/loop17: 7.11 GiB, 7638816768 bytes, 14919564 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: 0x076c4a2a Device Boot Start End Sectors Size Id Type
/dev/loop17p1 * 16384 186775 170392 83.2M c W95 FAT32 (LBA)
/dev/loop17p2 196608 14919563 14722956 7G 83 Linux 3Mount Partitions sudo mount /dev/loop17p1 mnt 4Access Files cd mnt
ls 5, Cleaning up Unmount partitions:
sudo umount mnt 6, Detach the loop device sudo losetup -d /dev/loop17 使用kpartx命令操作 $ kpartx --help
-a add partition devmappings
-d del partition devmappings
-v verbose
-l list partitions devmappings that would be added by -a $ sudo kpartx -av my-image.wic
[sudo] password for dev:
add map loop17p1 (252:0): 0 170392 linear 7:17 16384
add map loop17p2 (252:1): 0 14722956 linear 7:17 196608 $ sudo kpartx -l my-image.wic
loop17p1 : 0 170392 /dev/loop17 16384
loop17p2 : 0 14722956 /dev/loop17 196608 $ sudo kpartx -l /dev/loop17
loop17p1 : 0 170392 /dev/loop17 16384
loop17p2 : 0 14722956 /dev/loop17 196608 $ sudo fdisk -l /dev/loop17
Disk /dev/loop17: 7.11 GiB, 7638816768 bytes, 14919564 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: 0x076c4a2a Device Boot Start End Sectors Size Id Type
/dev/loop17p1 * 16384 186775 170392 83.2M c W95 FAT32 (LBA)
/dev/loop17p2 196608 14919563 14722956 7G 83 Linux $ ls /dev/mapper/
control loop17p1 loop17p2 $ sudo mount /dev/mapper/loop17p2 mnt $ sudo umount mnt $ sudo kpartx -dv my-image.wic
del devmap : loop17p1
del devmap : loop17p2
loop deleted : /dev/loop17 $ sudo kpartx -dv /dev/loop17
del devmap : loop17p1
del devmap : loop17p2 参考
linux - Difference between wic and hddimg format in yocto - Stack Overflow
