创建TF卡镜像

如果您没有部署本地TFTP服务器，则您可以使用TF卡进行数据传输。
重要： 创建TF卡镜像将覆盖目标TF卡上的所有现有数据。

TF卡的默认大小为16 GB，建议您使用TF卡的GPT分区表。

按照以下步骤，创建TF卡镜像：

  1. 执行以下命令，生成sdcard.img文件。

    $ make -j$(nproc)
$ make buildroot_rootfs -j$(nproc)
$ make img

    结果：

    将生成输出文件work/sdcard.img。

    提示： 您可通过以下方式之一将镜像文件烧录到TF卡上：
    • 执行以下dd命令：
      $ sudo dd if=work/sdcard.img of=/dev/sdX bs=4096
$ sync
    • 或使用rpi-imager或balenaEtcher工具。
  2. （可选）如有需要，可使用以下方法扩展分区。
    • 方法1：在Ubuntu主机上：
      1. 输入以下命令，安装软件包：
        $ sudo apt install cloud-guest-utils e2fsprogs
      2. 在Ubuntu主机上插入一张TF卡。
      3. 执行以下命令扩展分区。
        注： /dev/sdX是TF卡设备名，可根据实际情况更改该变量。
        $ sudo growpart /dev/sdX 4 # extend partition 4
$ sudo e2fsck -f /dev/sdX4
$ sudo resize2fs /dev/sdX4 # extend filesystem
$ sudo fsck.ext4 /dev/sdX4
    • 方法2：在昉·星光 2开发板上运行fdisk和resize2fs命令：
      # fdisk /dev/mmcblk1
Welcome to fdisk (util-linux 2.37.2).
Changes will remain in memory only, until you decide to write 
 them.
Be careful before using the write command.
This disk is currently in use - repartitioning is probably a bad 
 idea.
It's recommended to umount all file systems, and swapoff all swap
partitions on this disk.
Command (m for help): d
Partition number (1-4, default 4): 4
Partition 4 has been deleted.
Command (m for help): n
Partition number (4-128, default 4): 4
First sector (614400-62333918, default 614400):
): t sector, +/-sectors or +/-size{K,M,G,T,P} (614400-62333918, 
 default 62333918)
Created a new partition 4 of type 'Linux filesystem' and of size 
 29.4 GiB.
Partition #4 contains a ext4 signature.
Do you want to remove the signature? [Y]es/[N]o: N
Command (m for help): w
The partition table has been altered.
Syncing disks.
# resize2fs /dev/mmcblk1p4
resize2fs 1.46.4 (18-Aug-2021)
Filesystem at /d[
111.756178] EXT4-fs (mmcblk1p4): resizing filesystem from 512000
to 30859756 blocks
ev/mmcblk1p4 is [
111.765203] EXT4-fs (mmcblk1p4): resizing filesystem from 512000
to 30859265 blocks
mounted on /; on-line resizing required
old_desc_blocks = 2, new_desc_blocks = 118
[ 112.141953] random: crng init done
[ 112.145369] random: 7 urandom warning(s) missed due to 
 ratelimiting
[ 115.474184] EXT4-fs (mmcblk1p4): resized filesystem to 30859265
The filesystem on /dev/mmcblk1p4 is now 30859756 (1k) blocks long.