瑞芯微ROCK960 RK3399烧录image后扩容rootfs

问题描述：

RK3399开发板烧录官网提供的ubuntu镜像： Ubuntu 16.04 Server arm64（下载地址：https://www.96boards.org/documentation/consumer/rock/downloads/ubuntu.md.html）,

开发板上电运行查看系统根目录容量已使用96%：

root@rock960:~# df
Filesystem     1K-blocks    Used Available Use% Mounted on
/dev/root                % /
devtmpfs                      % /dev
tmpfs                         % /dev/shm
tmpfs                     % /run
tmpfs                               % /run/lock
tmpfs                         % /sys/fs/cgroup
tmpfs                           % /run/user/

root@rock960:~# 

再查看磁盘容量，32GB eMMC实际可用容量29GB，除去已分区容量还有27.5GB容量未分区：

root@rock960:~# fdisk -l /dev/mmcblk1
Disk /dev/mmcblk1: 29.1 GiB,  bytes,  sectors
Units: sectors of  *  =  bytes
Sector size (logical/physical):  bytes /  bytes
I/O size (minimum/optimal):  bytes /  bytes
Disklabel type: gpt
Disk identifier: F464C417-6F1F-4BF8-A1CE-BDB432A3BD1B

Device           Start      End  Sectors  Size Type
/dev/mmcblk1p1                  3.9M Linux filesystem
/dev/mmcblk1p2                4M Linux filesystem
/dev/mmcblk1p3                4M Linux filesystem
/dev/mmcblk1p4           112M EFI System
/dev/mmcblk1p5        .5G Linux filesystem
root@rock960:~# 

因此需要把未分区的27.5GB磁盘空间追加到/dev/mmcblk1p5并扩容rootfs文件系统。解决方法主要用到两个命令：parted和resize2fs。

首先重新分配/dev/mmcblk1p5分区大小到覆盖整个磁盘剩余容量：（注意fdisk不支持GPT分区）

root@rock960:~# parted /dev/mmcblk1
GNU Parted 3.2
Using /dev/mmcblk1
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print
Model: MMC BJNB4R (sd/mmc)
Disk /dev/mmcblk1: .3GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system  Name     Flags
       .8kB  4129kB  4096kB               loader1
       8389kB  .6MB  4194kB               loader2
       .6MB  .8MB  4194kB               trust
       .8MB  134MB   117MB   fat16        boot     boot, esp
       134MB   1746MB  1612MB  ext4         rootfs

(parted) unit s
(parted) print
Model: MMC BJNB4R (sd/mmc)
Disk /dev/mmcblk1: 61071360s
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start     End        Size       File system  Name     Flags
       64s       8063s      8000s                   loader1
       16384s    24575s     8192s                   loader2
       24576s    32767s     8192s                   trust
       32768s    262143s    229376s    fat16        boot     boot, esp
 5      262144s   3409886s   3147743s   ext4         rootfs

(parted) resizepart  %
(parted) print
Model: MMC BJNB4R (sd/mmc)
Disk /dev/mmcblk1: 61071360s
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start    End        Size       File system  Name     Flags
       64s      8063s      8000s                   loader1
       16384s   24575s     8192s                   loader2
       24576s   32767s     8192s                   trust
       32768s   262143s    229376s    fat16        boot     boot, esp
 5      262144s  61071326s  60809183s  ext4         rootfs

(parted) Q
root@rock960:~#

然后进行EXT文件系统扩容：

root@rock960:~# resize2fs /dev/mmcblk1p5
resize2fs 1.42. (-May-)
The filesystem is already  (4k) blocks long.  Nothing to do!
root@rock960:~# 

这时查看根目录下已使用容量已经变成5%

root@rock960:~# df -TH
Filesystem     Type      Size  Used Avail Use% Mounted on
/dev/root      ext4       31G  .4G   28G   % /
devtmpfs       devtmpfs  .0G       .0G   % /dev
tmpfs          tmpfs     .0G       .0G   % /dev/shm
tmpfs          tmpfs     .0G   51M  .0G   % /run
tmpfs          tmpfs     5.3M       5.3M   % /run/lock
tmpfs          tmpfs     .0G       .0G   % /sys/fs/cgroup
tmpfs          tmpfs     400M       400M   % /run/user/
root@rock960:~# 

后续：

TBD