tina sdk 下ubuntu分配根文件系统分区大于4G时，启动无法挂载成功

[duanzhh]

环境：
emmc：8G
平台：r818
系统：tina + ubuntu

现象描述：
当挂载的rootfs.img小于4G时，系统可以正常启动；当rootfs.img大于4G时，系统开机卡在挂载根文件系统系统阶段。

目前给的分区大小：

[partition]
    name         = rootfs
    size         = 10485760   # 5G大小
    downloadfile = "rootfs.fex"
    user_type    = 0x8000

打包rootfs.img为4.9G大小：

creating img file, wait...
记录了5000+0 的读入
记录了5000+0 的写出
5242880000 bytes (5.2 GB, 4.9 GiB) copied, 13.2979 s, 394 MB/s
[sudo] dzh 的密码： 
mke2fs 1.44.1 (24-Mar-2018)
丢弃设备块： 完成                            
创建含有 1280000 个块（每块 4k）和 320000 个inode的文件系统
文件系统UUID：1f080f91-343c-414a-bea9-d1d0933daab1
超级块的备份存储于下列块： 
	32768, 98304, 163840, 229376, 294912, 819200, 884736

正在分配组表： 完成                            
正在写入inode表： 完成                            
创建日志（16384 个块） 完成
写入超级块和文件系统账户统计信息： 已完成

img file ----- ok!
copy file to img,wait...
mnt:
bin  boot  dev	etc  home  lib	lost+found  media  mnt	opt  proc  root  run  sbin  srv  sys  tmp  usr	var
copy file ----- ok!
-rw-rw-r-- 1 dzh dzh 4.9G Sep 30 16:32 rootfs.img
=============== filesystem: rootfs.img created ==============

打包烧录到平台上时，报错如下：

[    4.636292] ALSA device list:
[    4.639640]   #0: audiocodec
[    4.644789] EXT4-fs (mmcblk0p5): couldn't mount as ext3 due to feature incompatibilities
[    4.657225] JBD2: no valid journal superblock found
[    4.662736] EXT4-fs (mmcblk0p5): error loading journal
[    4.669618] EXT2-fs (mmcblk0p5): error: couldn't mount because of unsupported optional features (2c0)
[    4.682958] EXT4-fs (mmcblk0p5): couldn't mount as ext3 due to feature incompatibilities
[    4.692129] plugin --> switch:1
[    4.699038] JBD2: no valid journal superblock found
[    4.704546] EXT4-fs (mmcblk0p5): error loading journal
[    4.711452] EXT2-fs (mmcblk0p5): error: couldn't mount because of unsupported optional features (2c0)
[    4.724335] List of all partitions:
[    4.728285] b300         7634944 mmcblk0  driver: mmcblk
[    4.734302]   b301             256 mmcblk0p1 a0085546-4166-744a-a353-fca9272b8e45
[    4.742949]   b302             512 mmcblk0p2 a0085546-4166-744a-a353-fca9272b8e46
[    4.751387]   b303             512 mmcblk0p3 a0085546-4166-744a-a353-fca9272b8e47
[    4.759827]   b304           15360 mmcblk0p4 a0085546-4166-744a-a353-fca9272b8e48
[    4.768261]   b305         5242880 mmcblk0p5 a0085546-4166-744a-a353-fca9272b8e49
[    4.776695]   b306           25600 mmcblk0p6 a0085546-4166-744a-a353-fca9272b8e4a
[    4.785129]   b307             256 mmcblk0p7 a0085546-4166-744a-a353-fca9272b8e4b
[    4.793563]   103:00000    2328559 mmcblk0p8 a0085546-4166-744a-a353-fca9272b8e4c
[    4.802006] b318             512 mmcblk0rpmb  (driver?)
[    4.807901] b310            4096 mmcblk0boot1  (driver?)
[    4.813902] b308            4096 mmcblk0boot0  (driver?)
[    4.819890] No filesystem could mount root, tried:  ext3 ext4 ext2 squashfs vfat msdos ntfs
[    4.829361] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,5)
[    4.838857] CPU: 3 PID: 1 Comm: swapper/0 Not tainted 4.9.191 #405
[    4.845805] Hardware name: sun50iw10 (DT)
[    4.850312] Call trace:
[    4.853070] [<ffffff8008087938>] dump_backtrace+0x0/0x204
[    4.859142] [<ffffff8008087b50>] show_stack+0x14/0x1c
[    4.864826] [<ffffff80082904ec>] dump_stack+0x88/0xb0
[    4.870511] [<ffffff800811131c>] panic+0x120/0x310
[    4.875901] [<ffffff8008911228>] mount_block_root+0x21c/0x2e4
[    4.882362] [<ffffff8008911360>] mount_root+0x70/0x80
[    4.888043] [<ffffff80089114e0>] prepare_namespace+0x170/0x180
[    4.894603] [<ffffff8008910e34>] kernel_init_freeable+0x150/0x18c
[    4.901459] [<ffffff80086ef06c>] kernel_init+0x10/0xf8
[    4.907238] [<ffffff8008083180>] ret_from_fork+0x10/0x50
[    4.913209] SMP: stopping secondary CPUs
[    4.917624] Kernel Offset: disabled
[    4.921555] Memory Limit: none
[    4.925005] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,5)

请问有人遇到过这种吗，大佬们有没有解决思路提供啊

[YuzukiTsuru]

@duanzhh 一般来说大镜像是使用overlayfs的方法而不是固定容量

另外：

[    4.644789] EXT4-fs (mmcblk0p5): couldn't mount as ext3 due to feature incompatibilities
[    4.657225] JBD2: no valid journal superblock found
[    4.662736] EXT4-fs (mmcblk0p5): error loading journal
[    4.669618] EXT2-fs (mmcblk0p5): error: couldn't mount because of unsupported optional features (2c0)
[    4.682958] EXT4-fs (mmcblk0p5): couldn't mount as ext3 due to feature incompatibilities
[    4.692129] plugin --> switch:1
[    4.699038] JBD2: no valid journal superblock found
[    4.704546] EXT4-fs (mmcblk0p5): error loading journal
[    4.711452] EXT2-fs (mmcblk0p5): error: couldn't mount because of unsupported optional features (2c0)

检查下是不是rootfs.img镜像也有问题

[duanzhh]

@yuzukitsuru 感谢大佬 ，昨天按照你的指示检查了一下，rootfs.img确实有问题，需要额外加一句调整分区的指令才可以；后面得空再研究如何使用overlayfs，特别感谢

[DAIZEBIN]

@duanzhh 在 tina sdk 下ubuntu分配根文件系统分区大于4G时，启动无法挂载成功 中说：

调整分区的指令
这个额外的“调整分区的指令”指的是？

[duanzhh]

@daizebin 我使用的时resize2fs这个指令调整文件系统分区大小的

[DAIZEBIN]

@duanzhh

[yang_wang]

大佬，你是把Tina的OpenWRT替换成了Ubuntu操作系统吗？

[jerrytech]

请问大佬这个怎么替换？是直接在pack的时候把rootfs.img换掉还是在之前就事先换掉？