2440移植Linux Kernel笔记(五)------制作yaffs2映像文件

你好！这里是风筝的博客，

欢迎和我一起交流。

 

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之前我们制作了jffs根文件，现在要来制作yaffs2根文件.

cd /work/nfs/
mkyaffs2image root rootfs.yaffs2

（

其中，root是busybox的安装路径，rootfs.yaffs2是目标文件.

这条命令需要到mkyaffs2image，记得先安装mkyaffs2image:

http://download.csdn.net/detail/guet_kite/9859634

先下载好yaffs_source_util_larger_small_page_nand.tar.bz2压缩包.
tar xjvf yaffs_source_util_larger_small_page_nand.tar.bz2
cd Development_util_ok/yaffs2/utils/
make
sudo cp mkyaffs2image /usr/bin/
sudo chmod 777 /usr/bin/mkyaffs2image
mkyaffs2image
出现：
mkyaffs2image: image building tool for YAFFS2 built May 11 2017
usage: mkyaffs2image dir image_file [convert]
           dir        the directory tree to be converted
           image_file the output file to hold the image
           'convert'  produce a big-endian image from a little-endian machine
即是安装成功.

）

 

之前我们已经给Kernel打了yaffs2补丁了，下载我们把uImage以及rootfs.yaffs2根文件下载进板子上.

发现：

yaffs: dev is 32505859 name is "mtdblock3" rw
yaffs: passed flags ""
VFS: Mounted root (yaffs2 filesystem) on device 31:3.
Freeing unused kernel memory: 176K (c06be000 - c06ea000)
Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = c0104000
[00000000] *pgd=00000000
Internal error: Oops: 5 [#1] ARM
Modules linked in:
CPU: 0 PID: 1 Comm: swapper Not tainted 4.4.66 #4
Hardware name: SMDK2440
task: c381faa0 ti: c3822000 task.ti: c3822000
PC is at kfree+0x48/0xbc
LR is at path_openat+0x338/0xeb4
pc : []    lr : []    psr: 60000093
sp : c3823dc8  ip : c3401088  fp : c3823e30
r10: c30a8980  r9 : c3401088  r8 : 00000021
r7 : 00000000  r6 : c3823eb0  r5 : a0000013  r4 : c3823e70
r3 : c3fe4460  r2 : c3fe4474  r1 : c30312c0  r0 : c3823eb0
Flags: nZCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: c000717f  Table: 30104000  DAC: 00000053
Process swapper (pid: 1, stack limit = 0xc3822190)
Stack: (0xc3823dc8 to 0xc3824000)
3dc0:                   c3823e70 c3fe4474 00020020 c3823e70 c3823f14 00020020
3de0: 00000000 c01ad490 c071c7e0 0000000a c3823eb0 c3401088 c06f94c0 00000041
3e00: 00000000 00000000 c3823e78 c30a8988 c3401220 c3409ce8 c06f94c0 c014305c
3e20: c073dd60 c3823e48 c39550f0 c3401220 00000000 00000000 c3409bc0 00000000
3e40: 00000000 0110dd24 c0708a88 c3823e70 c3823f14 00000001 c06ee870 c06ee900
3e60: 00000000 c381faa0 00000000 c01ae070 c39550f0 c3401088 fe37573a 00000007
3e80: c30312c7 c0141ae8 c39550f0 c3401e58 c3409ce8 00000101 00000000 0000001a
3ea0: 00000000 00000000 00000001 c3823eb0 c39550f0 c3401a18 c30312c0 00000000
3ec0: c3409e10 00000000 00000038 00000000 00000000 c072f782 00000000 c014262c
3ee0: c307c000 00000000 00000002 ffffff9c c072f782 c307c000 c307c000 c3ba8a00
3f00: c06ee870 c01a5bbc c06ee900 c31a2280 c31a2280 00020020 00000000 00000021
3f20: 00000100 00000001 c3ba8a00 c307c000 ffffff9c c3ba8a00 c06ee870 c01a764c
3f40: c06ec0f4 c0164774 c39550f0 c381fc90 0000002b 0000000b c06ec1b8 00000000
3f60: 00000000 c071be60 c061f324 00000000 00000000 00000000 00000000 00000000
3f80: 00000000 c01a7b88 00000000 c061f324 00000000 c01097cc c071be60 c05591d4
3fa0: 00000000 c055925c 00000000 c010a4b0 00000000 00000000 00000000 00000000
3fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
3fe0: 00000000 00000000 00000000 00000000 00000013 00000000 73de33cf 33ce33cc
[] (kfree) from [] (path_openat+0x338/0xeb4)
[] (path_openat) from [] (do_filp_open+0x64/0xb8)
[] (do_filp_open) from [] (do_open_execat+0x74/0x170)
[] (do_open_execat) from [] (do_execveat_common+0x178/0x640)
[] (do_execveat_common) from [] (do_execve+0x28/0x30)
[] (do_execve) from [] (try_to_run_init_process+0xc/0x3c)
[] (try_to_run_init_process) from [] (kernel_init+0x88/0xec)
[] (kernel_init) from [] (ret_from_fork+0x14/0x24)
Code: e3120001 e58d2004 12423001 e593701c (e5974000) 
---[ end trace 2b8bfb6afb01a088 ]---
Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b


---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b


random: nonblocking pool is initialized

 

好了，现在重点来了！！！注意笔记！！听课听课了后排的同学！！！

exitcode=0x0000000b

说明是内存错误，应该是指针指向了某个错误的地方.

我们看下log：[] (kfree) from [] (path_openat+0x338/0xeb4)

说明在kfree这个函数应该有问题.

在yaffs_vfs.c里看到如下内容：

void yaffs_put_link(struct inode *inode,void *alias)
{
kfree(alias);
}

因为之前我们修改了alias的保存位置，所以应该是这里出了问题，现在修改为：

#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 4, 66)/*这里我们用的是4.4.66版本，会执行else分支*/
void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias)
#else
void yaffs_put_link(struct inode *inode,void *alias)
#endif
{
kfree(alias);
}

修改了好保存，继续make uImage

然后下载到板子上，还是不能成功启动yaffs2文件：

Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
Control: c000717f  Table: 30104000  DAC: 00000017
Process swapper (pid: 1, stack limit = 0xc38261b8)
Stack: (0xc3827ec0 to 0xc3828000)
7ec0: c3405c80 c3401f58 c3827f0c c3ac08a0 c3826000 c02774c4 c3812430 c3401f58
7ee0: c06535ac 00000007 c06535ac 000040d0 c3857920 c3821d60 c3405c80 c02775f4
7f00: c3821d90 c3401f58 00000020 00000000 00000000 00000000 00000000 00000000
7f20: c3acbdc0 00000000 00000000 c3857920 c3ac08a0 c3405c80 c3ac08a0 c3af55d8
7f40: c3acbdc0 c0624418 c0624390 c019debc c0624390 c019cd90 00000002 c3826000
7f60: c3856000 c3ac08a0 c3af55d8 c019e26c 00000008 c3acbdf4 c3825bf8 00000000
7f80: 00000000 c0653d00 c04af57c 00000000 00000000 00000000 00000000 00000000
7fa0: 00000000 c04af5e0 00000000 c0109778 00000000 00000000 00000000 00000000
7fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
7fe0: 00000000 00000000 00000000 00000000 00000013 00000000 d3de73cf f3fe73cc
[] (yaffs_getxattr) from [] (get_vfs_caps_from_disk+0x5c/0x104)
[] (get_vfs_caps_from_disk) from [] (cap_bprm_set_creds+0x88/0x408)
[] (cap_bprm_set_creds) from [] (prepare_binprm+0x6c/0x120)
[] (prepare_binprm) from [] (do_execve+0x2fc/0x4a8)
[] (do_execve) from [] (kernel_init+0x64/0xec)
[] (kernel_init) from [] (ret_from_fork+0x14/0x3c)
Code: e1a06003 e3120002 e5915134 1a00000f (e5954008) 
---[ end trace c5cb40e8a330a2bc ]---
Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b

 

然后我们看到：

[] (yaffs_getxattr) from [] 

知道应该在yaffs_getxattr这里出错了，然后看下源码，

 

发现真的难改.........改不下去了..........................

我看了下4.4.66的Linux Kernel，是在2017年5月发布的，

yaffs2源码也是在2017年5月发布的，但是，

我猜是，yaffs2的支持技术是更不上Kernel的更新速度的，

与其我在这花大量的时间精力去移植，不如选个适合的Kernel版本.移植这些事情还是交给官方维护人员去做吧..........

去yaffs2的官网看了下，yaffs2文件大概五个月更新一次，那我就选一个五个月之前发布的Kernel吧.

看到Kernel4.8.17是2017年1月发布的，刚好，下载下来编译，给Kernel打yaffs2文件的补丁，编译直接成功，无需任何修改，很完美。

 

 

 

如果用Kernel4.4.66版本，可能要等到10月份左右发布的yaffs2源码了，到时可以试试.