busybox官網地址：

本次移植採用的busybox版本：

busybox-1.26.0.tar.bz2

交叉編譯工具鏈版本：

$ arm-linux-gcc -v
gcc version 4.4.3 (ctng-1.6.1)

1、busybox目錄下make menuconfig

2、給核心打上yaffs2補丁

# git clone git://www.aleph1.co.uk/yaffs2           
# cd yaffs2/
# ./patch-ker.sh c /home/invoker/akernel4.0/linux-4.0.8（核心路徑）
# make menuconfig 將新增yaffs2至核心（核心的menuconfig）
 

3、在uboot下通過nand write.yaffs 命令燒錄rootfs之後載入，出現以下問題，主要是yaffs2檔案的錯誤，可參考以下連結修改即可：

Unable to handle kernel paging request at virtual address 70616774
pgd = c0004000
[70616774] *pgd=00000000
Internal error: Oops: 5 [#1] ARM
Modules linked in:
CPU: 0 PID: 1 Comm: swapper Not tainted 4.0.0 #3
Hardware name: MINI2440
task:
 
 c3834000 ti: c3836000 task.ti: c3836000
PC is at yaffs_getxattr+0x20/0x90
LR is at get_vfs_caps_from_disk+0x5c/0x104
http://blog.csdn.net/blazar/article/details/79247464

yaffs: dev is 32505859 name is "mtdblock3" rw
yaffs: passed flags ""
VFS: Mounted root (yaffs filesystem) on device 31:3.
Freeing unused kernel memory: 152
 
K (c0510000 - c0536000)
Unable to handle kernel paging request at virtual address 70616774
pgd = c0004000
[70616774] *pgd=00000000
Internal error: Oops: 5 [#1] ARM
Modules linked in:
CPU: 0 PID: 1 Comm: swapper Not tainted 4.0.0 #3
Hardware name: MINI2440
task: c3834000 ti: c3836000 task.ti: c3836000
PC is at yaffs_getxattr+0x20/0x90
LR is at get_vfs_caps_from_disk+0x5c/0x104
pc : [<c016e22c>]    lr : [<c0190134>]    psr: 60000013
sp : c3837ed0  ip : c016e20c  fp : c3b7e000
r10: c3927a30  r9 : 00000000  r8 : 00000014
r7 : 7061676c  r6 : c3837eec  r5 : c342d6f0  r4 : c0549818
r3 : 00000014  r2 : f0000010  r1 : c04a13a0  r0 : c342e220
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
Control: c000717f  Table: 30004000  DAC: 00000017
Process swapper (pid: 1, stack limit = 0xc3836190)
Stack: (0xc3837ed0 to 0xc3838000)
7ec0:                                     c3837f14 c342d6f0 c342e220 c3927a00
7ee0: c3809500 c0190134 c3809500 00000000 c3927a30 c3b7e000 000081ed c3837f10
7f00: c3912a00 c03dc8cc c3912a00 c0190314 00000000 00000000 00000000 00000000
7f20: 00000000 00000000 c0539fc0 c3912a00 c3b73000 c3912a00 c0539f30 c0539fc0
7f40: 00000000 00000002 c3b7e000 c00a34a0 c3b89000 c3b73000 c3b89000 c00a3e24
7f60: c048db78 c3b7e038 c38341e8 00000000 00000000 c0560c20 c03d771c 00000000
7f80: 00000000 00000000 00000000 00000000 00000000 c00a407c 00000000 c03d771c
7fa0: 00000000 c03d7780 00000000 c0009638 00000000 00000000 00000000 00000000
7fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
7fe0: 00000000 00000000 00000000 00000000 00000013 00000000 334c32ce 138a324c
[<c016e22c>] (yaffs_getxattr) from [<c0190134>] (get_vfs_caps_from_disk+0x5c/0x104)
[<c0190134>] (get_vfs_caps_from_disk) from [<c0190314>] (cap_bprm_set_creds+0x138/0x340)
[<c0190314>] (cap_bprm_set_creds) from [<c00a34a0>] (prepare_binprm+0x84/0x11c)
[<c00a34a0>] (prepare_binprm) from [<c00a3e24>] (do_execveat_common+0x434/0x618)
[<c00a3e24>] (do_execveat_common) from [<c00a407c>] (do_execve+0x28/0x30)
[<c00a407c>] (do_execve) from [<c03d7780>] (kernel_init+0x64/0xec)
[<c03d7780>] (kernel_init) from [<c0009638>] (ret_from_fork+0x14/0x3c)
Code: e1a08003 e3120002 e5917118 1a00000f (e5975008) 
---[ end trace 81fbd058ed34ea04 ]---
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

4、出現下述錯誤的原因是，uboot燒根檔案系統時，我沒有用nand write.yaffs命令。

Kernel panic - not syncing: Requested init /linuxrc failed (error -2).
CPU: 0 PID: 1 Comm: swapper Not tainted 4.0.0 #3
Hardware name: MINI2440
[<c000f63c>] (unwind_backtrace) from [<c000c864>] (show_stack+0x10/0x14)
[<c000c864>] (show_stack) from [<c03d7d58>] (panic+0x7c/0x1fc)
[<c03d7d58>] (panic) from [<c03d779c>] (kernel_init+0x80/0xec)
[<c03d779c>] (kernel_init) from [<c0009638>] (ret_from_fork+0x14/0x3c)
---[ end Kernel panic - not syncing: Requested init /linuxrc failed (error -2).
random: nonblocking pool is initialized

5、出錯：用makeyaffs2image-128M命令做出來的檔案系統很大，差不多有500MB

解決：拷貝lib庫到自制檔案系統的lib資料夾時，是cp cross-compile-tools/lib*.so* rootfs/lib/ -d，改成cp cross-compile-tools/lib*.so* rootfs/lib -d，原因目前不知。

6、出錯：busybox 編譯錯誤 miscutils/nandwrite.c:

7、busybox分析和製作記錄：

其它參考連結：