裸机移植yaffs2演示
Linux系统上
[fulinux@CentOS6 ~]$ cd yaffs2/
[fulinux@centos6 yaffs2]$ ls
bootstrap.c bootstrap.lds bsp common makefile start.S yaffs2
[fulinux@centos6 yaffs2]$ make
........................
........................
........................
[fulinux@centos6 yaffs2]$ ls
bootstrap.bin bootstrap.c bootstrap.lds bootstrap.map bsp common makefile start.S yaffs2
[fulinux@centos6 yaffs2]$
将bootstrap.bin文件拷贝到/tfpt目录下
s3c2440开发板上
[ s3c2440@guowenxue ]# set bstarp 'tftp 31000000 bootstrap.bin;go 31000000'
[ s3c2440@guowenxue ]# save
Saving Environment to NAND...
Erasing Nand...
Erasing at 0x60000 -- 100% complete.
Writing to Nand... done
[ s3c2440@guowenxue ]# run bstarp
dm9000 i/o: 0x20000300, id: 0x90000a46
DM9000: running in 16 bit mode
MAC: 08:00:3e:26:0a:6b
could not establish link
operating at 100M full duplex mode
Using dm9000 device
TFTP from server 192.168.1.2; our IP address is 192.168.1.111
Filename 'bootstrap.bin'.
Load address: 0x31000000
Loading: T ##############
done
Bytes transferred = 193924 (2f584 hex)
## Starting application at 0x31000000 ...
Bootstrap nandflash yaffs2 test Version 0.0.1
malloc memory space: 0x30f00000~0x31000000
Malloc address: 30f00008, string: Hello World!
Configures yaffs mount /nand: start block 16, end block 96
'/nand' mounted
Create directory [/nand/foo]
Create File [/nand/foo/f1] content: [foo/f1]
Create File [/nand/foo/f2] content: [foo/f2]
Create File [/nand/foo/f3] content: [foo/f3]
Create File [/nand/foo/f4] content: [foo/f4]
Create directory [/nand/bar]
Create File [/nand/bar/f1] content: [bar/f1]
List folder '/nand' with recursive:
drw- 1 /nand/bar 2048 bytes
-rw- 1 /nand/bar/f1 6 bytes
drw- 1 /nand/foo 2048 bytes
-rw- 1 /nand/foo/f4 6 bytes
-rw- 1 /nand/foo/f3 6 bytes
-rw- 1 /nand/foo/f2 6 bytes
-rw- 1 /nand/foo/f1 6 bytes
drw- 1 /nand/lost+found 2048 bytes
Remove /nand/foo/f4
Remove /nand/bar
List folder '/nand' with recursive:
drw- 1 /nand/foo 2048 bytes
-rw- 1 /nand/foo/f3 6 bytes
-rw- 1 /nand/foo/f2 6 bytes
-rw- 1 /nand/foo/f1 6 bytes
drw- 1 /nand/lost+found 2048 bytes
unmount and remount
List folder '/nand' with recursive:
drw- 1 /nand/lost+found 2048 bytes
代码分析
[fulinux@centos6 yaffs2]$ ls
bootstrap.bin bootstrap.c bootstrap.lds bootstrap.map bsp common makefile start.S yaffs2
[fulinux@centos6 yaffs2]$
先看看make后生成的bootstrap.map文件中主要的段：
Linker script and memory map startsize size
0x0000000000000000 . = ALIGN (0x4)
(.stack xxxxxxxxxxxxxxxxxx xxxx 运行时初始化这个段)
.text 0x0000000031000000 0x2c3dc
.rodata 0x000000003102c3dc 0x2c58
.data 0x000000003102f054 0x10
.bss 0x000000003102f588 0x36b4
其中代码段的第一个代码是start.S
start.S文件
/********************************************************************************************
* File: start.S - Startup Code for ARM920 CPU-core
* Version: 1.0.0
* Copyright: 2011 (c) Guo Wenxue <guowenxue@gmail.com>
* Description: When system power up, the CPU will comes here to excute the first code here.
* ChangeLog: 1, Release initial version on "Tue Jul 12 16:43:18 CST 2011"
*
*******************************************************************************************/