自从移植了uboot，当然不是我写的移植代码， 呵呵，成功引导之后，对uboot爱不释手
参看了luofuchong大侠的贴
成功记录如下：
hujun2410=> printenv
bootdelay=8
baudrate=115200
ethaddr=00:00:C0:FF:EE:08
ipaddr=59.69.75.186
serverip=59.69.74.87
netmask=255.0.0.0
bootfile="zImage"
bootargs=console=ttySAC0 root=/dev/nfs nfsroot=59.69.74.87:/public/myroot_nfs ip=5fbootcmd=tftp 30008000 zImage;go 30008000
stdin=serial
stdout=serial
stderr=serial
Environment size: 366/65532 bytes
第一次：
hujun2410=> tftp 31000000 zImage.img
TFTP from server 59.69.74.87; our IP address is 59.69.75.186
Filename 'zImage.img'.
Load address: 0x31000000
Loading: #################################################################
#################################################################
#################################################################
#################################################################
done
Bytes transferred = 1326664 (143e48 hex)
hujun2410=> bootm 31000000
## Booting image at 31000000 ...
Image Name: UnCompressed Linux Kernel-2.6.14
Created: 2007-01-15 21:02:09 UTC
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 1326600 Bytes = 1.3 MB
Load Address: 30008000
Entry Point: 30008000
Verifying Checksum ... OK
hdr->ih_load=30008000,data=31000040
OK
boot linux
Starting kernel ...
Uncompressing Linux................................................................Linux version 2.6.14 (root@hujunlinux) (gcc version 3.4.1) #13 Sun Jan 14 15:42:577CPU: ARM920Tid(wb) [41129200] revision 0 (ARMv4T)
Machine: SMDK2410
Memory policy: ECC disabled, Data cache writeback
CPU S3C2410A (id 0x32410002)
S3C2410: core 202.800 MHz, memory 101.400 MHz, peripheral 50.700 MHz
S3C2410 Clocks, (c) 2004 Simtec Electronics
CLOCK: Slow mode (1.500 MHz), fast, MPLL on, UPLL on
CPU0: D VIVT write-back cache
CPU0: I cache: 16384 bytes, associativity 64, 32 byte lines, 8 sets
CPU0: D cache: 16384 bytes, associativity 64, 32 byte lines, 8 sets
Built 1 zonelists
Kernel command line: console=ttySAC0 root=/dev/nfs nfsroot=59.69.74.87:/public/myrfirq: clearing pending ext status 00000800
NET: Registered protocol family 1
IP-Config: Complete:
device=eth0, addr=59.69.74.199, mask=255.0.0.0, gw=59.69.74.1,
host=matrix4, domain=, nis-domain=arm9.net,
bootserver=59.69.74.87, rootserver=59.69.74.87, rootpath=
Looking up port of RPC 100003/2 on 59.69.74.87
Looking up port of RPC 100005/1 on 59.69.74.87
VFS: Mounted root (nfs filesystem).
Mounted devfs on /dev
Freeing init memory: 112K
Please press Enter to activate this console.
BusyBox v1.2.1 (2007.01.13-23:04+0000) Built-in shell (ash)
Enter 'help' for a list of built-in commands.
[root@hjembed /]#
hujun2410=> imi 31000000
## Checking Image at 31000000 ...
Image Name: UnCompressed Linux Kernel-2.6.14
Created: 2007-01-15 21:02:09 UTC
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 1326600 Bytes = 1.3 MB
Load Address: 30008000
Entry Point: 30008000
Verifying Checksum .. OK
第二次：
[root@hujunlinux tftpboot]# ./mkimage -n "uboot ramdisk filesystem" \
> -A arm -O linux -T ramdisk -C gzip -d today.ramfs.gz today.uboot.ramfs.gz
Image Name: uboot ramdisk filesystem
Created: Tue Jan 16 12:59:49 2007
Image Type: ARM Linux RAMDisk Image (gzip compressed)
Data Size: 2836874 Bytes = 2770.38 kB = 2.71 MB
Load Address: 0x00000000
Entry Point: 0x00000000
[root@hujunlinux tftpboot]# ./mkimage -l today.uboot.ramfs.gz
Image Name: uboot ramdisk filesystem
Created: Tue Jan 16 12:59:49 2007
Image Type: ARM Linux RAMDisk Image (gzip compressed)
Data Size: 2836874 Bytes = 2770.38 kB = 2.71 MB
Load Address: 0x00000000
Entry Point: 0x00000000
[root@hujunlinux tftpboot]#
hujun2410=> tftp 31000000 zImage.img
TFTP from server 59.69.74.87; our IP address is 59.69.75.186
Filename 'zImage.img'.
Load address: 0x31000000
Loading: #################################################################
#################################################################
#################################################################
#################################################################
done
Bytes transferred = 1326664 (143e48 hex)
hujun2410=> tftp 30800000 today.uboot.ramfs.gz
TFTP from server 59.69.74.87; our IP address is 59.69.75.186
Filename 'today.uboot.ramfs.gz'.
Load address: 0x30800000
Loading: #################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
###################################
done
Bytes transferred = 2836938 (2b49ca hex)
hujun2410=> bootm 31000000 30800000
## Booting image at 31000000 ...
Image Name: UnCompressed Linux Kernel-2.6.14
Created: 2007-01-15 21:02:09 UTC
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 1326600 Bytes = 1.3 MB
Load Address: 30008000
Entry Point: 30008000
Verifying Checksum ... OK
hdr->ih_load=30008000,data=31000040
OK
boot linux
## Loading Ramdisk Image at 30800000 ...
Image Name: uboot ramdisk filesystem
Created: 2007-01-16 17:59:49 UTC
Image Type: ARM Linux RAMDisk Image (gzip compressed)
Data Size: 2836874 Bytes = 2.7 MB
Load Address: 00000000
Entry Point: 00000000
Verifying Checksum ... OK
Starting kernel ...
Uncompressing Linux................................................................Linux version 2.6.14 (root@hujunlinux) (gcc version 3.4.1) #13 Sun Jan 14 15:42:577CPU: ARM920Tid(wb) [41129200] revision 0 (ARMv4T)
Machine: SMDK2410
Memory policy: ECC disabled, Data cache writeback
CPU S3C2410A (id 0x32410002)
S3C2410: core 202.800 MHz, memory 101.400 MHz, peripheral 50.700 MHz
S3C2410 Clocks, (c) 2004 Simtec Electronics
CLOCK: Slow mode (1.500 MHz), fast, MPLL on, UPLL on
CPU0: D VIVT write-back cache
CPU0: I cache: 16384 bytes, associativity 64, 32 byte lines, 8 sets
CPU0: D cache: 16384 bytes, associativity 64, 32 byte lines, 8 sets
Built 1 zonelists
Kernel command line: console=ttySAC0 root=/dev/nfs nfsroot=59.69.74.87:/public/myrfirq: clearing pending ext status 00000800
irq: clearing subpending status 00000002
PID hash table entries: 512 (order: 9, 8192 bytes)
timer tcon=00500000, tcnt a509, tcfg 00000200,00000000, usec 00001e4c
.....
IP-Config: Complete:
device=eth0, addr=59.69.74.199, mask=255.0.0.0, gw=59.69.74.1,
host=matrix4, domain=, nis-domain=arm9.net,
bootserver=59.69.74.87, rootserver=59.69.74.87, rootpath=
RAMDISK: Compressed image found at block 0
VFS: Mounted root (ext2 filesystem).
Mounted devfs on /dev
Please press Enter to activate this console.
第三次：
hujun2410=> tftp 31000000 zImage.img
TFTP from server 59.69.74.87; our IP address is 59.69.75.186
Filename 'zImage.img'.
Load address: 0x31000000
Loading: #################################################################
#################################################################
#################################################################
#################################################################
done
Bytes transferred = 1326664 (143e48 hex)
hujun2410=> tftp 33000000 today.uboot.ramfs.gz
TFTP from server 59.69.74.87; our IP address is 59.69.75.186
Filename 'today.uboot.ramfs.gz'.
Load address: 0x33000000
Loading: #################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
###################################
done
Bytes transferred = 2836938 (2b49ca hex)
hujun2410=> bootm 31000000 33000000
## Booting image at 31000000 ...
Image Name: UnCompressed Linux Kernel-2.6.14
Created: 2007-01-15 21:02:09 UTC
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 1326600 Bytes = 1.3 MB
Load Address: 30008000
Entry Point: 30008000
Verifying Checksum ... OK
hdr->ih_load=30008000,data=31000040
OK
boot linux
## Loading Ramdisk Image at 33000000 ...
Image Name: uboot ramdisk filesystem
Created: 2007-01-16 17:59:49 UTC
Image Type: ARM Linux RAMDisk Image (gzip compressed)
Data Size: 2836874 Bytes = 2.7 MB
Load Address: 00000000
Entry Point: 00000000
Verifying Checksum ... OK
Starting kernel ...
Uncompressing Linux................................................................Linux version 2.6.14 (root@hujunlinux) (gcc version 3.4.1) #13 Sun Jan 14 15:42:577CPU: ARM920Tid(wb) [41129200] revision 0 (ARMv4T)
Machine: SMDK2410
Memory policy: ECC disabled, Data cache writeback
CPU S3C2410A (id 0x32410002)
S3C2410: core 202.800 MHz, memory 101.400 MHz, peripheral 50.700 MHz
S3C2410 Clocks, (c) 2004 Simtec Electronics
CLOCK: Slow mode (1.500 MHz), fast, MPLL on, UPLL on
CPU0: D VIVT write-back cache
CPU0: I cache: 16384 bytes, associativity 64, 32 byte lines, 8 sets
CPU0: D cache: 16384 bytes, associativity 64, 32 byte lines, 8 sets
Built 1 zonelists
Kernel command line: console=ttySAC0 root=/dev/nfs nfsroot=59.69.74.87:/public/myrfirq: clearing pending ext status 00000800
RAMDISK driver initialized: 16 RAM disks of 8192K size 1024 blocksize
NET: Registered protocol family 1
IP-Config: Complete:
device=eth0, addr=59.69.74.199, mask=255.0.0.0, gw=59.69.74.1,
host=matrix4, domain=, nis-domain=arm9.net,
bootserver=59.69.74.87, rootserver=59.69.74.87, rootpath=
RAMDISK: Compressed image found at block 0
VFS: Mounted root (ext2 filesystem).
Mounted devfs on /dev
Please press Enter to activate this console.
总结：
1. bootm的作用是可以加载用uboot工具制作的kernel 和ramdisk ,这个工具就是uboot/tools/mkimage
利用他，可以 gz, bzip2, none等压缩方式压缩kernel 和ramdisk.，mkimage 在压缩时在起头部加入了0x40
字节的校验码。 所以在bootm源码中， 先从头部取出64个字节来校验， 如通过校验，再将其后面的内容
搬到内存a处，再从a处读取，启动内核。
这里要说一下，ramdisk，也可以说是我的一个发现， 刚开始用bootm成功启动是很偶然的，碰巧我
设置的参数是用nfs启动，后来试了几次，老是不行，加载ramdisk时，说Bad Magic Number
幸好我勤于记录， 才发现刚才成功了是因为用nfs启动的，猜想出现这个情况很可能与kernel类似，
因为之前我看uboot/readme有点印象。
果然 ，看了一下readme，才发现ramdisk也要用mkimage 才行。
如果你不用ramdisk作为根文件系统， 那就不用这个了。
2.kernel加载的地址是30008000, 是不能改的， 这个在include/configs/smdk2410.h中作了定义，
#define CFG_LOAD_ADDR 0x30008000 /* default load address */
你可以修改试试。
将ramdisk映像下载到内存的位置，可以不是0x30800000 ,可以自己指定。
3：uboot 可以自我更新 ，这是我以前所没有发现的，现在想来vivi中应该也可以的，是一个道理嘛
改天试试，先记录如下：
U-Boot 1.1.4 (Jan 16 2007 - 10:48:42)
U-Boot code: 33F80000 -> 33F9DAF4 BSS: -> 33FA2164
RAM Configuration:
Bank #0: 30000000 64 MB
Nor Flash: 0 kB
Nand Flash: 64 MB
In: serial
Out: serial
Err: serial
Hit any key to stop autoboot: 0
hujun2410=> tftp 30005000 u-boot.bin.debug
TFTP from server 59.69.74.87; our IP address is 59.69.75.186
Filename 'u-boot.bin.debug'.
Load address: 0x30005000
Loading: ########################
done
Bytes transferred = 121840 (1dbf0 hex)
hujun2410=> nand erase 0 20000
NAND erase: device 0 offset 0, size 131072 ... OK
hujun2410=> nand write 30005000 0 20000
NAND write: device 0 offset 0, size 131072 ... 131072 bytes written: OK
hujun2410=> reset
U-Boot 1.1.4 (Jan 16 2007 - 11:05:02)
U-Boot code: 33F80000 -> 33F9DBF0 BSS: -> 33FA2260
RAM Configuration:
Bank #0: 30000000 64 MB
-------------------todaygood debug ----------------
Nor Flash: 0 kB
Nand Flash: 64 MB
In: serial
Out: serial
Err: serial
Hit any key to stop autoboot: 0
hujun2410=>
这样一来，可比用并口烧写bootloader 快多了。
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