我在s3c44b0上跑linux2.6.11.8，用了samsung网站的补丁：
http://opensrc.sec.samsung.com/download/linux-2.6.11.8-hsc0.patch.gz。
我的command line ："root=/dev/ram0 initrd=0xc500000,0x200000 init=/linuxrc rw console=ttyS0,115200 "
serial console输出如下信息后就没反应了：
RAMDISK driver initialized: 1 RAM disks of 2048K size 1024 blocksize
mice: PS/2 mouse device common for all mice
md: md driver 0.90.1 MAX_MD_DEVS=256, MD_SB_DISKS=27
NET: Registered protocol family 2
IP: routing cache hash table of 128 buckets, 4Kbytes
TCP established hash table entries: 512 (order: 0, 4096 bytes)
TCP bind hash table entries: 512 (order: 1, 14336 bytes)
TCP: Hash tables configured (established 512 bind 512)
Initializing IPsec netlink socket
NET: Registered protocol family 1
NET: Registered protocol family 17
md: Autodetecting RAID arrays.
md: autorun ...
md: ... autorun DONE.
RAMDISK: Compressed image found at block 0
文件系统结构如下：
[root@localhost rootfs]# pwd
/myfold/rootfs
[root@localhost rootfs]# tree
.
|-- bin
| |-- ash -> busybox
| |-- busybox
| |-- cat -> busybox
| |-- cp -> busybox
| |-- echo -> busybox
| |-- ip -> busybox
| |-- ls -> busybox
| |-- mkdir -> busybox
| |-- mount -> busybox
| |-- mv -> busybox
| |-- ping -> busybox
| |-- pwd -> busybox
| |-- rm -> busybox
| |-- touch -> busybox
| |-- umount -> busybox
| `-- vi -> busybox
|-- dev
| |-- console
| |-- initrd
| |-- null
| `-- ttyS0
|-- etc
|-- lib
|-- linuxrc
|-- mnt
| `-- etc
| |-- fstab
| |-- fstab~
| |-- group
| |-- group~
| |-- passwd
| `-- passwd~
|-- proc
|-- root
|-- sbin
| |-- halt -> ../bin/busybox
| |-- ifconfig -> ../bin/busybox
| |-- init -> ../bin/busybox
| |-- poweroff -> ../bin/busybox
| |-- reboot -> ../bin/busybox
| |-- start-stop-daemon -> ../bin/busybox
| `-- watchdog -> ../bin/busybox
|-- sys
|-- tmp
`-- usr
|-- bin
| |-- -> ../../bin/busybox
| |-- [[ -> ../../bin/busybox
| |-- mesg -> ../../bin/busybox
| |-- test -> ../../bin/busybox
| `-- tr -> ../../bin/busybox
|-- lib
`-- sbin
linuxrc内容如下：
#!/bin/ash
echo "mount /etc as ramfs"
/bin/mount -n -t ramfs ramfs /etc
/bin/cp -a /mnt/etc/* /etc
echo "re-create the /etc/mtab entries"
#re-create the /etc/mtab entries
#mount some file system
echo "-----------mount /dev/shm as tmpfs"
/bin/mount -n -t tmpfs tmpfs /dev/shm
echo "-----------mount /sys as sysfs"
/bin/mount -n -t sysfs none /sys
exec /sbin/init
ramdisk文件系统制作方法如下：
dd if=/dev/zero of=/dev/ram0 bs=1k count=2048
mke2fs -vm0 /dev/ram0 2048
mount /dev/ram0 /mnt/ramdisk
cp -rd /myfold/rootfs/* /mnt/ramdisk
umount /dev/ram0
dd if=/dev/ram0 bs=1k count=2048 | gzip -v9 > /tftpboot/ram_image.gz
用uboot下载zImage和am_image.gz，运行到上面说到的地方
RAMDISK: Compressed image found at block 0
然后就没反应了，怎么回事呢？
我在 windows下用仿真器调试了一下（只能看到汇编语言，看不到C源码）
发现console输出 RAMDISK: Compressed image found at block 0 以后，程序并没有跑飞，对照map文件，发现CPU是在void cpu_idle(void)这个函数里面转。
但是console上没任何反应了，不知何故。
我猜是不是需要在文件系统中对串口做一些工作？ |
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