我已经按照《嵌入式LINUX应用开始完全手册》中的LINUX内核移植章节中的介绍的方法，用书中的提供的补丁对
内核打了补丁，也按照书中说的增加了对YAFFS文件系统的支持，编译下到MINI2440 启动后，还是出现了
。。。。。。。。
mapped channel 0 to 0
s3c2440-sdi s3c2440-sdi: powered down.
s3c2440-sdi s3c2440-sdi: initialisation done.
usbcore: registered new interface driver hiddev
usbcore: registered new interface driver usbhid
drivers/hid/usbhid/hid-core.c: v2.6:USB HID core driver
TCP cubic registered
NET: Registered protocol family 1
drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
Root-NFS: No NFS server available, giving up.
VFS: Unable to mount root fs via NFS, trying floppy.
VFS: Cannot open root device "hda1" or unknown-block(2,0)
Please append a correct "root=" boot option; here are the available partitions:
1f00       2048 mtdblock0 (driver?)
1f01       8192 mtdblock1 (driver?)
1f02      55296 mtdblock2 (driver?)
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)
的错误。
查了一些资料，有人说要在make menuconfig 的时候增加对 ramdisk   和 initrd 支持，
但是我不知道ramdisk   和 initrd 在内核配置选项的那个选项下。
有那位大哥碰到过类似的问题或是知道这么解决这个问题，望指教，谢谢！
（我是在虚拟机中安装的LINUX下编译的）

我以前在PC上编译内核，漏了对intrid的支持，后来做了笔记，时间太久了，仅供参考：

复制代码 CONFIG_BLK_DEV_INITRD这一项一定要选上，否则将引导新内核时将出现以下提示： No filesystem could mount root, tried: kernel panic - not syncing: VFS: Unable to mount root fs on unknow-block(0,0)

你去看看.config文件，搜索CONFIG_BLK_DEV_INITRD，应该就能知道这个选项处于什么位置了。

这个问题多半是因为yaffs的根文件系统没有正确烧录所至。但原因很多，难以确定。

VFS: Cannot open root device "hda1" or unknown-block(2,0)
Please append a correct "root=" boot option; here are the available partitions:
1f00       2048 mtdblock0 (driver?)
1f01       8192 mtdblock1 (driver?)
1f02      55296 mtdblock2 (driver?)

这个出错信息说明内核所知道的rootfs所在的存储设备是hda1, 然而，实际上当前合法的设备只有mtdblock0,1,2也就是NAND Flash的三个分区。

我也出现这个问题

Root-NFS: No NFS server available, giving up.
VFS: Unable to mount root fs via NFS, trying floppy.
VFS: Cannot open root device "mtdblock" or unknown-block(2,0)
Please append a correct "root=" boot option; here are the available partitions:
1f00       1024 mtdblock0 (driver?)
1f01       2048 mtdblock1 (driver?)
1f02      40960 mtdblock2 (driver?)
1f03      21504 mtdblock3 (driver?)
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)

VFS: Cannot open root device "mtdblock" or unknown-block(2,0)
Please append a correct "root=" boot option; here are the available partitions:
1f00       1024 mtdblock0 (driver?)
1f01       2048 mtdblock1 (driver?)
1f02      40960 mtdblock2 (driver?)
1f03      21504 mtdblock3 (driver?)

你不觉得mtdblock后面少了一个数字吗?

usbmon: debugfs is not available
s3c2410-ohci s3c2410-ohci: S3C24XX OHCI
s3c2410-ohci s3c2410-ohci: new USB bus registered, assigned bus number 1
s3c2410-ohci s3c2410-ohci: irq 42, io mem 0x49000000
usb usb1: configuration #1 chosen from 1 choice
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected
mice: PS/2 mouse device common for all mice
S3C24XX RTC, (c) 2004,2006 Simtec Electronics
s3c2440-i2c s3c2440-i2c: slave address 0x10
s3c2440-i2c s3c2440-i2c: bus frequency set to 390 KHz
s3c2440-i2c s3c2440-i2c: i2c-0: S3C I2C adapter
TCP cubic registered
NET: Registered protocol family 1
drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
Root-NFS: No NFS server available, giving up.
VFS: Unable to mount root fs via NFS, trying floppy.
VFS: Cannot open root device "mtdblock3" or unknown-block(2,0)
Please append a correct "root=" boot option; here are the available partitions:
1f00       2048 mtdblock0 (driver?)
1f01       8192 mtdblock1 (driver?)
1f02     120832 mtdblock2 (driver?)
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)


我的也是这种问题 还没解决

-友善之臂-mini2440-128M-   busybox-1.7.0

Please append a correct "root=" boot option; here are the available partitions:
1f00       2048 mtdblock0 (driver?)
1f01       8192 mtdblock1 (driver?)
1f02     120832 mtdblock2 (driver?)

看不懂英文吗？当前有的MTD分区只有mtdblock0,1,2

你传递的启动参数是什么呢？