以下是笔者在制作LFS过程中，遇到的最大困难的解决示例

使用LFS版本为6.3，内核版本为2.6.22.5

--- 开机错误提示
Root-NFS: No NFS server available, giving up.
VFS: Unable to mount root fs via NFS, trying floppy.
VFS: Insert root floppy and press ENTER

VFS: Cannot open root device "sda9" or unknow-block(2,0)
Please append a correct "root=" boot option; here are the available partitions:
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)

--- 在宿主机查看硬件配置
$ lspci | grep -i "sata"
00:1f.2 SATA controller: Intel Corporation 82801GBM/GHM (ICH7 Family) SATA AHCI Controller (rev 01)
$ lspci | grep -i "ide"
00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE Controller (rev 01)

--- 内核选项配置
$ make menuconfig

Device Drivers
|---> SCSI device support
      |---> <*> SCSI device support
      |---> <*> SCSI disk support
|---> <*> Serial ATA (prod) and Parallel ATA (experimental) drivers
      |---> <*> AHCI SATA support
      |---> <*> Intel ESB, ICH, PIIX3, PIIX4 PATA/SATA support (NEW)
      |---> <*> Intel PATA old PIIX support (NEW)
File systems
|---> <*> Ext3 journalling file system support
|---> [*]   Ext3 extended attributes
|---> [*]     Ext3 POSIX Access Control Lists

--- 验证配置选项
$ grep -i sata .config | grep "^[^#]"
CONFIG_SATA_AHCI=y
$ grep -i scsi .config | grep "^[^#]"
CONFIG_SCSI=y
CONFIG_SCSI_NETLINK=y
CONFIG_SCSI_WAIT_SCAN=m
CONFIG_SCSI_SPI_ATTRS=y
CONFIG_SCSI_FC_ATTRS=y
CONFIG_SCSI_AIC7XXX=y
CONFIG_SCSI_AIC79XX=y
$ grep -i ahci .config | grep "^[^#]"
CONFIG_SATA_AHCI=y
$

Q.E.D. 重新编译内核，重启，引导成功

lfs