在VMWARE虚拟机下安装RHEL7.0，启动时有以下提示。经网上搜索，答复为floppy及piix4_smbus设备加载时找不到设备所致。

　　解决办法如下：

floppy，在BIOS里禁用软驱，重启

piix4_smbus，先检查一下是否有加载piix4，如有把i2c_piix4加入黑名单，启动时不加载此模块

# lsmod | grep i2c_piix4

# vi  /etc/modprobe.d/blacklist.conf

blacklist i2c_piix4

其他的方法可参考

Added 

• blacklist floppy

to 
/etc/modprobe.d/blacklist.conf
and rebooted

Added 

• alias floppy off
  

to 
/etc/modprobe.conf
and rebooted

disable the floppy kernel module by doing this:

• echo "blacklist floppy" | sudo tee /etc/modprobe.d/nofloppy.conf
  

The only real solution is to disable the floppy driven in your vm‘s BIOS (as mentioned by gerald_clark)

官方文档的方法：

Boot pauses probing floppy device

On some machines (mostly laptops with removable floppy drives), boot will pause while the (non-existant) floppy device is probed. A series of the following messages will appear:

end_request: I/O error, dev fd0, sector 0
end_request: I/O error, dev fd0, sector 0
Buffer I/O error on device fd0, logical block 0

This is caused by initrd‘s nash searching for filesystem labels on the floppy device. This problem can be avoided by adding floppy.allowed_drive_mask=0 to the kernel boot options.

RHEL7.0启动时end_request I/O error及piix4_smbus错误提示处理