I am using LFS . Is it possible to modify the BIOS settings/parameters from Linux, either in GUI or in Command-line Interface ?
Interesting question. I was once looking for a similar applications running on Windows or Linux in order to modify BIOS settings from Windows/Linux. This could be helpful in environments where no console access is possible (remote servers).
Unfortunately it looks like there is no generic tool which is still maintained. In fact one could edit the CMOS from Windows or Linux but this requires knowledge about data structures which depend on the BIOS and Option-ROMs used AFAIK. Therefore it would be very difficult to build a generic tool which correctly sets CMOS settings compatible to your hardware.
There used to be a software called WinBIOS which can at least perform some basic operations like restoring the default settings on Award, Ami and Phoenix. However I don't know about Linux versions.
I consider it to be quite dangerous to mess around with CMOS data from operating system without knowing the exact specification on how the data is stored (assuming that each BIOS version and brand might have different structures).