RHEL 6 Installation Guide - 6.3.3. Use a boot option to specify a driver update disk

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Choose this method only for completely new drivers

This method only works to introduce completely new drivers, not to update existing drivers.

Type linux dd at the boot prompt at the start of the installation process and press Enter. The installer prompts you to confirm that you have a driver disk:

The driver disk prompt

Figure 6.6. The driver disk prompt
Insert the driver update disk that you created on CD, DVD, or USB flash drive and select Yes. The installer examines the storage devices that it can detect. If there is only one possible location that could hold a driver disk (for example, the installer detects the presence of a DVD drive, but no other storage devices) it will automatically load any driver updates that it finds at this location.

If the installer finds more than one location that could hold a driver update, it prompts you to specify the location of the update. Refer to to Section 6.4, “Specifying the location of a driver update image file or driver update disk” .