CONFIG_KATMAI is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

Katmai

configname: CONFIG_KATMAI

Linux Kernel Configuration
└─>Katmai
In linux kernel since version 2.6.25 (release Date: 2008-04-16)  
This option enables support for the AMCC PPC440SPe evaluation board.

selects
CONFIG_PPC44x_SIMPLE
CONFIG_440SPe
CONFIG_PCI
CONFIG_PPC4xx_PCI_EXPRESS
CONFIG_PCI_MSI
CONFIG_PCC4xx_MSI

depends
CONFIG_44x