CONFIG_MACH_AT91SAM9261EK is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
Atmel AT91SAM9261-EK Evaluation Kit
modulename: board-sam9261ek.ko
configname: CONFIG_MACH_AT91SAM9261EK
Linux Kernel Configuration
└─>Atmel Non-DT world
└─>Atmel AT91SAM9261-EK Evaluation Kit
In linux kernel since version 2.6.20 (release Date: 2007-02-04)
Select this if you are using Atmel's AT91SAM9261-EK Evaluation Kit.
<http://www.atmel.com/dyn/products/tools_card.asp?tool_id=3820>
<http://www.atmel.com/dyn/products/tools_card.asp?tool_id=3820>