CONFIG_MACH_AT91SAM9263EK is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
Atmel AT91SAM9263-EK Evaluation Kit
modulename: board-sam9263ek.ko
configname: CONFIG_MACH_AT91SAM9263EK
Linux Kernel Configuration
└─>Atmel AT91 System-on-Chip
└─>Atmel AT91SAM9263-EK Evaluation Kit
In linux kernel since version 2.6.21 (release Date: 2007-04-25)
Select this if you are using Atmel's AT91SAM9263-EK Evaluation Kit.
<http://www.atmel.com/dyn/products/tools_card.asp?tool_id=4057>
<http://www.atmel.com/dyn/products/tools_card.asp?tool_id=4057>