CONFIG_SOC_AT91SAM9 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_SOC_AT91SAM9 (not configurable)

modulename: at91sam9.ko

and/or

sam9_smc.ko

configname: CONFIG_SOC_AT91SAM9

Linux Kernel Configuration
└─>SOC_AT91SAM9
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
arch/arm/mach-at91/sam9_smc.c

depends
CONFIG_ARCH_AT91 |
| CONFIG_ARCH_MULTI_V5