CONFIG_ARCH_H1940 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

IPAQ H1940

modulename: mach-h1940.ko

and/or

configname: CONFIG_ARCH_H1940

Linux Kernel Configuration
└─>S3C24XX Implementations
└─>IPAQ H1940
In linux kernel since version 2.6.12  
Say Y here if you are using the HP IPAQ H1940

<http://www.handhelds.org/projects/h1940.html>.

source code:
arch/arm/mach-s3c2410/mach-h1940.c