CONFIG_SA1100_JORNADA720 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

HP Jornada 720

modulename: jornada720.ko

configname: CONFIG_SA1100_JORNADA720

Linux Kernel Configuration
└─>SA11x0 Implementations
└─>HP Jornada 720
In linux kernel since version 2.6.12  
Say Y here if you want to build a kernel for the HP Jornada 720
handheld computer. See <http://www.hp.com/jornada/products/720>
for details.

source code: