CONFIG_RADSTONE_PPC7D is not available for thedefaultarchitecture x86.
Result is shown for architecture ppc

Radstone Technology PPC7D board

modulename: pci_auto.ko

and/or

radstone_ppc7d.ko

configname: CONFIG_RADSTONE_PPC7D

Machine Type
└─>Radstone Technology PPC7D board
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
source code:
arch/ppc/syslib/pci_auto.c