Hi Misra, this forum is really not good at support finboard that's designed by third party, have you tried to get support from the finboard website FinBoard?
Yet this error comes from arch/blackfin/kernel/setup.c, failed to validate the CPUID, do you select a matched CPU and silicon version (in make linux-menuconfig -> blackfin processor options) for your board? you may try to check by starting from this.
