CONFIG_CRYPTO_SHA256_SPARC64 is not available for thedefaultarchitecture x86.
Result is shown for architecture 64BIT

SHA224 and SHA256 digest algorithm (SPARC64)

modulename: sha256-sparc64.ko

configname: CONFIG_CRYPTO_SHA256_SPARC64

Linux Kernel Configuration
└─>Cryptographic API
└─>SHA224 and SHA256 digest algorithm (SPARC64)
In linux kernel since version 3.1 (release Date: 2011-10-24)  
SHA-256 secure hash standard (DFIPS 180-2) implemented
using sparc64 crypto instructions, when available.

source code:
arch/sparc/crypto/