Merge pull request #2719 from dgarske/nxp_k64_mmcau

Fixes for NXP K64

wolfcrypt/src/sha256.c

@@ -410,6 +410,7 @@ static int InitSha256(wc_Sha256* sha256)
         if (ret != 0) {
             return ret;
         }
+
     #ifdef FREESCALE_MMCAU_CLASSIC_SHA
         cau_sha256_initialize_output(sha256->digest);
     #else
@@ -420,6 +421,9 @@ static int InitSha256(wc_Sha256* sha256)
         sha256->buffLen = 0;
         sha256->loLen   = 0;
         sha256->hiLen   = 0;
+    #ifdef WOLFSSL_SMALL_STACK_CACHE
+        sha256->W = NULL;
+    #endif
 
         return ret;
     }

wolfcrypt/src/tfm.c

@@ -86,13 +86,13 @@ WOLFSSL_LOCAL int sp_ModExp_4096(mp_int* base, mp_int* exp, mp_int* mod,
 #endif
 
 
-
+#ifndef WOLFSSL_SP_MATH
 /* math settings check */
 word32 CheckRunTimeSettings(void)
 {
     return CTC_SETTINGS;
 }
-
+#endif
 
 /* math settings size check */
 word32 CheckRunTimeFastMath(void)