sha256_via: add further comments on byte-swapping work
diff --git a/sha256_via.c b/sha256_via.c
index c03495b..8becfd7 100644
--- a/sha256_via.c
+++ b/sha256_via.c
@@ -42,6 +42,8 @@ bool scanhash_via(unsigned char *midstate, const unsigned char *data_in,
/* bitcoin gives us big endian input, but via wants LE,
* so we reverse the swapping bitcoin has already done (extra work)
+ * in order to permit the hardware to swap everything
+ * back to BE again (extra work).
*/
for (i = 0; i < 128/4; i++) {
uint32_t *data32 = (uint32_t *) data;