RCR_ENTRY_PATTERN
if ((rcr_entry == 0x0) || (rcr_entry == RCR_ENTRY_PATTERN))
if ((rcr_entry == 0x0) || (rcr_entry == RCR_ENTRY_PATTERN)) {
*((uint64_t *)rcr_desc_rd_head_p) = RCR_ENTRY_PATTERN;