MEMATTR_NC
if ((s1 & GENMASK(3, 2)) == MEMATTR_NC ||
(s2 & GENMASK(3, 2)) == MEMATTR_NC)
final = MEMATTR_NC;
if (final != MEMATTR_NC) {
final = MEMATTR_NC;
reg |= FIELD_PREP(CH_LINK_MEMATTR, coherent ? MEMATTR_WB : MEMATTR_NC);
FIELD_PREP(CH_CFG_MEMATTR, MEMATTR_NC)