nb/intel/x4x: Fix unpopulated value

Previously, 0x0 was the value being used for an unpopulated dimm
on spd[62], however some DDR2 dimms have 0x0 as a valid value.
Now use 0xff which is an unused value even on DDR2/DDR3.

Change-Id: I55a91a6c3fe3733a7bb2abc45ca352c955c07c99
Signed-off-by: Damien Zammit <damien@zamaudio.com>
Reviewed-on: https://review.coreboot.org/15058
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Martin Roth <martinroth@google.com>

3 files changed, 14 insertions, 13 deletions

diff --git a/src/northbridge/intel/x4x/raminit.c b/src/northbridge/intel/x4x/raminit.c
index 6efdcd3bb3..4f5575ceae 100644
--- a/src/northbridge/intel/x4x/raminit.c
+++ b/src/northbridge/intel/x4x/raminit.c
@@ -41,14 +41,14 @@ static void sdram_read_spds(struct sysinfo *s)
 	FOR_EACH_DIMM(i) {
 		if (s->spd_map[i] == 0) {
 			/* Non-existent SPD address */
-			s->dimms[i].card_type = 0;
+			s->dimms[i].card_type = RAW_CARD_UNPOPULATED;
 			continue;
 		}
 		for (j = 0; j < 64; j++) {
 			status = spd_read_byte(s->spd_map[i], j);
 			if (status < 0) {
 				/* No SPD here */
-				s->dimms[i].card_type = 0;
+				s->dimms[i].card_type = RAW_CARD_UNPOPULATED;
 				break;
 			}
 			s->dimms[i].spd_data[j] = (u8) status;
diff --git a/src/northbridge/intel/x4x/raminit_ddr2.c b/src/northbridge/intel/x4x/raminit_ddr2.c
index 3dd00fb2b6..5acb12736b 100644
--- a/src/northbridge/intel/x4x/raminit_ddr2.c
+++ b/src/northbridge/intel/x4x/raminit_ddr2.c
@@ -1506,7 +1506,7 @@ static void dradrb_ddr2(struct sysinfo *s)
 	rankpop0 = 0;
 	rankpop1 = 0;
 	FOR_EACH_POPULATED_RANK(s->dimms, ch, r) {
-		if ((s->dimms[ch<<1].card_type && ((r) < s->dimms[ch<<1].ranks))) {
+		if (((s->dimms[ch<<1].card_type != RAW_CARD_UNPOPULATED) && ((r) < s->dimms[ch<<1].ranks))) {
 			i = ch << 1;
 		} else {
 			i = (ch << 1) + 1;
@@ -1541,7 +1541,7 @@ static void dradrb_ddr2(struct sysinfo *s)
 
 	// DRB
 	FOR_EACH_POPULATED_RANK(s->dimms, ch, r) {
-		if ((s->dimms[ch<<1].card_type && ((r) < s->dimms[ch<<1].ranks))) {
+		if (((s->dimms[ch<<1].card_type != RAW_CARD_UNPOPULATED) && ((r) < s->dimms[ch<<1].ranks))) {
 			i = ch << 1;
 		} else {
 			i = (ch << 1) + 1;
diff --git a/src/northbridge/intel/x4x/x4x.h b/src/northbridge/intel/x4x/x4x.h
index 17810aa3cb..e02ee02627 100644
--- a/src/northbridge/intel/x4x/x4x.h
+++ b/src/northbridge/intel/x4x/x4x.h
@@ -144,9 +144,10 @@
 
 #define TOTAL_CHANNELS 2
 #define TOTAL_DIMMS 4
+#define RAW_CARD_UNPOPULATED 0xff
 
-#define DIMM_IS_POPULATED(dimms, idx) (dimms[idx].card_type != 0)
-#define IF_DIMM_POPULATED(dimms, idx) if (dimms[idx].card_type != 0)
+#define DIMM_IS_POPULATED(dimms, idx) (dimms[idx].card_type != RAW_CARD_UNPOPULATED)
+#define IF_DIMM_POPULATED(dimms, idx) if (dimms[idx].card_type != RAW_CARD_UNPOPULATED)
 #define ONLY_DIMMA_IS_POPULATED(dimms, ch) ( \
 	(DIMM_IS_POPULATED(dimms, (ch == 0) ? 0 : 2) && \
 	!DIMM_IS_POPULATED(dimms, (ch == 0) ? 1 : 3)))
@@ -160,9 +161,9 @@
 	for (idx = 0; idx < TOTAL_DIMMS; ++idx)
 #define FOR_EACH_POPULATED_DIMM(dimms, idx) \
 	FOR_EACH_DIMM(idx) IF_DIMM_POPULATED(dimms, idx)
-#define CHANNEL_IS_POPULATED(dimms, idx) ((dimms[idx<<1].card_type != 0) || (dimms[(idx<<1) + 1].card_type != 0))
+#define CHANNEL_IS_POPULATED(dimms, idx) ((dimms[idx<<1].card_type != RAW_CARD_UNPOPULATED) || (dimms[(idx<<1) + 1].card_type != RAW_CARD_UNPOPULATED))
 #define CHANNEL_IS_CARDF(dimms, idx) ((dimms[idx<<1].card_type == 0xf) || (dimms[(idx<<1) + 1].card_type == 0xf))
-#define IF_CHANNEL_POPULATED(dimms, idx) if ((dimms[idx<<1].card_type != 0) || (dimms[(idx<<1) + 1].card_type != 0))
+#define IF_CHANNEL_POPULATED(dimms, idx) if ((dimms[idx<<1].card_type != RAW_CARD_UNPOPULATED) || (dimms[(idx<<1) + 1].card_type != RAW_CARD_UNPOPULATED))
 #define FOR_EACH_CHANNEL(idx) \
 	for (idx = 0; idx < TOTAL_CHANNELS; ++idx)
 #define FOR_EACH_POPULATED_CHANNEL(dimms, idx) \
@@ -170,11 +171,11 @@
 
 #define RANKS_PER_CHANNEL 4
 #define RANK_IS_POPULATED(dimms, ch, r) \
-	((dimms[ch<<1].card_type && ((r) < dimms[ch<<1].ranks)) || \
-	(dimms[(ch<<1) + 1].card_type && ((r) >= 2) && ((r) < (dimms[(ch<<1) + 1].ranks + 2))))
+	(((dimms[ch<<1].card_type != RAW_CARD_UNPOPULATED) && ((r) < dimms[ch<<1].ranks)) || \
+	((dimms[(ch<<1) + 1].card_type != RAW_CARD_UNPOPULATED) && ((r) >= 2) && ((r) < (dimms[(ch<<1) + 1].ranks + 2))))
 #define IF_RANK_POPULATED(dimms, ch, r) \
-	if ((dimms[ch<<1].card_type && ((r) < dimms[ch<<1].ranks)) || \
-	    (dimms[(ch<<1) + 1].card_type && ((r) >= 2) && ((r) < (dimms[(ch<<1) + 1].ranks + 2))))
+	if (((dimms[ch<<1].card_type != RAW_CARD_UNPOPULATED) && ((r) < dimms[ch<<1].ranks)) || \
+	    ((dimms[(ch<<1) + 1].card_type != RAW_CARD_UNPOPULATED) && ((r) >= 2) && ((r) < (dimms[(ch<<1) + 1].ranks + 2))))
 #define FOR_EACH_RANK_IN_CHANNEL(r) \
 	for (r = 0; r < RANKS_PER_CHANNEL; ++r)
 #define FOR_EACH_POPULATED_RANK_IN_CHANNEL(dimms, ch, r) \
@@ -243,7 +244,7 @@ struct timings {
 };
 
 struct dimminfo {
-	unsigned int	card_type; /* 0x0: unpopulated,
+	unsigned int	card_type; /* 0xff: unpopulated,
 				      0xa - 0xf: raw card type A - F */
 	enum chip_width	width;
 	enum chip_cap	chip_capacity;