util/inteltool: Use appropriate channel for printing timings

At least one channel must be present, so print an error if there is
not. However, we cannot always assume it will be the first channel,
so make the appropriate selection when printing the timings.

Found-by: Coverity Scan #1370{584,585,588,589,590-596,600}
Signed-off-by: Jacob Garber <jgarber1@ualberta.ca>
Change-Id: I6b59989242e498474782876302e0850e3e4cf2d3
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32713
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

1 files changed, 20 insertions, 12 deletions

diff --git a/util/inteltool/ivy_memory.c b/util/inteltool/ivy_memory.c
index 8ce861127b..16c1d8920c 100644
--- a/util/inteltool/ivy_memory.c
+++ b/util/inteltool/ivy_memory.c
@@ -97,6 +97,11 @@ void ivybridge_dump_timings(const char *dump_spd_file)
 		rankmap[channel] = read_mchbar32(0xc14 + 0x100 * channel) >> 24;
 	}
 
+	if ((rankmap[0] == 0) && (rankmap[1] == 0)) {
+		fputs("Error: no memory channels found\n", stderr);
+		exit(1);
+	}
+
 	two_channels = rankmap[0] && rankmap[1];
 
 	mr0[0] = read_mchbar32(0x0004);
@@ -172,49 +177,52 @@ void ivybridge_dump_timings(const char *dump_spd_file)
 
 	printf(".reg_4004_b30 = { %d, %d },\n", reg_4004_b30[0],
 	       reg_4004_b30[1]);
+
+	channel = (rankmap[0] != 0) ? 0 : 1;
+
 	if (two_channels && tFAW[0] != tFAW[1])
 		printf("/* tFAW mismatch: %d, %d */\n", tFAW[0], tFAW[1]);
-	print_time("tFAW", tFAW[0], tCK);
+	print_time("tFAW", tFAW[channel], tCK);
 	if (two_channels && tWTR[0] != tWTR[1])
 		printf("/* tWTR mismatch: %d, %d */\n", tWTR[0], tWTR[1]);
-	print_time("tWTR", tWTR[0], tCK);
+	print_time("tWTR", tWTR[channel], tCK);
 	if (two_channels && tCKE[0] != tCKE[1])
 		printf("/* tCKE mismatch: %d, %d */\n", tCKE[0], tCKE[1]);
-	print_time("tCKE", tCKE[0], tCK);
+	print_time("tCKE", tCKE[channel], tCK);
 	if (two_channels && tRTP[0] != tRTP[1])
 		printf("/* tRTP mismatch: %d, %d */\n", tRTP[0], tRTP[1]);
-	print_time("tRTP", tRTP[0], tCK);
+	print_time("tRTP", tRTP[channel], tCK);
 	if (two_channels && tRRD[0] != tRRD[1])
 		printf("/* tRRD mismatch: %d, %d */\n", tRRD[0], tRRD[1]);
-	print_time("tRRD", tRRD[0], tCK);
+	print_time("tRRD", tRRD[channel], tCK);
 
 	if (two_channels && tRAS[0] != tRAS[1])
 		printf("/* tRAS mismatch: %d, %d */\n", tRAS[0], tRAS[1]);
-	print_time("tRAS", tRAS[0], tCK);
+	print_time("tRAS", tRAS[channel], tCK);
 
 	if (two_channels && tCWL[0] != tCWL[1])
 		printf("/* tCWL mismatch: %d, %d */\n", tCWL[0], tCWL[1]);
-	print_time("tCWL", tCWL[0], tCK);
+	print_time("tCWL", tCWL[channel], tCK);
 
 	if (two_channels && tRP[0] != tRP[1])
 		printf("/* tRP mismatch: %d, %d */\n", tRP[0], tRP[1]);
-	print_time("tRP", tRP[0], tCK);
+	print_time("tRP", tRP[channel], tCK);
 
 	if (two_channels && tRCD[0] != tRCD[1])
 		printf("/* tRCD mismatch: %d, %d */\n", tRCD[0], tRCD[1]);
-	print_time("tRCD", tRCD[0], tCK);
+	print_time("tRCD", tRCD[channel], tCK);
 
 	if (two_channels && tXPDLL[0] != tXPDLL[1])
 		printf("/* tXPDLL mismatch: %d, %d */\n", tXPDLL[0], tXPDLL[1]);
-	print_time("tXPDLL", tXPDLL[0], tCK);
+	print_time("tXPDLL", tXPDLL[channel], tCK);
 
 	if (two_channels && tXP[0] != tXP[1])
 		printf("/* tXP mismatch: %d, %d */\n", tXP[0], tXP[1]);
-	print_time("tXP", tXP[0], tCK);
+	print_time("tXP", tXP[channel], tCK);
 
 	if (two_channels && tAONPD[0] != tAONPD[1])
 		printf("/* tAONPD mismatch: %d, %d */\n", tAONPD[0], tAONPD[1]);
-	print_time("tAONPD", tAONPD[0], tCK);
+	print_time("tAONPD", tAONPD[channel], tCK);
 
 	reg = read_mchbar32(0x4298);
 	if (reg != read_mchbar32(0x4698) && two_channels)