Change in coreboot[master]: soc/amd/common/block/pi/amd_late_init.c: Fix part number

[Richard Spiegel (Code Review)]

Richard Spiegel has uploaded this change for review. ( https://review.coreboot.org/23825

Change subject: soc/amd/common/block/pi/amd_late_init.c: Fix part number
......................................................................

soc/amd/common/block/pi/amd_late_init.c: Fix part number

Some DIMMs have invalid strings when it comes to part number (bytes
0x149-0x15c). It should be ASCIIZ with unused space filled with white
spaces (ASCII 0x20). Byte 20 should be 0, all others should be ASCII.
Create a test that detects invalid strings and replace them with "NA",
while truncating valid strings to 18 characters (dimm->module_part_number
has 19 bytes and byte 19 has to be 0).

BUG=b:73122207
TEST=Build, boot and record serial output for kahlee while injecting
different strings to dmi17->PartNumber. Use code to examine SMBIOS,
while testing different valid and invalid strings, testing corner cases.
Remove string injection before committing.

Change-Id: I427262873f9ec80f459245e5f509e28a68de3074
Signed-off-by: Richard Spiegel 
---
M src/soc/amd/common/block/pi/amd_late_init.c
1 file changed, 35 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/25/23825/1

diff --git a/src/soc/amd/common/block/pi/amd_late_init.c b/src/soc/amd/common/block/pi/amd_late_init.c
index 68f15ed..66684af 100644
--- a/src/soc/amd/common/block/pi/amd_late_init.c
+++ b/src/soc/amd/common/block/pi/amd_late_init.c
@@ -25,6 +25,35 @@
 #include <amdblocks/agesawrapper.h>
 #include <amdblocks/agesawrapper_call.h>

+static int validate_part_number(char *buffer)
+{
+	int valid, space, i;
+	char ch;
+
+	valid = 0; /* valid until proven invalid */
+	space = 0;
+	for (i = 0; i < 19; i++) {
+		ch = buffer[i];
+		if (ch < 0x20)
+			valid = -1;
+		if (ch == 0x20)
+			space++;
+		if (ch > 0x20) {
+			if (space > 1)
+				valid = -1;
+			else
+				space = 0;
+		}
+	}
+	/*
+	 * dimm->module_part_number is 19 bytes, with last byte 0.
+	 * dmi17->PartNumber is 21 bytes with last byte 0. So truncate
+	 * string just in case it's valid.
+	 */
+	buffer[18] = 0;
+	return valid;
+}
+
 static void transfer_memory_info(TYPE17_DMI_INFO *dmi17, struct dimm_info *dimm)
 {
    size_t len, destlen;
@@ -49,8 +78,12 @@
    dimm->bus_width = dmi17->DataWidth;
    dimm->mod_id = dmi17->ManufacturerIdCode;
    dimm->bank_locator = 0;
-	strncpy((char *)dimm->module_part_number, "NA",
-			sizeof(dimm->module_part_number));
+	if (validate_part_number(dmi17->PartNumber))
+		strncpy((char *)dimm->module_part_number, "NA",
+				sizeof(dimm->module_part_number));
+	else
+		strncpy((char *)dimm->module_part_number, dmi17->PartNumber,
+				sizeof(dimm->module_part_number));
 }

static void prepare_dmi_17(void *unused)