Print the physical characteristics of unbuffered, registered and
load-reduced DDR4 SDRAM modules.
---
eeprom/decode-dimms | 22 +++++++++++++++++++++-
1 file changed, 21 insertions(+), 1 deletion(-)
--- i2c-tools.orig/eeprom/decode-dimms 2017-11-17 11:25:15.453970328 +0100
+++ i2c-tools/eeprom/decode-dimms 2017-11-17 11:27:11.401380668 +0100
@@ -1404,6 +1404,7 @@ sub ddr3_mtb_ftb($$$$)
return $byte1 * $mtb + $byte2 * $ftb / 1000;
}
+# Also works for DDR4
sub ddr3_reference_card($$)
{
my ($rrc, $ext) = @_;
@@ -1727,7 +1728,7 @@ use constant DDR4_UNBUFFERED => 1;
use constant DDR4_REGISTERED => 2;
use constant DDR4_LOAD_REDUCED => 4;
-# Parameter: EEPROM bytes 0-383 (using 1-125)
+# Parameter: EEPROM bytes 0-383 (using 1-130)
sub decode_ddr4_sdram($)
{
my $bytes = shift;
@@ -1915,6 +1916,25 @@ sub decode_ddr4_sdram($)
printl("Thermal Sensor",
$bytes->[14] & 0x80 ? "TSE2004 compliant" : "No");
+
+# type-specific settings
+ if ($module_types[$bytes->[3] & 0x0f]->{family} == DDR4_UNBUFFERED ||
+ $module_types[$bytes->[3] & 0x0f]->{family} == DDR4_REGISTERED ||
+ $module_types[$bytes->[3] & 0x0f]->{family} == DDR4_LOAD_REDUCED) {
+ prints("Physical Characteristics");
+
+ my $height = $bytes->[128] & 0x1f;
+ printl("Module Height",
+ $height == 0x00 ? "15 mm or less" :
+ $height == 0x1f ? "more than 45 mm" :
+ sprintf("%u mm", $height + 15));
+ printl("Module Thickness",
+ sprintf("%d mm front, %d mm back",
+ ($bytes->[129] & 0x0f) + 1,
+ (($bytes->[129] >> 4) & 15) + 1));
+ printl("Module Reference Card",
+ ddr3_reference_card($bytes->[130], $bytes->[128]));
+ }
}
# Parameter: EEPROM bytes 0-127 (using 4-5)
--
Jean Delvare
SUSE L3 Support
