[linux] 5.x: userland writes to /usr/lib64/firefox/libxul.so

[Udo van den Heuvel]

On 27-04-2020 17:02, Udo van den Heuvel wrote:
> Lezers,
> 
> Nou, DMi rapporteerde 1.2V.
> In het BIOS was het ook 1.2V.
> Staat nu, in de BIOS, op 1.3V.
> Maar dmidecode rapporteert nog steeds 1.2V.
> Meteen rebooten en in de BIOS kijken levert 1.3V op.

Andere tooling lijkt aan te geven dat de DIMM zelf inderdaad 1.2V zou
aangeven als de benodigde spanning:

# ./decode-dimms.pl
# decode-dimms version $Revision$

Memory Serial Presence Detect Decoder
By Philip Edelbrock, Christian Zuckschwerdt, Burkart Lingner,
Jean Delvare, Trent Piepho and others
Use of uninitialized value $b in numeric eq (==) at ./decode-dimms.pl
line 431.
(knip)
Use of uninitialized value in sprintf at ./decode-dimms.pl line 2174.


Decoding EEPROM: /sys/bus/i2c/drivers/eeprom/1-0052
Guessing DIMM is in                              bank 3

---=== SPD EEPROM Information ===---
EEPROM CRC of bytes 0-125                        OK (0x51ED)
# of bytes written to SDRAM EEPROM               384
Total number of bytes in EEPROM                  512
Fundamental Memory type                          DDR4 SDRAM
SPD Revision                                     1.0
Module Type                                      UDIMM
EEPROM CRC of bytes 128-253                      OK (0x58B6)

---=== Memory Characteristics ===---
Maximum module speed                             2132 MHz (PC4-17000)
Size                                             8192 MB
Banks x Rows x Columns x Bits                    16 x 16 x 10 x 64
SDRAM Device Width                               8 bits
Ranks                                            1
AA-RCD-RP-RAS (cycles)                           15-15-15-36
Supported CAS Latencies                          16T, 15T, 14T, 13T,
12T, 11T, 10T, 9T

---=== Timings at Standard Speeds ===---
AA-RCD-RP-RAS (cycles) as DDR4-1866              13-13-14-31
AA-RCD-RP-RAS (cycles) as DDR4-1600              11-11-12-27

---=== Timing Parameters ===---
Minimum Cycle Time (tCKmin)                      0.938 ns
Maximum Cycle Time (tCKmax)                      1.500 ns
Minimum CAS Latency Time (tAA)                   13.500 ns
Minimum RAS to CAS Delay (tRCD)                  13.500 ns
Minimum Row Precharge Delay (tRP)                14.061 ns
Minimum Active to Precharge Delay (tRAS)         33.000 ns
Minimum Active to Auto-Refresh Delay (tRC)       46.500 ns
Minimum Recovery Delay (tRFC1)                   350.000 ns
Minimum Recovery Delay (tRFC2)                   260.000 ns
Minimum Recovery Delay (tRFC4)                   160.000 ns
Minimum Four Activate Window Delay (tFAW)        21.000 ns
Minimum Row Active to Row Active Delay (tRRD_S)  3.701 ns
Minimum Row Active to Row Active Delay (tRRD_L)  5.300 ns
Minimum CAS to CAS Delay (tCCD_L)                5.356 ns

---=== Other Information ===---
Package Type                                     Monolithic
Maximum Activate Count                           Unlimited
Post Package Repair                              Not supported
Module Nominal Voltage                           1.2 V
Thermal Sensor                                   No

---=== Physical Characteristics ===---
Module Height                                    32 mm
Module Thickness                                 2 mm front, 2 mm back
Module Reference Card                            A revision 0

---=== Manufacturer Data ===---
Module Manufacturer                              Undefined
Part Number                                      Undefined


Decoding EEPROM: /sys/bus/i2c/drivers/eeprom/1-0053
Guessing DIMM is in                              bank 4

---=== SPD EEPROM Information ===---
EEPROM CRC of bytes 0-125                        OK (0x51ED)
# of bytes written to SDRAM EEPROM               384
Total number of bytes in EEPROM                  512
Fundamental Memory type                          DDR4 SDRAM
SPD Revision                                     1.0
Module Type                                      UDIMM
EEPROM CRC of bytes 128-253                      OK (0x58B6)

---=== Memory Characteristics ===---
Maximum module speed                             2132 MHz (PC4-17000)
Size                                             8192 MB
Banks x Rows x Columns x Bits                    16 x 16 x 10 x 64
SDRAM Device Width                               8 bits
Ranks                                            1
AA-RCD-RP-RAS (cycles)                           15-15-15-36
Supported CAS Latencies                          16T, 15T, 14T, 13T,
12T, 11T, 10T, 9T

---=== Timings at Standard Speeds ===---
AA-RCD-RP-RAS (cycles) as DDR4-1866              13-13-14-31
AA-RCD-RP-RAS (cycles) as DDR4-1600              11-11-12-27

---=== Timing Parameters ===---
Minimum Cycle Time (tCKmin)                      0.938 ns
Maximum Cycle Time (tCKmax)                      1.500 ns
Minimum CAS Latency Time (tAA)                   13.500 ns
Minimum RAS to CAS Delay (tRCD)                  13.500 ns
Minimum Row Precharge Delay (tRP)                14.061 ns
Minimum Active to Precharge Delay (tRAS)         33.000 ns
Minimum Active to Auto-Refresh Delay (tRC)       46.500 ns
Minimum Recovery Delay (tRFC1)                   350.000 ns
Minimum Recovery Delay (tRFC2)                   260.000 ns
Minimum Recovery Delay (tRFC4)                   160.000 ns
Minimum Four Activate Window Delay (tFAW)        21.000 ns
Minimum Row Active to Row Active Delay (tRRD_S)  3.701 ns
Minimum Row Active to Row Active Delay (tRRD_L)  5.300 ns
Minimum CAS to CAS Delay (tCCD_L)                5.356 ns

---=== Other Information ===---
Package Type                                     Monolithic
Maximum Activate Count                           Unlimited
Post Package Repair                              Not supported
Module Nominal Voltage                           1.2 V
Thermal Sensor                                   No

---=== Physical Characteristics ===---
Module Height                                    32 mm
Module Thickness                                 2 mm front, 2 mm back
Module Reference Card                            A revision 0

---=== Manufacturer Data ===---
Module Manufacturer                              Undefined
Part Number                                      Undefined


Number of SDRAM DIMMs detected and decoded: 2