Disabling Writes To Flash/Eeprom (Nvram); Disabling Nvram Writes; Dnr-X-1G Nic/Cpu Core Module And Carrier - UEi RACKtangle DNR-12-1G Series User Manual

4.11 Disabling
Writes to
Flash/
EEPROM
(NVRAM)
4.11.1 Disabling
NVRAM Writes
STEP 1: Turn OFF power to the DNR-X-1G system using the toggle switch at the front of
STEP 2: Identify the DNR-CPU-1000 module in your DNR-X-1G chassis, and using a
COM
© Copyright 2018
United Electronic Industries, Inc.
DNR-X-1G Series RACKtangle and HalfRACK Systems
DNR-X-1G systems include a hardware feature that provides the option of
disabling writes to non-volatile memory (NVRAM).
By installing the NVRAM protection jumper, all writes to flash and EEPROM will
be disabled on the hardware level.
NOTE: Writes to the EEPROM on the DNx-AO-358 and DNx-AO-364 are not
disabled by this process.
Applications that must disable all NVRAM writes should not include the
DNx-AO-358 and DNx-AO-364 products in their system.
Note that installing the NVRAM protection jumper requires the DNR-CPU-1000/
DNR-CPU-1000-XX module in the DNR-X-1G chassis to have a PCB board
removed and replaced. In general UEI does not recommend that users remove
PCB boards from their carriers: over-torquing screws or bending PCB boards
can permanently damage the DNR-CPU-1000 modules. UEI can install and
remove jumpers as needed, if you have any concerns.
To disable writes to non-volatile memory, do the following:
the system.
torque screwdriver, loosen the thumbscrews securing the module to the chassis.
Lift the insertion/extraction lever and remove the CPU/NIC board
(DNR-CPU-1000/-XX) from the enclosure. (Refer to figure below).
RS-232
DB-9 Connector
R/W USR
for serial port
3.3
PG 24
Sync/Reset
Diagnostic
NIC 2
Port - NIC2
Primary Ethernet
SD Card
Port - NIC1
NIC 1
USB B
USB A
Front Panel
Figure 4-17. DNR-X-1G NIC/CPU Core Module and Carrier
October 2018
Installation and Configuration
0
Isometric of Carrier
(holds two circuit boards – CPU and NIC)
Chapter 4 66
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