Write Protection Feature; Table 3-3: Write Protection Level Set By Fwpd And Ewp; Table 3-4: Non-Volatile Memories On The Cp6930 - Kontron CP6930 User Manual

3.4 Write Protection Feature

The CP6930 supports hardware driven write protection for all non-volatile memory devices. Depending on
the device, the protection is implemented either by a dedicated write protection signal, by disabling the
write enable signal, or the whole interface.
Three levels of HW write protection are supported: unprotected, standard and enhanced write protection.
The protection level is chosen by the combination of the state of on-board jumper (FWPD, see chapter 3.6.4)
and a backplane signal (EWP). The backplane signal is located on connector J4, pin A9. If left open, the sig-
nal is inactive. If pulled to GND, the signal is active.
The following table shows how to configure the desired write protection level. Default setting is 'standard'.
Table 3-3: Write protection level set by FWPD and EWP
FWPD
Jumper
set don't care
open inactive (3.3V or open)
open active (GND)
Standard write protection provides protection for Unit Computer Flash data, enhanced write protection pro-
vides protection for all memories.
Table 3-4: Non-volatile memories on the CP6930
Description
Unit Computer Bootloader + Firmware standard, enhanced
IPMI Firmware
FRU Data
Unit Computer Config EEPROM
PM internal Flash
EWP
Write Protection Level
Signal
unprotected
standard
enhanced
Protected by Level
enhanced
enhanced
enhanced
enhanced
24
Functional Description
CP6930 User Guide
www.kontron.com