Specifications

Programmers Model
ARM DUI 0447J Copyright © 2009-2014, ARM. All rights reserved. 4-15
ID052914 Non-Confidential
Table 4-10 shows the bit assignments.
4.4.8 Config Switch Register
The SYS_CFGSW Register characteristics are:
Purpose Contains the value for the
CONFSWITCH entry in the config.txt file. The
register contents are not used for system configuration, but you can read
the value from your user application.
Usage constraints There are no usage constraints.
Configurations Available in all configurations.
Attributes See Table 4-3 on page 4-8.
Figure 4-8 shows the bit assignments.
Figure 4-8 SYS_CFGSW Register bit assignments
Table 4-11 shows the bit assignments.
Table 4-10 SYS_FLASH Register bit assignments
Bits Name Reset Description
[31:1] -
0x0000000 Undefined, write ignored, read as zero
[0] FLASHWPn
b0 b0 Enables the Lock-Down mechanism.
The Lock-Down Block command puts
the NOR Flash memory blocks into
read-only state. The blocks cannot be
reprogrammed, erased or unlocked.
b1 Overrides the Lock-Down mechanism.
The Unlock Block command can
unlock previously locked down NOR
Flash memory blocks.
Note
Power on reset state is b0 . The boot monitor software
sets the bit to
b1 .
All blocks revert to locked state during powerdown or
reset to prevent data corruption.
31 0
Undefined
Soft configswitch
87
Table 4-11 SYS_CFGSW Register bit assignments
Bits Access Name Reset Description
[31:8] Read-only - - -
[7:0] Read-write Soft config switch Set to value of CONFIGSWITCH
in the
config.txt file.
User applications can read these switch settings.
See the ARM
®
Versatile
™
Express Boot Monitor
Reference Manual for more switch settings.