NXP Semiconductors PXN2020 - 9.3.3 Features

Boot Assist Module (BAM)
PXN20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor 9-5
Figure 9-2. Serial Boot Flash Password
If the BAM fails to find a valid RCHW in internal-boot mode then serial-boot mode is entered. Therefore
a serial password must be provided for both values of the BOOTCFG bit.
9.3.3 Features
Because the MMU default out of reset is to allow access to the 4 KB range around the reset vector only,
the BAM program sets up the e200z6 core MMU to enable accesses to all MCU resources, as described in
Table 9-3.
Table 9-3. MMU Configuration for an Internal Boot
TLB
Entr
y
Region
Logical Base
Address
Physical Base
Address
Size Attributes
0 Peripheral bridge and BAM 0xFFF0_0000 0xFFF0_0000 1 MB Cache inhibited
Guarded
Big Endian
Global PID
1 Internal flash 0x0000_0000 0x0000_0000 256 MB Cache enabled
Not guarded
Big Endian
Global PID
Serial-boot flash password at 0x00FF_FDD8 – 0x00FF_FDDF:
0123456789101112131415
1111111011101101
Serial boot password (0x00FF_FDD8)–0xFEED (factory default)
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
1111101011001110
Serial boot password (0x00FF_FDDA)–0xFACE (factory default)
32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
1100101011111110
Serial boot password (0x00FF_FDDC)–0xCAFE (factory default)
48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
1011111011101111
Serial boot password (0x00FF_FDDE)– 0xBEEF (factory default)