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Freescale MPC7448hpc2 (Taiga) board
Created 08/11/2006 Roy Zang
MPC7448hpc2 (Taiga) board is a high-performance PowerPC server reference
design, which is optimized for high speed throughput between the processor and
the memory, disk drive and Ethernet port subsystems.
MPC7448hpc2(Taiga) is designed to the micro-ATX chassis, allowing it to be
used in 1U or 2U rack-mount chassis¡¯, as well as in standard ATX/Micro-ATX
Building U-Boot
The mpc7448hpc2 code base is known to compile using:
Binutils 2.15, Gcc 3.4.3, Glibc 2.3.3
$ make mpc7448hpc2_config
Configuring for mpc7448hpc2 board...
$ make
Memory Map
The memory map is setup for Linux to operate properly.
The mapping is:
Range Start Range End Definition Size
0x0000_0000 0x7fff_ffff DDR 2G
0xe000_0000 0xe7ff_ffff PCI Memory 128M
0xfa00_0000 0xfaff_ffff PCI IO 16M
0xfb00_0000 0xfbff_ffff PCI Config 16M
0xfc00_0000 0xfc0f_ffff NVRAM/CADMUS 1M
0xfe00_0000 0xfeff_ffff PromJet 16M
0xff00_0000 0xff80_0000 FLASH (boot flash) 8M
0xff80_0000 0xffff_ffff FLASH (second half flash) 8M
Using Flash
The MPC7448hpc2 board has two "banks" of flash, each 8MB in size
(2^23 = 0x00800000).
Note: the "bank" here refers to half of the flash. In fact, there is only one
bank of flash, which is divided into low and high half. Each is controlled by
the most significant bit of the address bus. The so called "bank" is only for
There is a switch which allows the "bank" to be selected. The switch
settings for updating flash are given below.
The u-boot commands for copying the boot-bank into the secondary bank are
as follows:
erase ff800000 ff880000
cp.b ff000000 ff800000 80000
U-boot commands for downloading an image via tftp and flashing
it into the secondary bank:
tftp 10000 <u-boot.bin.image>
erase ff000000 ff080000
cp.b 10000 ff000000 80000
After copying the image into the second bank of flash, be sure to toggle
SW3[4] on board before resetting the board in order to set the
secondary bank as the boot-bank.
Board Switches
Most switches on the board should not be changed. The most frequent
user-settable switches on the board are used to configure
the flash banks and determining the PCI frequency.
SW1[1-5]: Processor core voltage
12345 Core Voltage
SW1=01111 1.000V.
SW1=01101 1.100V.
SW1=01011 1.200V.
SW1=01001 1.300V only for MPC7447A.
SW2[1-6]: CPU core frequency
CPU Core Frequency (MHz)
Bus Frequency
123456 100 133 167 200 Ratio
SW2=101100 500 667 833 1000 5x
SW2=100100 550 733 917 1100 5.5x
SW2=110100 600 800 1000 1200 6x
SW2=010100 650 866 1083 1300 6.5x
SW2=001000 700 930 1167 1400 7x
SW2=000100 750 1000 1250 1500 7.5x
SW2=110000 800 1066 1333 1600 8x
SW2=011000 850 1333 1417 1700 8.5x only for MPC7447A
SW2=011110 900 1200 1500 1800 9x
This table shows only a subset of available frequency options; see the CPU
hardware specifications for more information.
SW2[7-8]: Bus Protocol and CPU Reset Option
SW2=0 System bus uses MPX bus protocol
SW2=1 System bus uses 60x bus protocol
SW2=0 TSI108 can cause CPU reset
SW2=1 TSI108 can not cause CPU reset
SW3[1-8] system options
SW3=xxx Connected to GPIO[0:2] on TSI108
SW3=0 CPU boots from low half of flash
SW3=1 CPU boots from high half of flash
SW3=0 SATA and slot2 connected to PCI bus
SW3=1 Only slot1 connected to PCI bus
SW3=0 USB connected to PCI bus
SW3=1 USB disconnected from PCI bus
SW3=0 Flash is write protected
SW3=1 Flash is NOT write protected
SW3=0 CPU will boot from flash
SW3=1 CPU will boot from PromJet
SW4[1-3]: System bus frequency
Bus Frequency (MHz)
SW4=010 183
SW4=011 100
SW4=100 133
SW4=101 166 only for MPC7447A
SW4=110 200 only for MPC7448
others reserved
SW4[4-6]: DDR2 SDRAM frequency
Bus Frequency (MHz)
SW4=000 external clock
SW4=011 system clock
SW4=100 133
SW4=101 166
SW4=110 200
others reserved
SW4[7-8]: PCI/PCI-X frequency control
SW4=0 PCI/PCI-X bus operates normally
SW4=1 PCI bus forced to PCI-33 mode
SW4=0 PCI-X mode at 133 MHz allowed
SW4=1 PCI-X mode limited to 100 MHz