123 lines
3.1 KiB
Plaintext
123 lines
3.1 KiB
Plaintext
Overview
|
|
--------
|
|
The MPC8544DS system is similar to the 85xx CDS systems such
|
|
as the MPC8548CDS due to the similar E500 core. However, it
|
|
is placed on the same board as the 8641 HPCN system.
|
|
|
|
|
|
Flash Banks
|
|
-----------
|
|
Like the 85xx CDS systems, the 8544 DS board has two flash banks.
|
|
They are both present on boot, but there locations can be swapped
|
|
using the dip-switch SW10, bit 2.
|
|
|
|
However, unlike the CDS systems, but similar to the 8641 HPCN
|
|
board, a runtime reset through the FPGA can also affect a swap
|
|
on the flash bank mappings for the next reset cycle.
|
|
|
|
Irrespective of the switch SW10[2], booting is always from the
|
|
boot bank at 0xfff8_0000.
|
|
|
|
|
|
Memory Map
|
|
----------
|
|
|
|
0xff80_0000 - 0xffbf_ffff Alternate bank 4MB
|
|
0xffc0_0000 - 0xffff_ffff Boot bank 4MB
|
|
|
|
0xffb8_0000 Alternate image start 512KB
|
|
0xfff8_0000 Boot image start 512KB
|
|
|
|
|
|
Flashing Images
|
|
---------------
|
|
|
|
For example, to place a new image in the alternate flash bank
|
|
and then reset with that new image temporarily, use this:
|
|
|
|
tftp 1000000 u-boot.bin.8544ds
|
|
erase ffb80000 ffbfffff
|
|
cp.b 1000000 ffb80000 80000
|
|
pixis_reset altbank
|
|
|
|
|
|
To overwrite the image in the boot flash bank:
|
|
|
|
tftp 1000000 u-boot.bin.8544ds
|
|
protect off all
|
|
erase fff80000 ffffffff
|
|
cp.b 1000000 fff80000 80000
|
|
|
|
Other example U-Boot image and flash manipulations examples
|
|
can be found in the README.mpc85xxcds file as well.
|
|
|
|
|
|
The pixis_reset command
|
|
-----------------------
|
|
A new command, "pixis_reset", is introduced to reset mpc8641hpcn board
|
|
using the FPGA sequencer. When the board restarts, it has the option
|
|
of using either the current or alternate flash bank as the boot
|
|
image, with or without the watchdog timer enabled, and finally with
|
|
or without frequency changes.
|
|
|
|
Usage is;
|
|
|
|
pixis_reset
|
|
pixis_reset altbank
|
|
pixis_reset altbank wd
|
|
pixis_reset altbank cf <SYSCLK freq> <COREPLL ratio> <MPXPLL ratio>
|
|
pixis_reset cf <SYSCLK freq> <COREPLL ratio> <MPXPLL ratio>
|
|
|
|
Examples;
|
|
|
|
/* reset to current bank, like "reset" command */
|
|
pixis_reset
|
|
|
|
/* reset board but use the to alternate flash bank */
|
|
pixis_reset altbank
|
|
|
|
/* reset board, use alternate flash bank with watchdog timer enabled*/
|
|
pixis_reset altbank wd
|
|
|
|
/* reset board to alternate bank with frequency changed.
|
|
* 40 is SYSCLK, 2.5 is COREPLL ratio, 10 is MPXPLL ratio
|
|
*/
|
|
pixis-reset altbank cf 40 2.5 10
|
|
|
|
Valid clock choices are in the 8641 Reference Manuals.
|
|
|
|
|
|
Using the Device Tree Source File
|
|
---------------------------------
|
|
To create the DTB (Device Tree Binary) image file,
|
|
use a command similar to this:
|
|
|
|
dtc -b 0 -f -I dts -O dtb mpc8544ds.dts > mpc8544ds.dtb
|
|
|
|
Likely, that .dts file will come from here;
|
|
|
|
linux-2.6/arch/powerpc/boot/dts/mpc8544ds.dts
|
|
|
|
After placing the DTB file in your TFTP disk area,
|
|
you can download that dtb file using a command like:
|
|
|
|
tftp 900000 mpc8544ds.dtb
|
|
|
|
Burn it to flash if you want.
|
|
|
|
|
|
Booting Linux
|
|
-------------
|
|
|
|
Place a linux uImage in the TFTP disk area too.
|
|
|
|
tftp 1000000 uImage.8544
|
|
tftp 900000 mpc8544ds.dtb
|
|
bootm 1000000 - 900000
|
|
|
|
Watch your ethact, netdev and bootargs U-Boot environment variables.
|
|
You may want to do something like this too:
|
|
|
|
setenv ethact eTSEC3
|
|
setenv netdev eth1
|