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README

      1 Overview
      2 --------
      3 The MPC8544DS system is similar to the 85xx CDS systems such
      4 as the MPC8548CDS due to the similar E500 core.  However, it
      5 is placed on the same board as the 8641 HPCN system.
      6 
      7 
      8 Flash Banks
      9 -----------
     10 Like the 85xx CDS systems, the 8544 DS board has two flash banks.
     11 They are both present on boot, but there locations can be swapped
     12 using the dip-switch SW10, bit 2.
     13 
     14 However, unlike the CDS systems, but similar to the 8641 HPCN
     15 board, a runtime reset through the FPGA can also affect a swap
     16 on the flash bank mappings for the next reset cycle.
     17 
     18 Irrespective of the switch SW10[2], booting is always from the
     19 boot bank at 0xfff8_0000.
     20 
     21 
     22 Memory Map
     23 ----------
     24 
     25 0xff80_0000 - 0xffbf_ffff	Alternate bank		4MB
     26 0xffc0_0000 - 0xffff_ffff	Boot bank		4MB
     27 
     28 0xffb8_0000			Alternate image start	512KB
     29 0xfff8_0000			Boot image start	512KB
     30 
     31 
     32 Flashing Images
     33 ---------------
     34 
     35 For example, to place a new image in the alternate flash bank
     36 and then reset with that new image temporarily, use this:
     37 
     38     tftp 1000000 u-boot.bin.8544ds
     39     erase ffb80000 ffbfffff
     40     cp.b 1000000 ffb80000 80000
     41     pixis_reset altbank
     42 
     43 
     44 To overwrite the image in the boot flash bank:
     45 
     46     tftp 1000000 u-boot.bin.8544ds
     47     protect off all
     48     erase fff80000 ffffffff
     49     cp.b 1000000 fff80000 80000
     50 
     51 Other example U-Boot image and flash manipulations examples
     52 can be found in the README.mpc85xxcds file as well.
     53 
     54 
     55 The pixis_reset command
     56 -----------------------
     57 A new command, "pixis_reset", is introduced to reset mpc8641hpcn board
     58 using the FPGA sequencer.  When the board restarts, it has the option
     59 of using either the current or alternate flash bank as the boot
     60 image, with or without the watchdog timer enabled, and finally with
     61 or without frequency changes.
     62 
     63 Usage is;
     64 
     65 	pixis_reset
     66 	pixis_reset altbank
     67 	pixis_reset altbank wd
     68 	pixis_reset altbank cf <SYSCLK freq> <COREPLL ratio> <MPXPLL ratio>
     69 	pixis_reset cf <SYSCLK freq> <COREPLL ratio> <MPXPLL ratio>
     70 
     71 Examples;
     72 
     73 	/* reset to current bank, like "reset" command */
     74 	pixis_reset
     75 
     76 	/* reset board but use the to alternate flash bank */
     77 	pixis_reset altbank
     78 
     79 	/* reset board, use alternate flash bank with watchdog timer enabled*/
     80 	pixis_reset altbank wd
     81 
     82 	/* reset board to alternate bank with frequency changed.
     83 	 * 40 is SYSCLK, 2.5 is COREPLL ratio, 10 is MPXPLL ratio
     84 	 */
     85 	pixis-reset altbank cf 40 2.5 10
     86 
     87 Valid clock choices are in the 8641 Reference Manuals.
     88 
     89 
     90 Using the Device Tree Source File
     91 ---------------------------------
     92 To create the DTB (Device Tree Binary) image file,
     93 use a command similar to this:
     94 
     95     dtc -b 0 -f -I dts -O dtb mpc8544ds.dts > mpc8544ds.dtb
     96 
     97 Likely, that .dts file will come from here;
     98 
     99     linux-2.6/arch/powerpc/boot/dts/mpc8544ds.dts
    100 
    101 After placing the DTB file in your TFTP disk area,
    102 you can download that dtb file using a command like:
    103 
    104     tftp 900000 mpc8544ds.dtb
    105 
    106 Burn it to flash if you want.
    107 
    108 
    109 Booting Linux
    110 -------------
    111 
    112 Place a linux uImage in the TFTP disk area too.
    113 
    114     tftp 1000000 uImage.8544
    115     tftp 900000 mpc8544ds.dtb
    116     bootm 1000000 - 900000
    117 
    118 Watch your ethact, netdev and bootargs U-Boot environment variables.
    119 You may want to do something like this too:
    120 
    121     setenv ethact eTSEC3
    122     setenv netdev eth1
    123