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.
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.
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.
18 Irrespective of the switch SW10[2], booting is always from the
19 boot bank at 0xfff8_0000.
25 0xff80_0000 - 0xffbf_ffff Alernate bank 4MB
26 0xffc0_0000 - 0xffff_ffff Boot bank 4MB
28 0xffb8_0000 Alternate image start 512KB
29 0xfff8_0000 Boot image start 512KB
35 For example, to place a new image in the alternate flash bank
36 and then reset with that new image temporarily, use this:
38 tftp 1000000 u-boot.bin.8544ds
39 erase ffb80000 ffbfffff
40 cp.b 1000000 ffb80000 80000
44 To overwrite the image in the boot flash bank:
46 tftp 1000000 u-boot.bin.8544ds
48 erase fff80000 ffffffff
49 cp.b 1000000 fff80000 80000
51 Other example U-Boot image and flash manipulations examples
52 can be found in the README.mpc85xxcds file as well.
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.
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>
73 /* reset to current bank, like "reset" command */
76 /* reset board but use the to alternate flash bank */
79 /* reset board, use alternate flash bank with watchdog timer enabled*/
80 pixis_reset altbank wd
82 /* reset board to alternate bank with frequency changed.
83 * 40 is SYSCLK, 2.5 is COREPLL ratio, 10 is MPXPLL ratio
85 pixis-reset altbank cf 40 2.5 10
87 Valid clock choices are in the 8641 Reference Manuals.
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:
95 dtc -b 0 -f -I dts -O dtb mpc8544ds.dts > mpc8544ds.dtb
97 Likely, that .dts file will come from here;
99 linux-2.6/arch/powerpc/boot/dts/mpc8544ds.dts
101 After placing the DTB file in your TFTP disk area,
102 you can download that dtb file using a command like:
104 tftp 900000 mpc8544ds.dtb
106 Burn it to flash if you want.
112 Place a linux uImage in the TFTP disk area too.
114 tftp 1000000 uImage.8544
115 tftp 900000 mpc8544ds.dtb
116 bootm 1000000 - 900000
118 Watch your ethact, netdev and bootargs U-Boot environment variables.
119 You may want to do something like this too: