[J-u-boot.git] / doc / README.mpc8544ds

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	Alernate 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
Commit	Line	Data
7bd30fc4 AF	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 Alernate 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
4ef35e53	101	After placing the DTB file in your TFTP disk area,
7bd30fc4 AF	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