[U-Boot] FSL DDR @ 83xx

[Andre Schwarz <andre.schwarz@matrix-vision.de>]

Kumar Gala schrieb:
>
> On Dec 9, 2008, at 12:01 PM, Andre Schwarz wrote:
>
>> Jon Loeliger schrieb:
>>> On Mon, 2008-12-08 at 18:02 +0100, Andre Schwarz wrote:
>>>
>>>> Kim,
>>>>
>>>> I'd like to change my DDR setup code since it looks like my computed
>>>> values are not perfectly stable on our 8343 based board.
>>>>
>>>> This implies using a fake SPD and the related code to set up the
>>>> controller.
>>>>
>>>> Is the "new" common FSL DDR setup code (cpu/mpc8xxx/ddr/*) stable for
>>>> 83xx or shall I stick to cpu/mpc83xx/spd_sdram.c for a while ?
>>>>
>>>
>>> The new, common DDR code in use by the FSL boards does not
>>> yet cover the 83xx family, though the plan is to eventually
>>> do so.
>>>
>>> Patches in that direction, are, naturally, welcome... :-)
>>>
>>> jdl
>>>
>>>
>>>
>> Is anybody working on this ?
>> The spd_sdram code lacks support for 3 bank adress bits and various
>> termination schemes which
>> are essential for tiny boards with soldered memory.
>>
>> Of course I could contribute for the 8343.
>> But I don't now about the "others" (85xx/86x) in detail and don't want
>> to scatter #ifdefs all over the code ...
>>
>> regards,
>> Andr?
>
> I don't believe anyone is currently working on getting the new ddr
> code to be used w/83xx.  Feel free to submit patches that does this
> and we will review them as they are posted.
>
> - k
After spending few hours it seems to work basically.
This is what I've done :

- add mpc8xxx(ddr/libddr.a to top level Makefile for 83xx
- created mpc83xx/ddr-gen2.c and ported to meet ddr83xx_t
- created board specific ddr.c for SPD accessor and basic setup.
- created board specific ddr2_spd_eeprom_t (soldered memory)

The board config got these #defines :

#define CONFIG_FSL_DDR2
#define CONFIG_DDR_SPD
#define CONFIG_NUM_DDR_CONTROLLERS      1           -> this should go
into mpc83xx header
#define CONFIG_DIMM_SLOTS_PER_CTLR      1
#define CONFIG_CHIP_SELECTS_PER_CTRL    1

Since spd_sdram.o is always build (mpc83xx/Makefile) and the code is
also activated by CONFIG_SPD_EEPROM
we should find a reasonable way  to switch between "old" and "new" DDR
code by some kind of #define.

Is this the way to go ?

regards,
Andr?

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