Subject: Re: [PATCH v3 2/4] [POWERPC] 85xx: add board support for the TQM8548 modules

From: Wolfgang Grandegger <[email-masked]>
Date: Fri, 06 Jun 2008 09:36:47 +0200

Kumar Gala wrote:
> 
> On Jun 5, 2008, at 3:39 PM, Wolfgang Grandegger wrote:
> 
>> Kumar Gala wrote:
>>>
>>>> ===================================================================
>>>> --- /dev/null
>>>> +++ linux-2.6-galak/arch/powerpc/boot/dts/tqm8548.dts
>>>>
>>>
>>>> +    memory {
>>>> +        device_type = "memory";
>>>> +        reg = <0x00000000 0x20000000>;
>>>> +    };
>>>
>>> is memory fixed on this board to 256M?
>>
>> Ah, no, actually I have a module with 512 MB but it can be ordered with
>> less or more memory like the other TQM85xx modules as well. Does U-Boot
>> fixup this value? Is it used by Linux?
> 
> if u-boot determines the memory it will update this properly.  Linux
> expects this to be set to know how much mem is in the system.
> 
> if you can try setting the 2nd value to 0x0 and see if it boots that
> will let me know if its safe for me to change.

It works with

	memory {
		device_type = "memory";
		reg = <0x00000000 0x00000000>;	// size filled by U-Boot
	};

as well. With my previous definition Linux came up with 512 MB of memory
as well and it was already obvious, that U-Boot fills in the right size
value.

Wolfgang.