[U-Boot] [PATCHv1 15/22] arm: socfpga: spl: add relocate_stack_to_sdram to lowlevel_init.S

[Dinh Nguyen <dinguyen@opensource.altera.com>]

On 01/15/2015 04:00 PM, Marek Vasut wrote:
> On Thursday, January 15, 2015 at 08:19:15 PM, Dinh Nguyen wrote:
>> Hi Marek,
> 
> Hi Dinh,
> 
>> On 01/14/2015 05:58 PM, Marek Vasut wrote:
>>> On Wednesday, January 14, 2015 at 05:40:55 PM,
>>> dinguyen at opensource.altera.com
>>>
>>> wrote:
>>>> From: Dinh Nguyen <dinguyen@opensource.altera.com>
>>>>
>>>> Add a function to relocate the stack from OCRAM to SDRAM.
>>>
>>> Hi,
>>>
>>> is this functionality really needed ? There's like 128 KiB of OCRAM on
>>> SoCFPGA,
>>
>> On cyclone5 and arria5, there is only 64KiB.
> 
> Ooops, sorry, my bad. You're right. But that is still boatload of memory,
> given that the SPL will use some hundreds of bytes for the stack under
> normal conditions.
> 
>>> which should be plenty, right? If moving the stack to SDRAM is really
>>> needed, then you might want to use the common stack relocation code (see
>>> relocate_code() function). Also, you should thoroughly describe the
>>> reason in the commit message, in this case it's really important.
>>
>> I'll update in v2.
> 
> So uh, what's the reason for moving the stack into the SDRAM anyway please ?
> 

I think this is needed to be able to support SPL_FAT_LOAD.

Dinh