[U-Boot] BSS footprint of FAT very high - SPL issues

[Albert ARIBAUD]

Hi Aneesh,

Le 11/02/2011 07:28, Aneesh V a écrit :
> Hello Wolfgang, Albert,
>
> On Saturday 05 February 2011 12:28 PM, Albert ARIBAUD wrote:
>> Hi Aneesh,
>>
>> Le 03/02/2011 11:38, Aneesh V a écrit :
>>
>>> On second thoughts I would like to keep the entire bss in SDRAM. With
>>> MMC and FAT support, the SPL is already nearing the IRAM budget in
>>> OMAP3. It helps to save some space by moving out bss to SDRAM.
>>>
>>> If needed, I can fix up the start.S by defining something like
>>> _end_of_data. But is that really needed. I do not see any SPL that
>>> needs relocation and SDRAM bss at the same time.
>>
>> "Patches Welcome" :) -- with added thanks for patching all start.S /
>> u-boot.lds in the ARM arch consistently.
>
> I see __u_boot_cmd_end as the end of the image to be relocated in all
> the scripts. Shall I use this label for this purpose. This will work
> for now and save me from touching all those linker scripts. However,
> there is a small possibility of this leading to the same problem as
> with __bss_start in future. I don't think that should be a big concern.
> Do you agree?

As you point out, using __u_boot_cmd would cause as much of a concern as 
the current use of __bss_start, so I see no improvement there.

Please define a label in the linker file. If you haven't got time to 
port the change to other linkers, don't ; the BSS issue is, for now, 
specific to your case.

> Best regards,
> Aneesh

Amicalement,
-- 
Albert.