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

[Aneesh V]

Hi Ulf,

On Saturday 12 February 2011 02:46 AM, Ulf Samuelsson wrote:
> 2011-02-01 09:26, Aneesh V skrev:
>> Hi Vaibhav,
>>
>> On Tuesday 01 February 2011 12:22 PM, Bedia, Vaibhav wrote:
>>> Hi Aneesh,
>>>
>>> On Tuesday, February 01, 2011 10:54 AM, Aneesh V wrote:
>>>> Dear Wolfgang,
>>>>
>>>> I had been working on creating an MMC SPL for OMAP4. OMAP boards
>>>> typically support booting from the FAT partition of a removable
>>>> SD/MMC card. So, we need to have FAT support in the SPL. But I am
>>>> having some difficulties in adding FAT support to SPL.
>>>>
>>>> BSS footprint of fat.c is very high. It has three buffers each of
>>>> size 64KB. To workaround this problem I have done something like
>>>> below(The way x-loader works around this problem today).
>>>> CONFIG_SYS_SPL_FAT_BUFFER_BASE is in SDRAM.Is this ok?
>>>>
>>> [...]
>>>
>>> I guess you will hit a similar issue with the networking related code is used (I am not sure if SPL uses it). That also requires a decent size of bss.
>> Luckily we don't need networking related code in SPL.
>>
>> I would prefer to have rest of the BSS in internal RAM itself.
>>
>> best regards,
>> Aneesh
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> The way this problem is fixed on the AT91 is to run at91bootstrap first.
> This program will initialize the SDRAM and copy u-boot to SDRAM.

Thank you for the suggestion.

But please note that the SPL I am trying to create does exactly the
same. But the problem is that we allow users to keep the bootloaders
and kernel in the FAT partition of an MMC card(typically used for
development not on production systems). So, I have to support MMC and
FAT in SPL to load u-boot.

thanks,
Aneesh