[U-Boot] u-boot spl with fat32 on arm

[Tom Rini]

On Tue, Jan 28, 2014 at 03:23:23PM +0100, Michal Simek wrote:

> Hi guys,
> 
> I do play a little bit with u-boot spl and I am curious
> about fat32 implementation. There is MAX_CLUSTSIZE which is 65k
> and there are 3 buffers in fat.c code
> do_fat_read_at_block
> get_contents_vfatname_block
> get_dentfromdir_block
> 
> All these 3 are placed to bss section.
> I have just 192k of memory for SPL that's why I tried 2 things
> 1. Place these 3 fat arrays to different memory which is working fine
> 2. Decrease MAX_CLUSTSIZE to any low value (I do use 8k).
> 
> Unfortunately if I decrease MAX_CLUSTSIZE and add them to bss section
> SPL doesn't work. If I add them to a different section in front of
> or behind bss everything is just fine.
> 
> That's why I have a question where can be the problem in this behaviour
> that keeping 8k MAX_CLUSTSIZE in bss section doesn't work
> and keeping 8k MAX_CLUSTSIZE out of bss section works.
> 
> bss relocation is not done in SPL.

To be clear, are you saying you cannot do this in your case?  We support
CONFIG_SPL_BSS_START_ADDR / CONFIG_SPL_BSS_MAX_SIZE which is how on TI
platforms for example we put BSS into DDR, as we've configured that
before needing BSS.

-- 
Tom
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