Dear Wolfgang,
On Tuesday 01 February 2011 01:25 PM, Wolfgang Denk wrote:
Dear Aneesh V,
In message4D4798E2.3050500@ti.com you wrote:
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?
Why would that be necessary? Just put the BSS segment in SDRAM, and everything is fine, isn't it?
SDRAM is initialized by the SPL. So, bss can not be initialized and used until SDRAM initialization is complete. I would prefer to have rest of the bss in internal RAM so that it's available as soon as we enter C code.
Also, I was wondering why we need 3 such scratch buffers in this implementation. I do not understand this code. But I was wondering if we could work with just one 64K buffer?
I have no idea. I am not familiar with that code either.
Probably I will give it a try once I solve some other issues I am facing in getting FAT to work.
Best regards, Aneesh