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 _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
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. at91bootstrap fits into 4 kB of code, and a small amount of RAM, so it will run on real small CPUs.
You could try to do the same, instead of spending a lot of time, trying to optimize.