On 10/22/07, Ulf Samuelsson ulf@atmel.com wrote:
The environment variables should be stored in flash, not in SDRAM.
- Even if you execute from SDRAM.
What type of flash are you using. My stuff is there to support dataflash, and anything else get little or no testing.
I am using dataflash for everything. Everything is pretty equivalent to your code base, just the LCD timing values and the fb_base have changed.
Maybe I should rephrase. Everything seems fine once it is in dataflash. But if I `setenv bootcmd something' and then `saveenv`, it says "saving to dataflash...". `printenv` prints back the correct value (bootcmd=something), which I understand it isn't actually reloading from dataflash. If I then reset the board that bootcmd=something is gone. The environment variables are not in protected dataflash.
In board/at91sam9261ek/at91sam9261ek.c If I change gd->fb_base = (unsigned long) PHYS_SDRAM + 0x10000; back to gd->fb_base = (unsigned long) AT91C_IRAM; the LCD goes wonky but saving to dataflash works again.
The problem is that my framebuffer needs to be 384k, which is too big for the internal ram. Looking at what I just wrote it seems that maybe it is the writes to dataflash that are breaking, and not actually parts of the SDRAM getting corrupted.
Zac