[ECOS] RAM Images on AT91SAM7s256

airdelroy aaron-nabble@planetrichardson.net
Wed Apr 2 01:48:00 GMT 2008


I am also trying to get a RAM image running on an AT91SAM7s256.  I ultimately
will run my applications from the flash, would like to debug in RAM. 
Currently I can load via sam-ba a rom image that will communicate over the
serial port, so I have this to start from.

Sam-ba I believe uses the first 8k of RAM.  So I think that the ldi file
should look like this:


MEMORY
{
    ram : ORIGIN = 0x00202000, LENGTH = 0xE000
}

SECTIONS
{
    SECTIONS_BEGIN
    SECTION_rom_vectors (ram, 0x00202000, LMA_EQ_VMA)
    SECTION_fixed_vectors (ram, 0x00200040, LMA_EQ_VMA)
    SECTION_text (ram, ALIGN (0x4), LMA_EQ_VMA)
    SECTION_fini (ram, ALIGN (0x4), LMA_EQ_VMA)
    SECTION_rodata (ram, ALIGN (0x4), LMA_EQ_VMA)
    SECTION_rodata1 (ram, ALIGN (0x4), LMA_EQ_VMA)
    SECTION_fixup (ram, ALIGN (0x4), LMA_EQ_VMA)
    SECTION_gcc_except_table (ram, ALIGN (0x4), LMA_EQ_VMA)
    SECTION_data (ram, ALIGN (0x4), LMA_EQ_VMA)
    SECTION_bss (ram, ALIGN (0x4), LMA_EQ_VMA)
    CYG_LABEL_DEFN(__heap1) = ALIGN (0x8);
    SECTIONS_END
}

Is the SECTION_fixed_vectors section correct?  Or should it be:
SECTION_fixed_vectors (ram, ALIGN (0x1), LMA_EQ_VMA) 

I think I found my version in some other arm variant...

Also should I modify these?
#define CYGMEM_REGION_ram (0x00200000)
#define CYGMEM_REGION_ram_SIZE (0x10000)

Now I need to modify startup code for vector memory remapping.  Where do I
find the RAM code that needs to be modified?

thanks,
Aaron
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