[ECOS] Redboot :: __startup_stack

Andrew Lunn andrew@lunn.ch
Fri Jul 1 07:46:00 GMT 2005


On Fri, Jul 01, 2005 at 10:09:49AM +0530, Harsha D wrote:
> Hi
>  
>  ===============================================================
>  Porting 		:	Redboot	
>  Platform	:	ARM922T based board
>  source base	:	based on Excalibur package
>  
>  ===============================================================
>  Memory layout is 
>  --------------------------
>  SRAM(32KB)	 0x00000000 - 0x00008000	
>  RAM(32MB)	 0x20000000 - 0x02000000
>  
>  ===============================================================
>  My ram ldi file
>  ---------------------
>  MEMORY
>  {
>      ram : ORIGIN = 0x20000000, LENGTH = 0x02000000
>  }
>  
>  SECTIONS
>  {
>      SECTIONS_BEGIN
>      SECTION_fixed_vectors (ram, 0x20000020, LMA_EQ_VMA)
>      SECTION_rom_vectors (ram, 0x20300000, 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
>  }

....
  
>  [ I am loading redboot at 0x20300000]
> Googling told me that 
>  fixed_vectors should be at 0x20(???) which is not the case for me.  
>  Will it cause any problems ?  If yes then how should i have my memory layout.

      SECTION_fixed_vectors (ram, 0x20000020, LMA_EQ_VMA)

Add an sram memory region and change this to 0x20 and the fixed
vectors will move.

        Andrew

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