[En-Nut-Discussion] Ethernut3 Code in ROM and in RAM

[Paulo Silva]

Hi Martin

Take a look into .../nut/arch/arm/dev/at91_efc.c you will see the declaration "RAMFUNC int At91EfcCmd(u_int cmd, u_long tmo)" that puts the function to run in SRAM.If you want to learn a litle bit about what this happen look into ../nut/arch/init/crtat91sam7x256_rom.S, there you´ll see how is made the copy from rom to ram.

regards

Paulo
  ----- Original Message ----- 
  From: ml 
  To: en-nut-discussion at egnite.de 
  Sent: Saturday, September 08, 2007 7:19 AM
  Subject: [En-Nut-Discussion] Ethernut3 Code in ROM and in RAM



  Hello,

  does anyone know the easiest way to get some peaces of code running in RAM
  even if
  the main code is running in ROM ? (build with AT91_ROM.LD) because i must
  use the FLASH
  for storing data at runtime. 
  Or can i store a complete bin file as a part of my rom-code, transfer it
  completely to ram 
  and start it there ? (idea behind that is to attach a seriell or ftp
  bootloader  to every programm,
  so i´ve a selfcontaining, simple to use programming function)
  I had read many about the linker scripts and the startup assembler sequences
  but it is completly new
  to me and really hard stuff. i thought about using crurom for the latter.

  thank you for any hint.
  best regards 
  martin
    
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