On 7/14/06, Ram <vshrirama@gmail.com> wrote:

Hi,
  Thanks for your response. I have gone much further and would like to know If

     ldr pc, _start_armboot
    _start_armboot:
        .word start_armboot

   Does this really invoke start_armboot?.  This is because
_start_armboot is what is
   stored in pc and not start_armboot and there is also a branch
point _start_armboot (underscore start_armboot) Please see above.

  Actually the above declares a variable start_armboot and does not
invoke the function
  start_armboot. If this is true, then who calls start_armboot?

   According to me start_armboot ( ) which is present in
lib_arm/board.c never returns until u reset the board and probably
should be one of the last functions that needs to be called.

   Correct?.

  Rest agreed, What i have understood is
        First,  reset is called which set the cpu to SVC32 mode and
calls cpu_init_crit
        which inturn calls lowlevel_init to setup memory and board
specific register values.

         Then stack is setup and start_amboot is called.

         start_armboot is the point of entry where code is C. ie
(Assembly to C) begins from start_armboot.

         am i Correct?.

       This is the function which does some remaining initialisation
and then starts initialising the for pheripherals.

    am i Correct?

I didnt understand the things relating interrupt and thier processing though.

Thanks and Regards,
sriram

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