/* * File: sdram.h * * This is an sdram initialization interface. The implemention of this * interface will interact with the particular SDRAM controller h/w chipset. * * Copyright (C) 2002 RidgeRun, Inc. * Author: RidgeRun, Inc  <skranz@ridgerun.com> * *  This program is free software; you can redistribute  it and/or modify it *  under  the terms of  the GNU General  Public License as published by the *  Free Software Foundation;  either version 2 of the  License, or (at your *  option) any later version. * *  THIS  SOFTWARE  IS  PROVIDED  ``AS  IS''  AND   ANY  EXPRESS  OR IMPLIED *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT,  INDIRECT, *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * *  You should have received a copy of the  GNU General Public License along *  with this program; if not, write  to the Free Software Foundation, Inc., *  675 Mass Ave, Cambridge, MA 02139, USA. * * Please report all bugs/problems to the author or <support@dsplinux.net> * * key: RRGPLCR (do not remove) * */#ifndef SDRAM_H#define SDRAM_H// -- Special Case --//  The system must provide a *.S file which implements a//  routine called "sdram_ini". This function must be implemented//  in assembly code and must not rely on the stack pointer. This//  routine is called prior to the system stack being setup which//  is why it cannot be implemented in "C". It is called very early//  in the boot from flash process. Specifically it is called from//  the head*.o object. Note: If the rrload image is downloaded to//  SDRAM using a jtag debugger, and run, then the head*.o logic//  is not run and execution starts at main() within the//  rrload_base.o object.////  Here is an example assembly implementation for reference://  //  +-------------------//  |  .text//  |  .align//  |  .global sdram_ini//  |  sdram_ini://  |    // Put your sdram initialization logic here,//  |    // and finish up by returning to the caller//  |    // like this...//  |    mov pc, lr//  +-------------------#endif