103 lines
4.4 KiB
C
103 lines
4.4 KiB
C
/************************************************************************************
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* configs/sama5d3x-ek/src/sam_norflash.c
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*
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* Copyright (C) 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************************************/
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/************************************************************************************
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* Included Files
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************************************************************************************/
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#include <nuttx/config.h>
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#include <debug.h>
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#include "sama5d3x-ek.h"
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#ifdef CONFIG_SAMA5_BOOT_CS0FLASH
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/************************************************************************************
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* Definitions
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************************************************************************************/
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/************************************************************************************
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* Private Functions
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************************************************************************************/
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/************************************************************************************
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* Public Functions
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************************************************************************************/
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/****************************************************************************
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* Name: board_norflash_config
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*
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* Description:
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* If CONFIG_SAMA5_BOOT_CS0FLASH, then the system is boot directly off
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* CS0 NOR FLASH. In this case, we assume that we get here from the
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* primary boot loader under these conditions:
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*
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* "If BMS signal is tied to 0, BMS_BIT is read at 1. The ROM Code
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* allows execution of the code contained into the memory connected to
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* Chip Select 0 of the External Bus Interface.
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*
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* "To achieve that, the following sequence is preformed by the ROM
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* Code:
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*
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* - The main clock is the on-chip 12 MHz RC oscillator,
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* - The Static Memory Controller is configured with timing allowing
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* code execution inCS0 external memory at 12 MHz
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* - AXI matrix is configured to remap EBI CS0 address at 0x0
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* - 0x0 is loaded in the Program Counter register
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*
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* "The user software in the external memory must perform the next
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* operation in order to complete the clocks and SMC timings
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* configuration to run at a higher clock frequency:
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*
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* - Enable the 32768 Hz oscillator if best accuracy is needed
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* - Reprogram the SMC setup, cycle, hold, mode timing registers
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* for EBI CS0, to adapt them to the new clock
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* - Program the PMC (Main Oscillator Enable or Bypass mode)
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* - Program and Start the PLL
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* - Switch the system clock to the new value"
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*
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* This function provides the board-specific implementation of the logic
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* to reprogram the SMC.
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*
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****************************************************************************/
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void board_norflash_config(void)
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{
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#warning Missing logic
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}
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#endif /* CONFIG_SAMA5_BOOT_CS0FLASH */
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