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// #################################################################################################
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// #################################################################################################
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// # << NEORV32 - Bootloader >> #
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// # << NEORV32 - Bootloader >> #
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// # ********************************************************************************************* #
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// # ********************************************************************************************* #
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// # THE BOOTLOADER SHOULD BE COMPILED USING ONLY THE BASE ISA (rv32i or rv32e)! #
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// # In order to run the bootloader on any CPU configuration, the bootloader should be compiled #
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// # unsing the base ISA (rv32i/rv32e) only. #
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// # ********************************************************************************************* #
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// # ********************************************************************************************* #
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// # Boot from (internal) instruction memory, UART or SPI Flash. #
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// # Boot from (internal) instruction memory, UART or SPI Flash. #
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// # #
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// # #
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// # UART configuration: 8N1 at 19200 baud #
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// # UART configuration: 8 data bits, no parity bit, 1 stop bit, 19200 baud #
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// # Boot Flash: 8-bit SPI, 24-bit addresses (like Micron N25Q032A) @ neorv32.spi_csn_o(0) #
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// # Boot Flash: 8-bit SPI, 24-bit addresses (like Micron N25Q032A) @ neorv32.spi_csn_o(0) #
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// # neorv32.gpio_o(0) is used as high-active status LED (can be disabled via STATUS_LED_EN). #
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// # neorv32.gpio_o(0) is used as high-active status LED (can be disabled via #STATUS_LED_EN). #
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// # #
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// # #
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// # Auto boot sequence (can be disabled via AUTOBOOT_EN) after timeout (via AUTOBOOT_TIMEOUT): #
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// # Auto boot sequence (can be disabled via #AUTOBOOT_EN) after timeout (via #AUTOBOOT_TIMEOUT): #
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// # -> Try booting from SPI flash at spi_csn_o(0). #
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// # -> Try booting from SPI flash at spi_csn_o(0). #
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// # -> Permanently light up status led and freeze if SPI flash booting attempt fails. #
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// # -> Permanently light up status led and stall CPU if SPI flash booting attempt fails. #
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// # ********************************************************************************************* #
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// # ********************************************************************************************* #
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// # BSD 3-Clause License #
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// # BSD 3-Clause License #
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// # #
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// # #
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// # Copyright (c) 2020, Stephan Nolting. All rights reserved. #
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// # Copyright (c) 2020, Stephan Nolting. All rights reserved. #
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// # #
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// # #
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/**********************************************************************//**
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/**********************************************************************//**
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* @file bootloader.c
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* @file bootloader.c
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* @author Stephan Nolting
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* @author Stephan Nolting
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* @brief Default NEORV32 bootloader. Compile only for rv32i or rv32e (better).
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* @brief Default NEORV32 bootloader.
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**************************************************************************/
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**************************************************************************/
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// Libraries
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// Libraries
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#include <stdint.h>
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#include <stdint.h>
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#include <neorv32.h>
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#include <neorv32.h>
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* @name User configuration
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* @name User configuration
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**************************************************************************/
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**************************************************************************/
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/**@{*/
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/**@{*/
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/** UART BAUD rate */
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/** UART BAUD rate */
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#define BAUD_RATE (19200)
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#define BAUD_RATE (19200)
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/** Time until the auto-boot sequence starts (in seconds) */
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#define AUTOBOOT_TIMEOUT 8
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/** Enable auto-boot sequence if != 0 */
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/** Enable auto-boot sequence if != 0 */
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#define AUTOBOOT_EN (1)
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#define AUTOBOOT_EN (1)
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/** Time until the auto-boot sequence starts (in seconds) */
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#define AUTOBOOT_TIMEOUT 8
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/** Set to 0 to disable bootloader status LED */
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/** Set to 0 to disable bootloader status LED */
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#define STATUS_LED_EN (1)
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#define STATUS_LED_EN (1)
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/** Bootloader status LED at GPIO output port */
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/** Bootloader status LED at GPIO output port */
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#define STATUS_LED (0)
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#define STATUS_LED (0)
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/** SPI flash boot image base address */
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/** SPI flash boot image base address (warning! address might wrap-around!) */
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#define SPI_FLASH_BOOT_ADR (0x00800000)
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#define SPI_FLASH_BOOT_ADR (0x00800000)
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/** SPI flash chip select at spi_csn_o */
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/** SPI flash chip select line at spi_csn_o */
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#define SPI_FLASH_CS (0)
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#define SPI_FLASH_CS (0)
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/** Default SPI flash clock prescaler for serial peripheral interface */
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/** Default SPI flash clock prescaler */
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#define SPI_FLASH_CLK_PRSC (CLK_PRSC_8)
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#define SPI_FLASH_CLK_PRSC (CLK_PRSC_8)
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/** SPI flash sector size in bytes */
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/** SPI flash sector size in bytes (default = 64kb) */
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#define SPI_FLASH_SECTOR_SIZE (64*1024)
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#define SPI_FLASH_SECTOR_SIZE (64*1024)
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/**@}*/
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/**@}*/
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/**********************************************************************//**
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/**********************************************************************//**
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