How can I debug the HiFive board by JTAG?

mwachs5 · July 25, 2017, 2:45pm

Hi Huangwanneng, suggest that you first take a look at the RISC-V Debug Spec:

And then you can look at the implementation of OpenOCD here:

In particular, when the program is loaded to the SPI Flash, GDB’s load command examines the ELF file, sees that it linked in the Flash region, then requests OpenOCD to uses the appropriate driver to program the SPI Flash. For Freedom E platforms, that’s the fespi driver that we’ve also added to OpenOCD. OpenOCD is causing the processor to execute little code snippets to program the SPI Flash.

github.com

riscv/riscv-openocd/blob/riscv/src/flash/nor/fespi.c

/***************************************************************************
 *   Copyright (C) 2010 by Antonio Borneo <borneo.antonio@gmail.com>       *
 *   Modified by Megan Wachs <megan@sifive.com> from the original stmsmi.c *
 *                                                                         *
 *   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 program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
 ***************************************************************************/

/* The Freedom E SPI controller is a SPI bus controller
 * specifically designed for SPI Flash Memories on Freedom E platforms.

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How can I debug the HiFive board by JTAG?

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