////////////////////////////////////////////////////////////////////////////////
|
////////////////////////////////////////////////////////////////////////////////
|
//
|
//
|
// Filename: bootloader.c
|
// Filename: bootloader.c
|
//
|
//
|
// Project: CMod S6 System on a Chip, ZipCPU demonstration project
|
// Project: CMod S6 System on a Chip, ZipCPU demonstration project
|
//
|
//
|
// Purpose: To copy into RAM, upon boot, sections from the FLASH that
|
// Purpose: To copy into RAM, upon boot, sections from the FLASH that
|
// need to be placed into RAM. This also handles setting initial
|
// need to be placed into RAM. This also handles setting initial
|
// values.
|
// values.
|
//
|
//
|
// Creator: Dan Gisselquist, Ph.D.
|
// Creator: Dan Gisselquist, Ph.D.
|
// Gisselquist Technology, LLC
|
// Gisselquist Technology, LLC
|
//
|
//
|
////////////////////////////////////////////////////////////////////////////////
|
////////////////////////////////////////////////////////////////////////////////
|
//
|
//
|
// Copyright (C) 2015-2016, Gisselquist Technology, LLC
|
// Copyright (C) 2015-2016, Gisselquist Technology, LLC
|
//
|
//
|
// This program is free software (firmware): you can redistribute it and/or
|
// This program is free software (firmware): you can redistribute it and/or
|
// modify it under the terms of the GNU General Public License as published
|
// modify it under the terms of the GNU General Public License as published
|
// by the Free Software Foundation, either version 3 of the License, or (at
|
// by the Free Software Foundation, either version 3 of the License, or (at
|
// your option) any later version.
|
// your option) any later version.
|
//
|
//
|
// This program is distributed in the hope that it will be useful, but WITHOUT
|
// This program is distributed in the hope that it will be useful, but WITHOUT
|
// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
|
// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
|
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
// for more details.
|
// for more details.
|
//
|
//
|
// You should have received a copy of the GNU General Public License along
|
// You should have received a copy of the GNU General Public License along
|
// with this program. (It's in the $(ROOT)/doc directory, run make with no
|
// with this program. (It's in the $(ROOT)/doc directory, run make with no
|
// target there if the PDF file isn't present.) If not, see
|
// target there if the PDF file isn't present.) If not, see
|
// <http://www.gnu.org/licenses/> for a copy.
|
// <http://www.gnu.org/licenses/> for a copy.
|
//
|
//
|
// License: GPL, v3, as defined and found on www.gnu.org,
|
// License: GPL, v3, as defined and found on www.gnu.org,
|
// http://www.gnu.org/licenses/gpl.html
|
// http://www.gnu.org/licenses/gpl.html
|
//
|
//
|
//
|
//
|
////////////////////////////////////////////////////////////////////////////////
|
////////////////////////////////////////////////////////////////////////////////
|
//
|
//
|
//
|
//
|
#include "board.h"
|
#include "board.h"
|
|
#include "bootloader.h"
|
|
|
// These values will be filled in by the linker. They are unknown at compile
|
// These values will be filled in by the linker. They are unknown at compile
|
// time.
|
// time.
|
extern int load_image_start, load_image_end, bss_image_end;
|
|
|
|
void bootloader(void) {
|
void _bootloader(void) __attribute__ ((section(".boot")));
|
int len = ((int)&load_image_end) - RAMADDR;
|
|
int *flash = &load_image_start;
|
void _bootloader(void) {
|
int *mem = (int *)RAMADDR;
|
int *flash = _kernel_image_start;
|
|
int *mem = _blkram;
|
|
|
|
while(mem < _kernel_image_end)
|
|
*mem++ = *flash++;
|
|
|
for(int i=0; i<len; i++)
|
|
mem[i] = flash[i];
|
|
// While I'd love to continue and clear to the end of memory, doing
|
// While I'd love to continue and clear to the end of memory, doing
|
// so will corrupt my stack and perhaps even my return address. Hence
|
// so will corrupt my stack and perhaps even my return address. Hence
|
// we only do this much.
|
// we only do this much.
|
for(int i=len; i< ((int)&bss_image_end)-RAMADDR; i++)
|
while(mem < _bss_image_end)
|
mem[i] = 0;
|
*mem++ = 0;
|
}
|
}
|
|
|
|
|