7681597e42
When compiling with all warnings enabled, some defines can lead to warning due to missing unsigned type suffix: warning: integer overflow in expression [-Woverflow] This fix should not affected behavior at all, since calculation with such overflows lead to the same actual address when writing to that location. However, it makes the warning disappear and also defines the right data type for a memory location.
49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
/*
|
|
* This file is part of the libopencm3 project.
|
|
*
|
|
* Copyright (C) 2010 Piotr Esden-Tempski <piotr@esden.net>
|
|
* Copyright (C) 2012 Michael Ossmann <mike@ossmann.com>
|
|
*
|
|
* This library is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Lesser General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This library 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 Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* along with this library. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <libopencm3/cm3/common.h>
|
|
|
|
extern unsigned _etext_ram, _text_ram, _etext_rom;
|
|
|
|
#define CREG_M4MEMMAP MMIO32((0x40043000U + 0x100))
|
|
|
|
static void pre_main(void)
|
|
{
|
|
volatile unsigned *src, *dest;
|
|
|
|
/* Copy the code from ROM to Real RAM (if enabled) */
|
|
if ((&_etext_ram-&_text_ram) > 0) {
|
|
src = &_etext_rom-(&_etext_ram-&_text_ram);
|
|
/* Change Shadow memory to ROM (for Debug Purpose in case Boot
|
|
* has not set correctly the M4MEMMAP because of debug)
|
|
*/
|
|
CREG_M4MEMMAP = (unsigned long)src;
|
|
|
|
for (dest = &_text_ram; dest < &_etext_ram; ) {
|
|
*dest++ = *src++;
|
|
}
|
|
|
|
/* Change Shadow memory to Real RAM */
|
|
CREG_M4MEMMAP = (unsigned long)&_text_ram;
|
|
|
|
/* Continue Execution in RAM */
|
|
}
|
|
}
|