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