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[/] [s6soc/] [trunk/] [sw/] [zipos/] [bootloader.c] - Rev 44
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//////////////////////////////////////////////////////////////////////////////// // // Filename: bootloader.c // // Project: CMod S6 System on a Chip, ZipCPU demonstration project // // Purpose: To copy into RAM, upon boot, sections from the FLASH that // need to be placed into RAM. This also handles setting initial // values. // // Creator: Dan Gisselquist, Ph.D. // Gisselquist Technology, LLC // //////////////////////////////////////////////////////////////////////////////// // // Copyright (C) 2015-2016, Gisselquist Technology, LLC // // 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 // by the Free Software Foundation, either version 3 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 MERCHANTIBILITY 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. (It's in the $(ROOT)/doc directory, run make with no // target there if the PDF file isn't present.) If not, see // <http://www.gnu.org/licenses/> for a copy. // // License: GPL, v3, as defined and found on www.gnu.org, // http://www.gnu.org/licenses/gpl.html // // //////////////////////////////////////////////////////////////////////////////// // // #include "board.h" // These values will be filled in by the linker. They are unknown at compile // time. extern int load_image_start, load_image_end, bss_image_end; void bootloader(void) { int len = ((int)&load_image_end) - RAMADDR; int *flash = &load_image_start; int *mem = (int *)RAMADDR; 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 // so will corrupt my stack and perhaps even my return address. Hence // we only do this much. for(int i=len; i< ((int)&bss_image_end)-RAMADDR; i++) mem[i] = 0; }
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