OpenCores
URL https://opencores.org/ocsvn/s6soc/s6soc/trunk

Subversion Repositories s6soc

[/] [s6soc/] [trunk/] [sw/] [zipos/] [bootloader.c] - Blame information for rev 31

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 27 dgisselq
////////////////////////////////////////////////////////////////////////////////
2
//
3
// Filename:    bootloader.c
4
//
5
// Project:     CMod S6 System on a Chip, ZipCPU demonstration project
6
//
7
// Purpose:     To copy into RAM, upon boot, sections from the FLASH that
8
//              need to be placed into RAM.  This also handles setting initial
9
//              values.
10
//
11
// Creator:     Dan Gisselquist, Ph.D.
12
//              Gisselquist Technology, LLC
13
//
14
////////////////////////////////////////////////////////////////////////////////
15
//
16
// Copyright (C) 2015-2016, Gisselquist Technology, LLC
17
//
18
// This program is free software (firmware): you can redistribute it and/or
19
// modify it under the terms of  the GNU General Public License as published
20
// by the Free Software Foundation, either version 3 of the License, or (at
21
// your option) any later version.
22
//
23
// This program is distributed in the hope that it will be useful, but WITHOUT
24
// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
25
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
26
// for more details.
27
//
28
// You should have received a copy of the GNU General Public License along
29
// with this program.  (It's in the $(ROOT)/doc directory, run make with no
30
// target there if the PDF file isn't present.)  If not, see
31
// <http://www.gnu.org/licenses/> for a copy.
32
//
33
// License:     GPL, v3, as defined and found on www.gnu.org,
34
//              http://www.gnu.org/licenses/gpl.html
35
//
36
//
37
////////////////////////////////////////////////////////////////////////////////
38
//
39
//
40
#include "board.h"
41
 
42
// These values will be filled in by the linker.  They are unknown at compile
43
// time.
44
extern  int     load_image_start, load_image_end, bss_image_end;
45
 
46
void    bootloader(void) {
47
        int     len = ((int)&load_image_end) - RAMADDR;
48
        int     *flash = &load_image_start;
49
        int     *mem = (int *)RAMADDR;
50
 
51
        for(int i=0; i<len; i++)
52
                mem[i] = flash[i];
53
        // While I'd love to continue and clear to the end of memory, doing
54
        // so will corrupt my stack and perhaps even my return address.  Hence
55
        // we only do this much.
56
        for(int i=len; i< ((int)&bss_image_end)-RAMADDR; i++)
57
                mem[i] = 0;
58
}
59
 

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.