source: src/router/services/tools/overclock_routerstation.c @ 11706

/*
 * overclock_routerstation.c
 *
 * Copyright (C) 2008 Sebastian Gottschall <gottschall@dd-wrt.com>
 *
 * This program is free software; 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 2
 * 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
 * MERCHANTABILITY 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; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * usage:
 * nvram set cpuclk=800
 * startservice overclock
 * 
 * valid cpuclk values are 680, 720, 800
 */
#include <unistd.h>
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <shutils.h>
#include <bcmnvram.h>


int overclock(FILE *out,char *freq,int value)
{
fseek(out,0xd3,SEEK_SET);
int val = getc(out);
if (val==value)
        {
        fprintf(stderr,"board already clocked to %sMhz\n",freq);
        return -1;
        }
fseek(out,0xd3,SEEK_SET);
putc(value,out);
return 0;
}

void start_overclock( void )    // hidden feature. must be called with
                                // "startservice overlock". then reboot the
                                // unit
{
    long len;
    long i;

    FILE *in = fopen( "/dev/mtdblock/0", "rb" );
    fseek(in,0,SEEK_END);
    len = ftell(in);
    rewind(in);
    fseek(in,0xc0,SEEK_SET);
    char check[8];
    char values[8]={0x24,0x08,0x00,0xaa,0x15,0x09,0x00,0x04};
    fread(check,1,8,in);
    if (memcmp(check,values,8))
        {
        fprintf(stderr,"no compatible routerstation bootloader found\n");
        fclose(in);
        return;
        }
    FILE *out = fopen( "/tmp/boot", "w+b" );
    rewind(in);
    for (i=0;i<len;i++)
        putc(getc(in),out);
    fclose(in);
    int ret=1;
    if (nvram_match("cpuclk","200"))
        ret=overclock(out,"200",0x1);
    if (nvram_match("cpuclk","300"))
        ret=overclock(out,"300",0x2);
    if (nvram_match("cpuclk","333"))
        ret=overclock(out,"333",0x3);
    if (nvram_match("cpuclk","400"))
        ret=overclock(out,"400",0x6);
    if (nvram_match("cpuclk","600"))
        ret=overclock(out,"600",0x7);
    if (nvram_match("cpuclk","680"))  //special ubiquiti setting with different ddram clock settings
        ret=overclock(out,"680",0xa); 
    if (nvram_match("cpuclk","720"))
        ret=overclock(out,"720",0x1e);
    if (nvram_match("cpuclk","800"))
        ret=overclock(out,"800",0x1f);
fclose(out);
if (!ret)
    {
    fprintf(stderr,"write new bootloader\n");
//    eval( "mtd", "-f", "write", "/tmp/boot", "RedBoot" );
    fprintf(stderr,"board now clocked to %sMhz\n",nvram_safe_get("cpuclk"));
    }
}


// int main (int argc, char *argv[]) { start_overclock (); }