[ts-7000] wdt2 cuts in during reboot of TS-7260 (& fix)

["Clark" <>]

Nothing fancy here, but it works, and I hope it helps... 

We noticed that the reboot sequence would sometimes not reach its end, and a 
hard reset would occur, say while unmounting local file systems.  Obviously not 
ideal.  A standard UNIX technique here, just add a signal handler for the 
SIGTERM signal.  Then the handler physically turns off the hardware timer 
before exiting.  Source code:

/* wdt2.c, modified. */

#include <unistd.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <stdio.h>
#include <fcntl.h>
#include <assert.h>
#include <signal.h>

static volatile unsigned char *wdt_control;
static volatile unsigned char *wdt_feed;


static void
sig_hndlr( int signo )
{
    //Turn off wdt
    *wdt_feed=0x05;
    *wdt_control=0x00;
}

static int
registerSignalHandlers() 
{
  struct sigaction act;

 /* Install signal handler */
  act.sa_handler = sig_hndlr;
  sigemptyset(&act.sa_mask);
  act.sa_flags = 0;
  if( sigaction( SIGTERM, &act, NULL ) < 0 ) return 0;
  else return 1;
}

int main(void)
{

        int fd = open("/dev/mem", O_RDWR|O_SYNC);
        assert(fd != -1);

        wdt_control = (unsigned char 
*)mmap(0,getpagesize(),PROT_READ|PROT_WRITE,MAP_SHARED,fd,0x23800000);
        wdt_feed = (unsigned char 
*)mmap(0,getpagesize(),PROT_READ|PROT_WRITE,MAP_SHARED,fd,0x23C00000);

        if( !registerSignalHandlers() ) {
      fprintf( stderr, "Problem registering signal handler\n" ); 
    }   
        //printf("%d\n",*wdt_control);

        *wdt_feed=0x05;
        *wdt_control=0x07;

   //printf("%d\n",*wdt_control);
   
    while(1)
    {
      *wdt_feed=0x05;
       sleep(5);
    }

}



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