Hello,
On my 8xx board standard reboot doesn't seem to reboot the system. It resets
the processor but it seems that
8xx is entering debug mode. So I wrote following function which I thought
could fix the problem. It
"seems" to be working, can someone verify if my 8xx reset function below is
correct?
My understanding is the following I need to clear bit CHSTPE, enable the
checkstop reset and cause
a intentional machine check...
{
int nr = 0;
ulong msr, der, addr;
/* Ref. Page 15-31, Page 37-46 */
#define SET_REGISTER( str, val ) \
({ unsigned long __value = (val); \
asm volatile( str : : "r" (__value)); \
__value; })
#define GET_REGISTER( str ) \
({ unsigned long __value; \
asm volatile( str : "=r" (__value) : ); \
__value; })
#define SET_DER(val) SET_REGISTER( "mtspr 149,%0", val )
#define GET_DER() GET_REGISTER( "mfspr %0,149" )
der = GET_DER();
SET_DER(der & ~0x20000000 ); /* CLEAR THE CHSTPE bit in DER
register */
immap->im_clkrst.car_plprcr |= 0x00000080; /* Checkstop Reset enable
*/
/* Interrupts and MMU off */
__asm__ volatile ("mtspr 81, 0");
__asm__ volatile ("mfmsr %0" : "=r"(msr));
msr &= ~0x1030;
__asm__ volatile ("mtmsr %0" :: "r"(msr) );
/*
* Trying to execute the next instruction at a non-existing address
* should cause a machine check, resulting in reset??
*/
addr = ~0x0;
((void (*)(void ))addr)();
return nr;
}
/Subodh Nijsure
Software Manager - Network Media Routers
SkyStream Networks
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