On Thu, Jan 17, 2008 at 01:40:54AM +0100, Thomas Bogendoerfer wrote:
> ----------------------------------------------------------------------
> void spin(void *a0)
> {
> while (1) {
> asm volatile(
> " .set mips3 \n"
> " sync \n"
> "1: ll $5, 0($4) \n"
> " sc $3, 0($4) \n"
> " beqz $3, 1b \n"
> " .word 0x7c03e83b \n" /* rdhwr */
> " lw $3, 0($4) \n"
> " nop \n"
> );
> }
> }
>
> int main()
> {
> int a;
>
> spin(&a);
> }
> ----------------------------------------------------------------------
>
> this kills my IP28 after a few seconds. If I drop rdhwr or sync the
> machine hasn't locked up after running for several minutes. Looks
> like we are hiting a strange condition.
SYNC on the R10000 will only graduate if the external signal SyncGblPerf
is asserted. A simple system could simply always set it. I wonder if
that has any affect. Logic analyzer time ...
Ralf
