Hi,
On Thu, Dec 20, 2012 at 12:21:36PM +0100, Hiroshi Doyu wrote:
> Felipe Balbi <balbi@xxxxxx> wrote @ Thu, 20 Dec 2012 11:06:25 +0100:
> ...
> > > @@ -149,7 +154,26 @@ done:
> > > */
> > > static void __init tegra_smp_init_cpus(void)
> > > {
> > > - unsigned int i, ncores = scu_get_core_count(scu_base);
> > > + unsigned int i, cpu_id, ncores;
> > > + u32 l2ctlr;
> > > + phys_addr_t pa;
> > > +
> > > + cpu_id = read_cpuid(CPUID_ID) & CPU_MASK;
> > > + switch (cpu_id) {
> > > + case CPU_CORTEX_A15:
> > > + asm("mrc p15, 1, %0, c9, c0, 2\n" : "=r" (l2ctlr));
> > > + ncores = ((l2ctlr >> 24) & 3) + 1;
> > > + break;
> > > + case CPU_CORTEX_A9:
> > > + /* Get SCU physical base */
> > > + asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (pa));
> > > + scu_base = IO_ADDRESS(pa);
> > > + ncores = scu_get_core_count(scu_base);
> > > + break;
> > > + default:
> > > + BUG();
> >
> > instead of bugging out, how about setting ncores to 1 instead ?
>
> Maybe that would be useful in the case of adding new ARM core in the
> future.
right, kernel would at least boot in that case.
--
balbi
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