On 01/18/2012 08:53 AM, Peter Maydell wrote: > On 18 January 2012 14:35, Mark Langsdorf <mark.langsd...@calxeda.com> wrote: >> I can set the smp_loader code so that I can boot 2 cpus >> and verify their existence in /proc/cpuinfo, but I can't >> get 3 cpus to boot at all, no matter how I hack the existing >> arm_boot code. > > Right, multiple secondary cores requires multiple addresses > to be polled which we don't support in arm_boot.c at the moment.
How would multiple polling supposed to work? I've tried changing http://lxr.linux.no/#linux+v3.2.1/arch/arm/mach-highbank/highbank.c#L71 to point to a fixed address (0x50), and the boot loader still fails if there are 2 or more secondary CPUs. I've figured out that do_cpu_reset() is only called once, even though that seems a bit strange to me. I've tried the following in my local secondary_hook call: switch (info->nb_cpus) { case 4: stl_phys_notdirty(0x70, 0); case 3: stl_phys_notdirty(0x60, 0); case 2: stl_phys_notdirty(0x50, 0); env->regs[15] = 0x100; break; } which works fine with 2 cpus, but fails to boot both secondary cpus if there are 3 total cpus. --Mark Langsdorf Calxeda, Inc.
