Re: [Qemu-devel] [PATCH v10 4/5] arm: SoC model for Calxeda Highbank

[Mark Langsdorf]

On 01/18/2012 08:53 AM, Peter Maydell wrote:
> On 18 January 2012 14:35, Mark Langsdorf <address@hidden> 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.