Re: [Qemu-devel] [Qemu-arm] [PATCH v1 3/3] raspi: Add "raspi3" machine type

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

On 02/15/2018 09:39 AM, Peter Maydell wrote:
> On 8 February 2018 at 05:50, Pekka Enberg <penberg@iki.fi> wrote:
>> This patch adds a "raspi3" machine type, which can now be selected as
>> the machine to run on by users via the "-M" command line option to QEMU.
>>
>> The machine type does *not* ignore memory transaction failures so we
>> likely need to add some dummy devices later when people run something
>> more complicated than what I'm using for testing.
>>
>> Signed-off-by: Pekka Enberg <penberg@iki.fi>
>> ---
>>  hw/arm/raspi.c | 21 +++++++++++++++++++++
>>  1 file changed, 21 insertions(+)
>>
>> diff --git a/hw/arm/raspi.c b/hw/arm/raspi.c
>> index 66fe10e376..048ff23a51 100644
>> --- a/hw/arm/raspi.c
>> +++ b/hw/arm/raspi.c
>> @@ -187,3 +187,24 @@ static void raspi2_machine_init(MachineClass *mc)
>>      mc->ignore_memory_transaction_failures = true;
>>  };
>>  DEFINE_MACHINE("raspi2", raspi2_machine_init)
>> +
>> +static void raspi3_init(MachineState *machine)
>> +{
>> +    raspi_init(machine, 3);
>> +}
>> +
>> +static void raspi3_machine_init(MachineClass *mc)
>> +{
>> +    mc->desc = "Raspberry Pi 3";
>> +    mc->init = raspi3_init;
>> +    mc->block_default_type = IF_SD;
>> +    mc->no_parallel = 1;
>> +    mc->no_floppy = 1;
>> +    mc->no_cdrom = 1;
>> +    mc->default_cpu_type = ARM_CPU_TYPE_NAME("cortex-a53");
>> +    mc->max_cpus = BCM2836_NCPUS;
>> +    mc->min_cpus = BCM2836_NCPUS;
>> +    mc->default_cpus = BCM2836_NCPUS;
>> +    mc->default_ram_size = 1024 * 1024 * 1024;
>> +}
>> +DEFINE_MACHINE("raspi3", raspi3_machine_init)
> 
> Hi. This patch breaks "make check", because it adds the raspi3
> to the arm-softmmu (32-bit guest CPUs only) build, where the
> cortex-a53 CPU doesn't exist:
> 
> e104462:xenial:qemu$ ./build/x86/arm-softmmu/qemu-system-arm -M raspi3
> **
> ERROR:/home/petmay01/linaro/qemu-from-laptop/qemu/qom/object.c:372:object_initialize_with_type:
> assertion failed: (type != NULL)
> Aborted (core dumped)
> 
> The usual way we avoid this is that 64-bit only boards are
> in their own source file, which is only compiled if the right
> CONFIG_FOO is set by default-configs/aarch64-softmmu.mak.
> In this case splitting the 64-bit board into its own source
> file would be weird and awkward, so the simple thing is to
> guard the raspi3 bits with #ifdef TARGET_AARCH64.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

> 
> (You might think we could define a CONFIG_RASPI3 in
> aarch64-softmmu.mak and #ifdef on it, but for some reason
> we don't expose those CONFIG_* to C code, possibly just because
> we've never needed to in the past...)
> 
> Since this was the only code change needed, I'm just going to make
> it and apply the patchset to target-arm.next, rather than ask
> you to do a respin. (There was also a stray space-at-end-of-line
> in patch 2 which checkpatch grumbles about; I'll fix that up too.)
> 
> thanks
> -- PMM
>