[PATCH 04/17] bsp/arm: Add linker symbol bsp_processor_count

[Ralf Kirchner]

Hi Chris,
Yes using "enable SMP" sounds like a nice idea.
Actually beeing under time pressure I needed a solution which I could
get up and running quickly and easily. This is the major reason for the
linker command files solution.
I am sure the "enable SMP" solution also would be doable but it would
have cost me time I did not have.

Kind Regards
	Ralf Kirchner

Am 03.03.2014 22:43, schrieb Chris Johns:
> On 3/03/2014 8:25 pm, Ralf Kirchner wrote:
>> Hi Chris,
>> Actually there are two Altera Cyclone V BSP which are different only in
>> their linker commands file. One of the BSPs supports SMP and the other
>> one is a single core BSP.
>> The single core BSP came in handy during the development of not SMP
>> related BSP parts like the network driver.
> 
> I would have though this would be managed by the enable SMP option on
> the command line to RTEMS.
> 
>>
>> The SMP BSP uses linker commands file linkcmds.altcycv_devkit_smp and
>> defines bsp_processor_count to 2 in this linker commands file before
>> including linkcmds.altcycv_devkit.
>>
>> The single core BSP directly uses linker commands file
>> linkcmds.altcycv_devkit and leaves bsp_processor_count set to 1.
>>
>> Because bsp_processor_count gets defined in the linker commands file I
>> have added it to linker-symbols.h
>>
> 
> How portable are the linker command files ? They are specific to the GNU
> ld and sure we will be using it for the foreseeable future however we
> need to be mindful clang is moving fast and we should be ready.
> 
> I like linker command files and I have used and abused them in the past
> but I wonder if we need to be asking the question "Can this be
> implemented using standard language features that are portable ?", for
> example using a define controlled the RTEMS_SMP macro.
> 
> Chris


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