On 4/12/12 12:38 PM, Nicolas Aguirre wrote:
Hi,
I'm building an oe-core minimal image and toolchain for the cubox[1]
which has a Marvell Armada 510 SoC, also known as Dove.
It's a armv7 Arm processor with wmmx2 instruction set [2].
I setup a new machine for the cubox and added :
require conf/machine/include/arm/arch-armv7a.inc
in my cubox.conf file
I also added
ARM_FP_MODE = "hardfp"
TARGET_FPU = "hardfp"
in my local.conf file.
That is not how to enable the mode with the newer tune infrastructure. You need
to simply enable a tune, in your machine configuration, that matches the desired
output.
The following are the defined VFP (hard float requires VFP) tunes for hard
float:
armv7ahf armv7athf armv7ahf-neon armv7athf-neon
the "t" varients support thumb, but don't have it enabled by default..
the -neon variants also enabled the neon instructions.
I do not know what the "wmmx2" instructions are, if they are different from VFP
and Neon, then it sounds like you need a custom tune.
Your machine configure should set DEFAULTTUNE = "..." where "..." is the tune
you want for that given machine. (armv7ahf should be a safe place to start.)
It finished the build sucessfully for angstrom efl-nodm-image.
I don't know exactly which option enable and where to add it to enable
hard floating point.
I see in meta-oe/meta/conf/machine/include/arm/arch-armv7a.inc
references to the armv7ahf architecture but without idea how to
activate it.
Btw is the 'a' after armv7 important for me ? As it seems that this
arm core is an armv7 and not armv7a. I dont find arch-armv7.inc file
in oe-core.
There was a recent commit that seemed to indicate that armv7 don't really exist,
and everything is an armv7a.... One of the ARM experts will have to help
clarify that point.
Another problem is, how to add support for wmmx2 instruction set ?
There is tune-iwmmxt.inc but it seems to refer to armv5 arch. There is
a way to enable this instruction set ?
Figure out the correct set of commands for gcc to support this processor, and I
can help you define a custom tune file.
The few references I found in a quick google search seem to indicate that the
core does support thumb, it should use the armv7-a compilation, and there is
little to no support for the wmmx2 instructions.
--Mark
Any help would be appreciate :)
[1] http://www.solid-run.com/products/cubox
[2] http://www.marvell.com/application-processors/armada-500/
regards,
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