[OpenWrt-Devel] [PATCH 3/3] linux: add support of Synopsys ARC boards

[Alexey Brodkin]

Hi Jonas,

On Wed, 2015-09-02 at 10:32 +0200, Jonas Gorski wrote:
> On Thu, Aug 27, 2015 at 1:03 PM, Alexey Brodkin
> <Alexey.Brodkin at synopsys.com> wrote:
> > This patch introduces support of new boards with ARC cores.
> > 
> >  [1] Synopsys SDP board
> >      This is a new-generation development board from Synopsys that
> >      consists of base-board and CPU tile-board (which might have a real
> >      ASIC or FPGA with CPU image).
> >      It sports a lot of DesignWare peripherals like GMAC, USB, SPI, I2C
> >      etc and is intended to be used for early development of ARC-based
> >      products.
> > 
> >  [2] nSIM
> >      This is a virtual board implemented in Synopsys proprietary
> >      software simulator (even though available for free for open source
> >      community). This board has only serial port as a peripheral and so
> >      it is meant to be used for runtime testing which is especially
> >      useful during bring-up of new tools and platforms.
> >      What's also important ARC cores are very configurable so there're
> >      many variations of options like cache sizes, their line lengths,
> >      additional hardware blocks like multipliers, dividers etc. And this
> >      board could be used to make sure built software still runs on
> >      different HW configurations.
> > 
> > Note there's a prerequisite http://patchwork.ozlabs.org/patch/502081/

[snip]

> > diff --git a/target/linux/arc/axs10x/config-4.1 b/target/linux/arc/axs10x/config-4.1
> > new file mode 100644
> > index 0000000..2cd3471
> > --- /dev/null
> > +++ b/target/linux/arc/axs10x/config-4.1
> > @@ -0,0 +1,127 @@
> > +#
> > +# ARC Architecture Configuration
> > +#
> 
> Please run make kernel_{menu|old|def}config to make this configs
> contain only the differences to the generic config.

Hm... even though I see "kernel_menuconfig" and "kernel_oldconfig"
targets exist in OpenWRT I cannot fing "kernel_defconfig". So I'm not sure
if there's an automated way for creation of minimalistic defconfig that
takes into account all levels of higher-level configs.

And kernel's "make savedefconfig" won't help here as well because
lots of items will be stripped from defconfig and so OpenWRT on build will
ask user to decide if this and that option should be on or off.

I tried to create very minimal configs that still have all options covered
on oldconfig.

If there's a how-to or guide on hoe to prepare configs for OpenWRT target
I'll try to conform its requirements.

> Also please move
> all common options from both subtargets into a
> target/linux/arc/config-4.1.

Well indeed there're same options in both configs.
But please note nSIM and AXS10x are completely different boards.
And each of those boards may have different CPU.

This first set of patches only covers ARC legacy architecture (ARC 700).

But with 4.2 release of Linux kernel new gen ARC architecture (ARC HS38)
was introduced and once that patch set is accepted in OpenWRT I'll
send another patch that add support of new gen ARC CPUs.

My plan was to have following files structure:

target/linux/arc/axs10x/profiles/arc700.mk
                                /archs38.mk
                /nsim/profiles/arc700.mk
                              /archs38.mk

Is it acceptable or I need to modify it?

> > diff --git a/target/linux/arc/nsim/target.mk b/target/linux/arc/nsim/target.mk
> > new file mode 100644
> > index 0000000..a36d98b
> > --- /dev/null
> > +++ b/target/linux/arc/nsim/target.mk
> > @@ -0,0 +1,9 @@
> > +BOARDNAME:=nSIM
> > +
> > +define Target/Description
> > +       Simple nSIM simulator of ARC cores.
> > +       Its only peripheral is serial port.
> > +       Useful for simple smoke-testing.
> > +endef
> > +
> > +FEATURES += ramdisk
> > \ No newline at end of file
> 
> Please fix this ^ ;)

Ooops somehow slipped through the cracks.
Will definitely fix it.

-Alexey
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