Re: [PATCH] add basic SPARC support

[David Paterson <dnpaterson at gmail dot com>]

On Mon, Apr 4, 2011 at 5:43 PM, Yann E. MORIN
<yann.morin.1998@anciens.enib.fr> wrote:
> David, All,
>
> On Monday 04 April 2011 10:57:39 David Paterson wrote:
>
>> I'm putting together such a system at the moment, and have most of
>> it working now. ?The toolchain is pretty much done, and I just need some
>> tweaks to the BSP to finish it off :-)
>
> Maybe then you could forward your work here, and even coordonate with Sam
> on the Leon stuff. ;-)

Hi Yann, Sam, and all,

Of course I'll be glad to help with anything in that area, although I
don't think
I've done anything new or different - just followed the instructions
for building
a cross toolchain and BSP.

I didn't use Crosstool, or any other other build tools, but just went through
the manual process of building each GCC component.  I had some good help
on the gcc-help list, especially from Kai Ruottu who helped in me work out
the correct (-ish?) configuration options.

The BSP is mostly written from scratch, with references to some of the files
currently in the Libgloss tree.  A lot has been based on the GCC porting
guide ("Embed With GNU") plus reading info from people like Bill Gatliff,
Jeremy Bennet and others who seem to have done a lot of work in this
area.  Plus a fair bit of trial and error :-)

Since the hardware is "Leon with some extras" my crt0 has quite a lot of
additional code to handle this.  But the basics of it are pretty standard.

For Leon, I'm currently using GCC-4.5.2 built for sparc-elf, and selecting
-mcpu=v8, but plan to move up to 4.6 soon, as that has support for the
Leon processor, with correct tuning etc.

I'm pretty new to working with GCC, and learning as I go, but as I said, I'm
happy to share what I've learned over the past few months.  To be honest,
once I got over the initial learning hurdle, it's been fairly straightforward.

Cheers,

David P.

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