Pandora

[Chuck Robey]

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Mark Tinguely wrote:
> The new Gumstix uses the Cortex OMAP processor as well.
> 
> I sent Oliver a link to the start of the ARMv6 UP/SMP cpu_throw/cpu_switch
> and atomic code that is backward compatible and tested on pre-ARMv6;
> obviously not yet on ARMv6.
> 
> In ARMv6 mode, the caches are not flushed on context change. ARMv6 UP
> and SMP have different caches: SMP does not use the pmap_fix_cache and
> the multiple KVA patch, and the ARMv6 UP and ARMv5 use a different
> definition of page sharing (ARMv6 uses page coloring), therefore the flushing
> circumstances change.
> 
> In the patch that I sent to him, there are still some flushes to be removed
> from pmap.c. We will see; maybe ARMv5, ARMv6 UP and SMP should use a
> different pmap.c file.

I guess when I wrote that last email, I had in mind that I was just writing a
set of crosstools.  I wasn't thinking about really doing FreeBSD for Pandora,
and I haven't got any excuse whatever for ignoring that great idea.

Look, I haven't got any experience in porting FreeBSD, so I'm probably going to
reel out a list of idiot questions.  Too Bad about that.  In beginning
FreeArmBSD, am I right that the first thing you need is a good ... hold that
thought, first real question is, this list, is this the place we use to discuss
all this?

If it's OK, then I was thinking that the first thing we need is a good set of
crosstools.  To do the crosstools, we need to have a central place that we can
put things, a public place so that folks can EASILY reference it, so that we
list the parameters of the crosstools, so that we are all of us using the same
kind of crosstools.

Am I right on this?  I'm willling to start from scratch on this, the first
binutils and gcc I've compiled is binutils-2.19 and gcc-4.3.1.  I've come to the
decision that the version of gcc I chose was probably wrong, I should have
chosen 4.3.3 instead.  I used the software description of arm-linux-gnueabi.  If
that is the triplet you'll agree on, then I'm going to rebuild it.  If I don't
have any other big problems with it, I'm going to see if I can get permission to
 put web pages up on freebsd.org, so we can have central agreement on the
software definition, and the versions of the tools we should rely on.  Do you
think I ought to post of a copy of my tools, or expect everyone to build their own?

I'm going after permission to create a web page.  I have no web tools here, and
damn near zero experience doing web pages.  I'll volunteer to do it, but if
anyone else wants to volunteer the work, you'd probably end up with a better job
being done.  Until someone else volunteers, I'll assume you want me to do it
(however badly) but the first person who tells me how bad I'm doing it, I'm
going to assume that person wants to volunteer themselves (I'll allow friendly
criticism, because I really am lousy at web stuff, and could use a few helpful
hints).

OK, waiting for comments how (I have more questions, but I'm waiting).

> 
> --Mark Tinguely

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