Compile options (in /etc/make.conf) for a Via C3 processor

[CowMike]

I'm a Gentoo user for a few months now, and I have to say it's a wonderfull system

But now this: I just bought a new mobo/proc combo for my server: a Via Eden C3 800 mhz mobo/proc combo. I want to install Gentoo on it, but what are the best c-flags in /etc/make.conf ?

edit:
I mean of course the cflags, just like these:

[CowMike]

Hmm, someone knows this, right? Well, come on

[fillerbunny]

hi cowMike,

how are you getting on with gentoo and eden/c3?

I have just got one and am having problems installing.
I am trying with 1.1a iso and attempting "stage 3" install image.

I get the error "illegal instruction" when running "chroot"
not sure what to do.

[fillerbunny]

been digging around a bit on this...

in theory i686 should be correct for C3, but I have seen some
evidence that gcc will produce code that may not run on a C3
when using i686...

http://www.linux.ie/pipermail/ilug/2002-February/043054.html

it talks about a CMOV instruction that the C3 does not support,
but is optional in pentium pro/i686 instruction set. This is actually
listed in the "ommited features" section in the C3/ezra datasheet
on vias website. I've tried to look at the gcc documentation today
to see if this is something they are changing/ have changed, but
gcc.gnu.org is unavailable to me today for some reason.

reports suggest that using i586 instead will work. It might be worth
investigating additional use of 3dnow as well.

good luck, let me know how you get on.


[/url]

[CowMike]

[CowMike]

[fillerbunny]

I started again from stage1 and added -march=i586 to the conf file and it's all worked perfectly.

I am going to try it again adding 3dnow as well, since that is not part of i586.
I wonder if "K6" would work.

The C3 is 686 compatible, apart form the CMOV instruction, which is an optional part of 686, but gcc makes it non optional. There was talk on some gcc lists about making a C3 architecture option, but I don't see anything that made it in to the code.

now I am pondering on getting lm_sensor support for the 8231 southbridge. It would be good to monitor the chip temp, especially since there is no temp display in the bios.

[CowMike]

Ah, ok.

I always start at stage1 (it's fun ), so I have to do it too. Could you paste the relevant part of /etc/make.conf ? Thx!

[CowMike]

[fillerbunny]

here's the lines from /etc/make.conf

CHOST="i586-pc-linux-gnu"
CFLAGS="-march=i586 -O3 -pipe"
CXXFLAGS="-march=i586 -O3 -pipe"

[CowMike]

[CowMike]

[fillerbunny]

[CowMike]