Jeffrey Goldberg wrote:
[mailed, posted and bcc'ed to off list respondents]
First let me quote my original query:
I have one of these
CPU: VIA C3 Nehemiah (999.52-MHz 686-class CPU)
Origin = "CentaurHauls" Id = 0x691 Stepping = 1
Features=0x380b035<FPU,DE,TSC,MSR,MTRR,PGE,CMOV,MMX,FXSR,SSE>
http://www.via.com.tw/en/products/mainboards/motherboards.jsp?motherboard_id=81
And 6.2-RELEASE p2
When I set CPUTYPE=c3 in /etc/make.conf the world seemed to build just
fine, but (at least) gcc ended up broken. Most compiling attempts
after that ended up with gcc reporting an internal error.
Now that I've entered the FreeBSD world and am building everything
from source, I would like to take advantage of that by compiling for
my system.
Does anyone have a similar system? And what CPUTYPE or local tuning
do you recommend?
A dmesg for the system is available at
http://ntp0.goldmark.org/temp/dmesg
I've had two responses telling me that the make.conf defaults are just
fine, and two (one off list) recommending i686/pentiumpro. One for
pentiumpro and the other for i686, but as Andreas Rudish helpfully
pointed out, those two are probably the same thing. No one suggested
using c3. In fact, cpghost emphatically stated not to use C3 in make.conf
Adbullah Ibn Hamad Al-Marri also helpfully directed me for information
about safe CFLAGS to
http://gentoo-wiki.com/Safe_Cflags
where the entry for the Via Nehemiah says:
==============================================================
Nehemiah (C5XL)/C5P (Via)
CHOST="i686-pc-linux-gnu"
CFLAGS="-march=i686 -msse -mmmx -O2 -pipe -fomit-frame-pointer"
CXXFLAGS="${CFLAGS}"
note: The more recent versions of the C3 do support the cmov instruction
and hence -march=i686. If you must be compatible with all VIA C3
versions, do not use the settings in this section.
note: it is also possible to use "-march=c3-2". <-- Comment to this: I
got a problem "compiler can't create executables" with this setting.
note: I had much better luck with -Os than with -O2. The cache on the
nehemiah chips is really small, so making the executables small helps
more than anything else.
==============================================================
The off list response added
- Setting CPUTYPE to pentium, or pentiumpro both work fine. IIRC,
the C3 designation is Linux-specific and doesn't exist for
FreeBSD.
If everybody agrees that the c3 designation is unwise to use, then
probably the distributed
/usr/share/examples/etc/make.conf
The off list responded gave extremely helpful and detailed information
about trimming the kernel for a similar box. I've already done most of
what that recommends.
In sum, don't use the c3 specification in /etc/make.conf even though the
example would suggested otherwise.
Thanks all for your help
-j
Indeed. After reading a mock up of the processor is appears that it's an
Intel 686 clone. See:
<http://www.digit-life.com/articles2/roundupmobo/via-c3-nehemiah.html>
(it's a bit old for an article, so I hope you don't mind the dust :)..).
-Garrett
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