Cflag for AMD GEODE NX 1750 cpu

[lanlane]

Hello,

I'm just preparing to install Gentoo on a new system. It runs with a AMD GEODE NX 1750 cpu.
Unfortunately the cpu isn't on http://gentoo-wiki.com/Safe_Cflags
Does anyone know safe Cflags for this cpu?
Thanks a lot!

L.

[think4urs11]

well, although searching for yourself at AMDs website shouldn't be to hard
(hint: http://www.amd.com/us-en/assets/content ... /32035.pdf)

those should be safe

CHOST="i686-pc-linux-gnu"
CFLAGS="-march=k8 -O2 -pipe -fomit-frame-pointer"
CXXFLAGS="${CFLAGS}"

[-Craig-]

-march=k8

Why??

The document you linked you says at the bottom of page 30 that k8 "causes it to generate high-performance code for the AMD Athlon 64 and AMD Opteron processors".
So why should you use that on a Geode?
And the document is titled "Compiler Usage Guidelines for 64-Bit Operating Systems on AMD64 Platforms".
The Geode is just 32-Bit.

I also own the model and use -march=athlon because the CPU is based on the athlon:

cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 6
model : 8
model name : AMD Athlon(tm) Prosowwor
stepping : 1
cpu MHz : 1396.207
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 mmx fxsr sse syscall mp mmxext 3dnowext 3dnow ts fid vid
bogomips : 2796.50

Am I wrong? Please correct me if so.

[slycordinator]

http://www.amd.com/us-en/ConnectivitySo ... 37,00.html

The NX processor family leverages Mobile AMD Athlon™ processor technology to deliver superior computing power for a variety of thin-client and other applications including point-of-sale terminals, kiosks, high-end printers and home media systems.

In other words: It's a low-power-consumption Athlon.

-march=athlon should work.

[bocacorazon]

Per the AMD website:

The AMD Geode NX processor family is ideally suited for applications that require an optimum combination of high-performance and low-power consumption. The NX processors are supported by extensive production infrastructure – built around a proven 7th-generation architecture – and a long-term supply commitment.

Notice the "7th-generation" bit. I believe that means Athlon socket A.

By the way, what do you think about the performance? Were you able to go fanless?
I still keep in one of my drawers the lifeless bodies of 7 Athlons or Durons that met their fate due to overheating (those clips on the socket A fans were HORRIBLE) so I'm a bit reluctant to go fanless myself. But I'm really tempted to buy one of these for my MythTV box.

[nixnut]

See http://gentoo-wiki.com/Safe_Cflags#Athl ... _.28AMD.29

[i92guboj]

The geode series are just Athlons, and like the rest of Athlons, they have exactly zero 64 bits capabilities So, -k7.

The gentoo wiki sugests this:

Code: Select all

CHOST="i686-pc-linux-gnu"
CFLAGS="-march=athlon-xp -O2 -pipe -fomit-frame-pointer"
CXXFLAGS="${CFLAGS}"

For the Geode NX, you can see it here: http://gentoo-wiki.com/Safe_Cflags#Athl ... _.28AMD.29

[-Craig-]

HELLO!
It's an Athlon. You better do NOT use -march=athlon-xp I think!

[i92guboj]

Leaving technical considerations appart, an Athlon-xp is the same than a Classic Athlon, just with SSE support. Wich the Geode NX series fully support. Earlier Geodes does not support it though.

Anyway, if there is any doubt, just look at /proc/cpuinfo, our friend has this info:

Code: Select all

cat /proc/cpuinfo 
 processor : 0 
 vendor_id : AuthenticAMD 
 cpu family : 6 
 model : 8 
 model name : AMD Athlon(tm) Prosowwor 
 stepping : 1 
 cpu MHz : 1396.207 
 cache size : 256 KB 
 fdiv_bug : no 
 hlt_bug : no 
 f00f_bug : no 
 coma_bug : no 
 fpu : yes 
 fpu_exception : yes 
 cpuid level : 1 
 wp : yes 
 flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 mmx fxsr sse syscall mp mmxext 3dnowext 3dnow ts fid vid 
 bogomips : 2796.50 

You can see that the sse flag is present, so, athlon-xp is fine. Just Athlon would also work. You could say -march=athlon -msse... I would be mostly the same.