Sempron 64bit flags and kernel configuration

Message

qmic · Post by **qmic** » Wed Aug 24, 2005 12:50 pm

I`ve bought Sempron 64bit, but i cannot install system on it. I`ve got kernel panic or something like that. What architecture should i use? K8/Opteron/Athlon64 or generic x86_64. I`ve tried both but i`ve got same kernel panic.
Maybe it is fault of wrong CFLAGS?
I`m using -march athlon64 -O2 -pipe is it correct? I can`t find documentation to see what settings should i use for this processor. Please help. I`m trying to compile kernel for about 5 hours.

JinxterX · Post by **JinxterX** » Wed Aug 24, 2005 2:02 pm

I'd like help on this as well, I have a Sempron64 E6 core processor, what are the best compiler flags/kernel config for this?

qmic · Post by **qmic** » Wed Aug 24, 2005 2:52 pm

Can you send me your kernel config and your flags? I want to have working system, after it I will be thinking about best flags.

JinxterX · Post by **JinxterX** » Wed Aug 24, 2005 3:36 pm

I changed to this in my /etc/make.conf :

Code: Select all

CFLAGS="-O2 -march=athlon-xp -pipe -fomit-frame-pointer -msse2"

and the only two things I changed in my kernel config are :

Code: Select all

CONFIG_MK8=y
CONFIG_AGP_AMD64=y

I was previously using a stage3-athlon-xp-2005.0 install on a AthlonXP 1700+ and Nforce2 motherboard, all I did was swap in a Nforce3 board and Sempron64 then recompiled the kernel. I've had to recompile a few apps because things went a bit flakey but it seems stable just now.

qmic · Post by **qmic** » Wed Aug 24, 2005 3:43 pm

But why you don`t use march=k8 but march=athlon-xp???

nixnut · Post by **nixnut** » Wed Aug 24, 2005 3:54 pm

https://forums.gentoo.org/viewtopic-p-2 ... ml#2673329
https://forums.gentoo.org/viewtopic-p-2 ... ml#2673274

stop crossposting and start reading the forum guidlines.

12. Cross posting - Please do not post the same question to multiple forums. Cross posting clutters up the forums and makes things like searching harder for other users. If you feel your question could fit in multiple forums, please pick the best one and post there. If you would like your topic moved, message a Global Moderator. Also, please do not post about the same subject multiple times. One thread is sufficient. See Report violations, duplicates, misplaced posts, etc. if you like a thread moved.

JinxterX · Post by **JinxterX** » Wed Aug 24, 2005 4:18 pm

qmic wrote:But why you don`t use march=k8 but march=athlon-xp???

If I use march=k8 compilation fails.

chunderbunny · Post by **chunderbunny** » Wed Aug 24, 2005 7:05 pm

I'm fairly certain that Sempron processors aren't 64 bit, the newer ones are Athlon64 processors with the 64bit instructions turned off (as well as having less cache.) Unless AMD came out with a new range of Sempron processors recently which I'm not yet aware of you will have to use the old k7 or athlon-xp arch on a Sempron.

n0rbi666 · Post by **n0rbi666** » Wed Aug 24, 2005 7:37 pm

New semprons are 64bit and they have sse3.

Forezt · Post by **Forezt** » Fri Sep 16, 2005 12:02 am

Yes, but I seem to recall reading a tomshardware article that said that the Sempron64's have AMD's 64-bit extensions disabled, which is why they are so much cheaper and run so much cooler (namely, why I bought one). I'll be using the athlon-xp stage, since it's probably the closest to sempron64.

Debentoo_Gao · Post by **Debentoo_Gao** » Thu Oct 06, 2005 7:50 pm

Forezt wrote:Yes, but I seem to recall reading a tomshardware article that said that the Sempron64's have AMD's 64-bit extensions disabled, which is why they are so much cheaper and run so much cooler (namely, why I bought one). I'll be using the athlon-xp stage, since it's probably the closest to sempron64.

If u say so,but how can I installed the win xp x64 with my Sempron64.After reading so many topics,I still don't know how to set Sempron64's Kernel option & Gcc Option. (Just the two questions,don't tell me it's not a 64 bit processor,it is

)

yottabit · Post by **yottabit** » Sun Oct 09, 2005 6:01 am

There has been a new Sempron revision released that indeed *IS* 64-bit and supports AMD64. The only difference between the *NEW* revision Sempron and the Athlon64 is that the Sempron still has less cache.

I believe they're called revision E6 or something like that. There's a black AMD64 sticker on the lower-right of the retail box of the new revision Semprons.

I'm afraid that some dealers are going to be selling them as 64-bit when they aren't since most users with Windows would never know the difference... be careful out there. Insist on the retail packaging... as a bonus to buying the retail package you get a qualified heatsink+fan for the processor and a 3-yr warranty directly from AMD.

J

LordNikon9x · Post by **LordNikon9x** » Sun Oct 09, 2005 7:39 am

As I'm working on shop, where I build most our boxes, I can tell that some mobos do not detect that Sempron processor correctly and that may lead to some wierd problems. Motherboard BIOS update resolves some of those issues.

blondin · Post by **blondin** » Fri Oct 14, 2005 12:31 am

I've got a Sempron 64 bits and i had differents problem to install Gentoo.
So, i confirm that a motherboard bios update resolves some problems like "kernel panic", "segmentation fault" and boot problem ("no boot device found" a thing like this) at the installation. I did the update and i've got no problem to install gentoo now

hoyanf · Post by **hoyanf** » Thu Oct 27, 2005 8:37 pm

I have a Sempron64 2600+ n my cpuinfo :-
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 44
model name : AMD Sempron(tm) Processor 2600+
stepping : 2
cpu MHz : 1607.977
cache size : 128 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 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt lm 3dnowext 3dnow pni lahf_lm
bogomips : 3220.70

My Build info :-
CBUILD="i686-pc-linux-gnu"
CFLAGS="-O2 -march=k8 -mfpmath=sse -msse2 -mmmx -m3dnow -fomit-frame-pointer -falign-functions=4 -pipe"
CHOST="i686-pc-linux-gnu"

Just fyi...

Matteo Azzali · Post by **Matteo Azzali** » Wed Nov 02, 2005 5:48 pm

hoyanf wrote: My Build info :-
CBUILD="i686-pc-linux-gnu"
CFLAGS="-O2 -march=k8 -mfpmath=sse -msse2 -mmmx -m3dnow -fomit-frame-pointer -falign-functions=4 -pipe"
CHOST="i686-pc-linux-gnu"
Just fyi...

I suppose that -march=k8 CFLAG means you're on an AMD64 system.....Did u noticed any performance improvement doing so?
I know my 32-bit system is something like an hack..... (k8 support inside kernel) but's doin all
(alot compatible....)

hoyanf · Post by **hoyanf** » Wed Nov 02, 2005 6:08 pm

I'll try to provide come compile times... as i did the recompile earlier it was very fast indeed...

hoyanf · Post by **hoyanf** » Tue Nov 15, 2005 12:59 pm

my compile times on Sempron64 2600+

emerge system :-
real 154m5.294s
user 113m40.826s
sys 34m30.041s

emerge glibc binutils gcc portage
real 77m51.955s
user 59m27.491s
sys 16m50.567s

glibc emerge is with nptl enabled... its compiled twice for posix & nptl...

hope this is gud enuf...

Pancu · Post by **Pancu** » Wed Jan 04, 2006 1:21 pm

Hi!
I have a cpu Amd Sempron64 2600+.I read any topic but i don't find the solution.
Can you advise the Cflags for my Cpu??
I'm sorry but my english is very bad.
Thansk.

coco-loco · Post by **coco-loco** » Wed Jan 04, 2006 2:21 pm

You could use -march=athlon -mtune=athlon-xp -msse

krigav · Post by **krigav** » Wed Jan 04, 2006 2:38 pm

Here you can find a list of safe CFLAGS: http://gentoo-wiki.com/Safe_Cflags

I think for your AMD Sempron this Flags would be OK:

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CFLAGS="-march=athlon-xp -O2 -fomit-frame-pointer -pipe"
CXXFLAGS="${CFLAGS}"

HTH

nixnut · Post by **nixnut** » Wed Jan 04, 2006 6:48 pm

merged above three posts here.

kadu · Post by **kadu** » Wed Jan 04, 2006 8:32 pm

-march=athlon-xp is for 32-bit systems

sirdilznik · Post by **sirdilznik** » Thu Jan 05, 2006 5:30 am

Pancu wrote:Hi!
I have a cpu Amd Sempron64 2600+.I read any topic but i don't find the solution.
Can you advise the Cflags for my Cpu??
I'm sorry but my english is very bad.
Thansk.

If you're going to install a 64-bit system then:

Code: Select all

CFLAGS="-march=k8 -O2 -pipe -fno-ident"
CHOST="x86_64-pc-linux-gnu"
CXXFLAGS="${CFLAGS}"
MAKEOPTS="-j2"

Sempron 64bit flags and kernel configuration

Sempron 64bit flags and kernel configuration

qMic

hmm

Re: hmm

Problem Cflags for AMD Sempron64 2600+

Re: Problem Cflags for AMD Sempron64 2600+