[Top] [All Lists]


To: Jabir M <>
Subject: Re:
From: Manuel Lauss <>
Date: Fri, 11 Jun 2010 16:32:00 +0200
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed;; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=6p61P/1iRVDOurgFYBaPJ+gsvg+EixmgoMhkOa7sTyk=; b=fgRJL75mPjtgaA9Zj6LRyyW2pjGHjMcadAImIHRsxe4AHkO6JgPUEWnezC2ZZhRtXn HRNjjrPkSsbqff29NYNMnBywep+QZPWopOZrxMLAajZHbt42KNxiHIiDxVILbnybLZvQ /LuLZZRAvMyf+iXKsPQGjyW7yKj5cU4Z4pJgA=
Domainkey-signature: a=rsa-sha1; c=nofws;; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=bKc6I/CvEjNL9hEk2nzqQ25pxHFngxR3wm6SiYWnpoeFbo6pzb+7fSDrKdFF9TdbZm n+Cacyp1xi2Wb+fxCE3EPuGqp0lJ5/bujmlQlix9vdkPsG5lryXWPB9EduguFm1fnfEP IOi5W9VePoDZ38n0UF1z8P4cc6ZV912jgb6Ys=
In-reply-to: <>
References: <>

On Fri, Jun 11, 2010 at 4:06 PM, Jabir M <> wrote:
>    I am working on a FPU-less 34k MIPS platform with linux-2.6.24
> kernel. After running a Darwin media streaming server on the board
> for a while, my oprofile results shows high utilization on
> fpu_emulator_cop1Handler() & r4k_wait().
> wiki page says gcc will
> use hard float as default and soft float is best suited model for a
> fpu less processor.  Could anyone kindly help me in understanding use
> of -msoft-float .
> Whether I need to compile
> 1. kernel with -msoft-float ? or
> 2. Glibc ? or
> 3. Application ? or
> 4. All the above ?

I have fought with this in the past; what you need to do is:
- build gcc with softfloat support (mipsel-softfloat-linux-gnu triplet
for example),
- build a libc with this new compiler,
- then rebuild all libraries and apps with you new softfloat toolchain.

I have a working softfloat environment for MIPS32 here at [1], it includes a
complete c/c++ toolchain with gcc-4.4.3.   It's built for mips32r1, no idea if
it is supposed to work with 34k cores.

Best regards,
        Manuel Lauss


<Prev in Thread] Current Thread [Next in Thread>