[Top] [All Lists]

Re: floating point on Nevada cpu

To: "Kevin D. Kissell" <>
Subject: Re: floating point on Nevada cpu
From: Steve Johnson <>
Date: Fri, 26 Jan 2001 06:01:12 -0700
Cc: Pete Popov <>,
Organization: Ridgerun, Inc.
References: <> <> <> <> <> <> <010601c08780$d0b8a7a0$0deca8c0@Ulysses>
"Kevin D. Kissell" wrote:

> I had essentially the same problem at MIPS a year or two ago,
> and I could have *sworn* that my fix, which ORed ST0_FR into
> the initial Status register value set in the startup assembly code,
> had made it into the standard distributions.  It's at about line 530
> of head.S, where a term is added to make the instruction
> li t1,~(ST0_CU1|ST0_CU2|ST0_CU3|ST0_KX|ST0_SX|ST0_FR)
> I spent days thinking it was a mipsel library problem,
> because it only turned up when I tried exercising a
> little-endian version of the same kernel that worked
> sell big-endian on the Indy.  But of course it was all
> due to the mipsel system having a boot-prom that
> cleverly enabled all the FP registers for me...
>             Kevin K.


    Your/Flo's/Ralf's thread in the MIPS Linux archives from last January was
what clued me into the ST0_FR setting in the first place.  Ralf gave arguments
why he wouldn't take your change at that time, which is why that line isn't in
the 2.4.x kernel.


Attachment: stevej.vcf
Description: Card for Steve Johnson

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