linux-kernel - Re: powerpc 476, Little-endian, pte fault

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Date:	Tue, 01 Nov 2011 08:44:34 -0500
From:	Peter Bergner <bergner@...t.ibm.com>
To:	Santosh Kumar <santoshkumar.a@...il.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev@...abs.org, Michael Neuling <mikey@...ling.org>,
	Ian Munsie <ianmunsi@....ibm.com>, linux-kernel@...r.kernel.org
Subject: Re: powerpc 476, Little-endian, pte fault

On Tue, 2011-11-01 at 08:32 +0530, Santosh Kumar wrote:
> I am using the same compiler as 476 & 440 instruction is almost the same.

Well the 476 implements ISA 2.05, which I think has added a fair amount
over the 440.  Not to mention the 476 core that has been released has
a FP unit.  I'll note that GCC has support for a 476 with and without
a FP unit, even though AFAIK, we only ship one with a FP unit.
The relevant options are -mcpu=476 (no FP unit) and -mcpu=476fp
(with FP unit).  Basically, -mcpu=476 is equivalent to
-mcpu=476fp -msoft-float.



> @@ -53,7 +58,12 @@
>         mullw   r10,r0,r4       # and get the remainder
>         add     r8,r8,r0
>         subf    r6,r10,r6
> +#ifdef CONFIG_INVADER
>  4:     stw     r7,0(r3)        # return the quotient in *r3
>         stw     r8,4(r3)
> +#else
> +4:     stw     r7,0(r3)        # return the quotient in *r3
> +       stw     r8,4(r3)
> +#endif
>         mr      r3,r6           # return the remainder in r3
>         blr

This looks like a typo, since you didn't actually swap the offsets
on the stw's like you did in all of the other patch hunks.


Peter



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