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Subject: Re: -mfpu=fpa

Re: -mfpu=fpa

From: Karl Kurbjun <kkurbjun_at_gmail.com>
Date: Mon, 12 Nov 2007 21:06:52 -0700

Cat,

Thanks to Dave's work on building ARM multilib you can use the
arm926ej-s option. If you recompile your arm gcc crosscompiler with
rockboxdev.sh it should give you full armv5 (arm926ej-s) support.
I'll commit a change to the configure script so that it adds the mcpu
option by default. I've been working with it for a day or so and it
seems to work well.

Regards,
Karl

On Nov 12, 2007 8:52 PM, Catalin Patulea <cat_at_vv.carleton.ca> wrote:
> Hey guys,
>
> I'm working on some code for the m:robe and I noticed that the current
> assembler for the m:robe target (arm9tdmi) doesn't support the BKPT
> instruction. I forget exactly what error message I get, but using
> "-mcpu=arm926ej-s" solved the problem (which makes sense, because
> that's a closer match to the CPU in the m:robe). I ended up getting a
> different error at that point, regarding heterogenous use of
> floating-point instructions. I found that compiling all of Rockbox
> with "-mfpu=fpa" solved that problem as well. The resulting code seems
> to run, though I haven't really tested much. I think the code size
> also decreased marginally.
>
> My question is: why do I need -mfpu=fpa and is it safe to check in a
> change like that? Does Rockbox use floating-point? I can dig up the
> actual error messages if you think they're valuable.
>
> -Cat
>
Received on 2007-11-13


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