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Subject: Re: -mfpu=fpa

Re: -mfpu=fpa

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


Thanks to Dave's work on building ARM multilib you can use the
arm926ej-s option. If you recompile your arm gcc crosscompiler with 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.


On Nov 12, 2007 8:52 PM, Catalin Patulea <> 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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