Re: [microblaze-uclinux] Big endian contra Little endian

[Matthew Rubenstein <email@xxxxxxxxxxxx>]

	It seems to me that reversing the "endity" whenever it's needed is
exactly the kind of optimization in *gates* rather than microcode or
software that makes uCL/MB a better platform than a hard CPU. Why not
code a register retrieval opcode that checks a flag for which endity is
used in a given scope, compared to a flag of which endity is stored,
flags set by static #defines in the source code but executed at runtime?


On Thu, 2006-08-31 at 15:05 +0200, Antti Lukats wrote:
> With the MicroBlaze and EDK specially Xilinx has actually introduced a 3rd 
> endian, it is called
> 
> "wrongendian"
> 
> meaning that whatever you try first it will be wrong one.
> 
> all the endian stuff comes from IBM as Xilinx is using their bus models both 
> for ppc and microblaze
> 
> the endian stuff causes major headache with all kind of different drivers :(
> you only find it out when you are facing with some other thing that doesnt 
> work
> 
> another thing is the missing future of unaligned accesses, this could be 
> fixed by enabling the unaligned exception adding the exception handler and 
> recompiling the kernel with unalign support
> 
> Antti Lukats
> 
> 
> ----- Original Message ----- 
> From: "Roman Wojnar" <r.wojnar@xxxxxxxx>
> To: <microblaze-uclinux@xxxxxxxxxxxxxx>
> Sent: Thursday, August 31, 2006 2:17 PM
> Subject: RE: [microblaze-uclinux] Big endian contra Little endian
> 
> 
> >
> > Hi all,
> >
> > We find out that BIG ENDIAN used in microblaze is source of problems as 
> > some
> > drivers
> > and applications don't count with big endian but only widely used little
> > endian.
> >
> > 1. Could somebody explain me why it is necessary to use big endian od
> > Microblaze?
> > It is only question of memory model, which could be simply replaced?
> >
> > 2. Which of Linux system files are ENDIAN depended?
> >
> >
> > Roman Wojnar
> >
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> >
> > 
> 
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-- 

(C) Matthew Rubenstein

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