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RE: Big Endian au1550

To: 'Manish Lachwani' <mlachwani@mvista.com>, Prashant Viswanathan <vprashant@echelon.com>
Subject: RE: Big Endian au1550
From: Prashant Viswanathan <vprashant@echelon.com>
Date: Wed, 27 Apr 2005 20:44:32 -0700
Cc: linux-mips@linux-mips.org
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
> Prashant Viswanathan wrote:
> 
> >Is there a reason why the default configuration file doesn't support Big
> >Endian for the dbAu1550?
> >
> >Even if I edit .config to set the endianness to "BIG" it seems to change
> to
> >"Little Endian" every time a make is run.
> >
> >Thanks
> >Prashant
> >
> >
> >
> >
> In arch/mips/Kconfig,
> 
> config CPU_LITTLE_ENDIAN
>         bool "Generate little endian code"
>         default y if ACER_PICA_61 || CASIO_E55 || DDB5074 || DDB5476 ||
> DDB5477 || MACH_DECSTATION
> || IBM_WORKPAD || LASAT || MIPS_COBALT || MIPS_ITE8172 || MIPS_IVR ||
> SOC_AU1X00 || NEC_OSPREY || OLIVETTI_M700 || SNI_RM200_PCI ||
> VICTOR_MPC30X || ZAO_CAPCELLA
>         default n if MIPS_EV64120 || MIPS_EV96100 || MOMENCO_OCELOT ||
> MOMENCO_OCELOT_G || SGI_IP22 || SGI_IP27 || SGI_IP32 || TOSHIBA_JMR3927
>         help
>           Some MIPS machines can be configured for either little or big
> endian
>           byte order. These modes require different kernels. Say Y if your
>           machine is little endian, N if it's a big endian machine.
> 
> So, it appears that if you have SOC_AU1X00 set, it will always be
> configured little endian.

Is there a reason for this? 

Many months ago I was able to build a big-endian image and load it on my
dbAu1550 (also configured to be BE). I just decided to update and now I find
that it is almost as if it is not meant to be built BE.




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