Re: Big Endian au1550

[ppopov@embeddedalley.com]

Prashant Viswanathan wrote:

>>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? 
>  
>
It's the more common configuration.

>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.
>  
>
BE should be fine too.  We should fix this in Kconfig.

Pete