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List:       busybox
Subject:    Re: Build busybox for Microblaze
From:       Berend Dekens <busybox () cyberwizzard ! nl>
Date:       2011-06-17 12:48:56
Message-ID: 4DFB4D38.1040208 () cyberwizzard ! nl
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On 06/16/11 17:08, Dan Fandrich wrote:
> On Thu, Jun 16, 2011 at 02:50:47PM +0200, Berend Dekens wrote:
>> I am attempting to build busybox for a Microblaze system.
>>
>> While I have found old, prebuild busybox versions (giving me the
>> impression it should work, or worked in the past) my own attempts
>> have gotten me nowhere. I am using the Xilinx 12.2 GCC build chain
>> (which sets the __MICROBLAZE__ define).
>>
>> For example, the first issue I run into is that "byteswap.h" is
>> missing. When I modify "platform.h" to use the other headers if
>> __MICROBLAZE__ is set, I get the error that "features.h" could not be
>> found and so on.
>>
>> So is Microblaze no longer supported or is there some special way to
>> build busybox? The lack of documentation about busybox on this
>> platform is rather discouraging.
> You don't say what your target OS is or what libc you're using. Busybox
> is targetted at Linux with glibc or uClibc and that's what it's mostly
> tested on. The processor shouldn't matter (mostly) as long as as there's
> a gcc for it, which yours clearly has.  There is some support for other
> OSes and libcs, but you'll find that not all applets will compile.
>
Cheers for your answer.

When I started out, I tried to build glibc or uClibc for Microblaze but 
I didn't know if I could get busybox to compile without it ( it seems 
not ;-) ). While uClibc supports the Microblaze CPU, it does not support 
the Xilinx MMU (strange as the linux kernel does). In my system, the MMU 
is used so that a problem. As it seems impossible to build glibc or 
uClibc for Microblaze with MMU support, I reverted to a prebuild 
GCC+GLIBC from http://xilinx.wikidot.com/mb-gnu-tools .

Using this toolchain busybox compiled and ran fine.

Regards,
Berend Dekens
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