Re: [ECOS] How to build big-endian arm libraries for the Intel XScaleIXP425

[Jonathan Larmour <jifl at eCosCentric dot com>]

Krishna Ganugapati wrote:
>   a.. binutils-2.13.1-v850-hashtable.patch
>   b.. gcc-3.2.1-arm-multilib.patch   ------------> This should have been
> warning enough. Its 2004 - perhaps Gary's patch of May 2003  has already
> been folded appropriately into this  patch... (speculative)

IIRC that patch would conflict with the arm multilib one because they 
affect similar areas in the same file. Although if so I'd expect the 
toolchain build to fail.

Anyway, the "official" way to build is to download 
http://ecos.sourceware.org/gcc-3.2.1-arm-be.patch and apply that _after_ 
having applied gcc-3.2.1-arm-multilib.patch

>   c.. insight-5.3-tcl_win_encoding.patch
>  The tools took some amount of time to build, but built flawlessly. All my
> tools were stored in /gnutools on my machine.
>
> I then fired up the configtool - changed the build path to /gnutools from
> /opt/ecos/gnutools and surprise I saw the message "/gnutools does not appear
> to contain the build tools - use this folder anyway?"

Did you see if there was anything in there? Did the toolchain build 
definitely succeed?

> Questions:
>
> Am I right in assuming that gcc-3.2.1-arm-multilib.patch that is provided
> with the toolchain sources is a patch that generates all necessary binaries
> and libraries for all variants of  arm. More specifically, does this patch
> once applied force generation of binaries and libraries necessary for
> building a big-endian arm target for the Intel XScale IXP425?  If this is
> correct, my potential moral is now a real moral..

It doesn't include big-endian support.

> Can I therefore assume that my binaries were successfully built 

Nope. Look there and find out! In particular from the command line try 
running "/gnutools/tools/bin/arm-elf-gcc -print-multi-lib" to see if 
big-endian libraries are included.


> Could someone kindly explain to me why this message pops up - the toolchain
> is nicely installed in /gnutools - I point the "Build Path" to /gnutools -
> is there anything else I need to do?

It probably means there aren't tools there ;-).

> Could someone explain what gcc-3.2.1-arm-multilib.patch does? My reading of
> diff files is poor.

It allows the compiler to support various alternative configurations, or 
optimisations for certain configurations, specifically:

thumb
thumb interworking
arm9
strongarm
xscale

big-endian is another option, but is included in the separate patch above.

> Might I humbly suggest that the website be updated to indicate that ecos2.0
> toolchains do not provide the big-endian support for arm - presumably for
> size reasons and how to go about building a big-endian toolchain?

The big-endian patch isn't mentioned in the instructions for rebuilding 
tools, so I've added that.

Jifl
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