Re: cross-gcc for arm7tdmi-s with soft-float and thumb-interwork

[Yegor Yefremov <yegor_sub1 at visionsystems dot de>]

Christian Klippel wrote:
> dear crossgcc list people,
>
> after banging my head to the wall for some days now to get an arm-gcc 
> toolchain compiled, i finally gave up on trying my self and need to ask 
> people who have much more knowledge about these things ...
>
> the situation is as follows:
> so far i've been happily compiling code for an arm7tdmi-s based core using the 
> following toolchain: 
> http://opensrc.sec.samsung.com/download/arm-uclinux-tools-base-gcc3.4.0-20040713.sh
>
> the code works just fine, and it uses thumb-interworking since a few files are 
> copiled as thumb in my project (the code is at 
> svn://svn.mamalala.org/boop/trunk)
>
> but now i reached a point where i need some of the libc functions as well as 
> some basic math functions using soft-float, since the chip (an lpc2220) 
> doesnt have a fpu. unfortunately the above toolchain has no 
> thumb-interworking enabled in its libs, so i can not use it for that.
>
> the last two days i spent with the crosstool script from 
> http://kegel.com/crosstool/ but to no avail so far.
>
> probably i'm either too dumb to get a toolchain compiled correctly for my 
> needs, or i'm overlooking something obvious. so, i need some helping hand to 
> get myself such a toolchain compiled. much preferred is if someone could tell 
> me how to build one on linux-x86 instead of pointing me to a 
> readily-available toolchain, so i can learn from that (and eventually get the 
> same toolchain running on cygwin or mingw at some point)
>
> so, what i need is a way to build a toolchain that:
> a) targets the arm7tdmi-s chip with full 32 bit address-space
> b) uses soft-float only
> c) has thumb-interworking enabled, and
> d) runs on a x86 host, linux for a start is just perfect.
>
> it has to compile stand-alone code, i.e. the resulting code does not run under 
> a linux system, instead a binary file is produced out of the linked .elf 
> file, and then uploaded to the (external) flash. since some people in our 
> project are on windows it would be great if i could get the same toolchain 
> compiled on cygwin or mingw as well, to make them happy.
>
> is there any hope for me, or am i just lost on this one, and have to 
> reimplement all the needed functions myself (like sprintf, memcpy, etc...)?
>
> thanks for listening, and in the hope to find some answers,
>
> chris
>
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>   
Hi Chris,

I had also some trouble compiling the toolchain for ARM9 CPU. I found 
the solution by taking the croos-toolchain provided by Debian 
http://www.emdebian.org/tools/crosstools.html. So if it works for you, 
you can simply install VMWare Player (http://www.vmware.com/) and use 
your Debain distribution under Windows. Take a look at this project 
http://en.wikipedia.org/wiki/Xming for better integration of the VMWare 
in your WIndows environment. This are my researches on available toolchains:
http://www.yagarto.de/
http://www.siwawi.arubi.uni-kl.de/avr_projects/arm_projects/#winarm
http://www.codesourcery.com/
http://www.gnuarm.com/

Best regards,
Yegor Yefremov

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