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

[Christian Klippel <ck at mamalala dot net>]

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

--
For unsubscribe information see http://sourceware.org/lists.html#faq