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Building GCC

Here go some instructions for building an ARM cross compiler to build applications in C for the DCT 3 line of phones.

To be exact, it needs the following specs to achieve the best result for those platforms:

In this document I will assume a GCC version of 3.3.

Binutils

Version "binutils 2.14" was used, using this version (or higher) is recommended.

Changes
You need to make the following source changes before configuring and building:
ld/configure.tgt:
  • Change the beginning of the line starting with arm-*-elf to armeb-*-elf
ld/emulparams/armelf.sh:
  • Change the following line: 
    OUTPUT_FORMAT=bigarm
Build process
Change /opt/arm to your destination directory of choice. 
./configure --prefix=/opt/arm --target=armeb-elf \
            --program-prefix="armeb-elf-"
make
make install

GCC

Version "GCC 3.3" was used, using this version (or higher) is recommended. This needs binutils installed like described in the previous section.

gcc/config/arm/t-arm-elf:
  • uncomment the MULTILIB_* lines associated with mlittle-endian and mbig-endian
Build process
Change each occurence of /opt/arm to your destination directory of choice. 
export PATH="$PATH:/opt/arm/bin"
./configure --prefix=/opt/arm --target=armeb-elf \ 
            --program-prefix="armeb-elf-" -with-newlib -nfp \
            --enable-languages=c
make
make install

Usage

You should now have the entire GNU compiler chain for ARM Thumb Big Endian in the $prefix/bin directory. All utility names have "armeb-elf-" prefixed to them, for example "arm-eb-elf-gcc".

Compilation
armeb-elf-gcc -O2 -mthumb -mbig-endian (file).c -o (file).o
Linkage
armeb-elf-gcc -nodefaultlibs -nostartfiles \
              -Xlinker memmap \
              (objects) -o (outfile).elf
Stripping

The resulting executable needs to be stripped of its ELF headers before it can be used as flash image:

armeb-elf-objcopy -O binary (outfile).elf (outfile).bin

Last updated: 2005-02-21 14:19

This site is the result of a great deal of assembly code reading, research, countless (mostly futile) searches for data sheets, cross-referencing and analysing. If you use this information in any way please mention wumpus <blacksphere@goliath.darktech.org> (and others in the credits section) in the credits of your program/document. And tell me :) If you have more information please contribute. If you just copy this, stick your name on it and call it yours I hope you get your genitals bitten off by a three headed monkey. Have a nice day.

No mobile phones were harmed in the production of this site.