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Apple's GCC on Mac OS X does not support the elf binary format. So compiling OpenBIOS on Mac OS X is not easy. Thankfully someone has already made a PowerPC cross compiler for Mac OS X that can compile OpenBIOS. Note: this tutorial was made with Mac OS 10.6. I suggest you use Mac OS 10.5 or higher when trying to build OpenBIOS.
Part 1: Installing the cross compiler on Mac OS X

1). Download the AWOS cross compiler: http://awos.wilcox-tech.com/downloads/AWOS-CC.bz2
2) Expand this bz2 file by double clicking on it.
3) Rename the file AWOS-CC to AWOS-CC.img.
4) Open the image file.
5) Open the 'AWOS Cross-Compiler for OS X' file on the newly mounted disk.
6) Select the 'PowerPC Support' and the 'i386 Support' check boxes when given the option.
7) Continue with the installation until it is finished.
8) Add the new compiler's folder to the PATH variable. This is the command you use if you are in the Bash shell:
export PATH=$PATH:/usr/local/ppcelfgcc/bin
export PATH=$PATH:/usr/local/i386elf/i386elf/bin
Note: the above step will probably need to be repeated with each new session of the shell you start. It can be made permanent by altering the .bash_profile file for the Bash shell. It is located in your home folder.
To open this file use these commands:
cd ~
open .bash_profile
Then simply paste the export commands in this file. Save changes when you are done.
To test to see if the cross compilers work issue these commands:
i386-elf-gcc --version
ppc-elf-gcc --version
You should see a message like this print:
ppc-elf-gcc (GCC) 4.2.3Copyright (C) 2007 Free Software Foundation, Inc.This is free software; see the source for copying conditions. There is NOwarranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
This should conclude installing the compiler.
Part 2: Building OpenBIOS from source code

1) Open the Terminal application.
2) Change the current directory to the inside of the openbios-devel folder.
3) Open the file makefile.target and add a # in front of this text 'CFLAGS+= -Werror'. Save the changes when done.
4) Type this command in the terminal and watch the show:
CROSS_COMPILE=ppc-elf- ./config/scripts/switch-arch ppc && make build-verbose
There is a known build issue when building on Mac OS 10.6. The switch-arch script will report your computer as 32 bit (x86) when it is really 64 bit (amd64). If you see the message 'panic: segmentation violation at …' while building, you probably have this problem.
If this happens to you, try setting the HOSTARCH variable before using the switch-arch script.
Example:
HOSTARCH=amd64 CROSS_COMPILE=ppc-elf- ./config/scripts/switch-arch ppc && make build-verbose
To test out your newly created binary in qemu, use the -bios option:
qemu-system-ppc -bios <path to binary>/openbios-qemu.elf.nostrip
This tutorial was made using information available on 12/21/2017. If you encounter any problems, please report it to the openbios developer list: openbios@openbios.org.

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