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Due to the Mac Pro 1,1 EFI being 32bit you will need to use a tool to remove the EFI functions from the installer.
This tool worked great for creating an ISO. Use the MBR bootloader during install. Be sure to install src and ports pkg.
There's a few things you have to configure to get it to work properly and there are still some small details you will need to configure.
Packages/src/ports (Security)
Change the word quarterly to latest in /etc/pkg/FreeBSD.conf
Then:
pkg update pkg upgrade freebsd-update fetch freebsd-update install portsnap fetch portsnap extract portsnap update
Intel ucode
pkg install devcpu-data
/boot/loader.conf cpu_microcode_load="YES" cpu_microcode_name="/boot/firmware/intel-ucode.bin"
Firewall
/etc/rc.conf pf_enable="YES" pf_rules="/etc/pf.conf"
/etc/pf.conf block in all pass out all keep state
Audio
The default audio needs to be enabled and the port output needs to be switched. This will change it to line out on the back.
/etc/sysctl.conf hw.snd.default_unit=3 dev.hdaa.0.config="ovref" dev.hdaa.0.gpio_config="0=set 1=set" dev.hdaa.0.nid21_config="as=4 seq=15"
/etc/rc.conf sndiod_enable="YES"
Video
I was able to get the video working by installing the old nVidia driver. The 304 release worked. “Nvidia GeForce 7300GT”
pkg install nvidia-driver-304
/etc/rc.conf linux_enable="YES" linux64_enable="YES" nvidia_load="YES" nvidia-modeset_load="yes" linux_load="YES"
/boot/loader.conf linux_enable="YES" linux64_enable="YES" nvidia_load="YES" nvidia-modeset_load="yes" linux_load="YES" agp_load="YES"
The video driver does act wonky in a tty though. It will flash green and pink with the text going garbled and I noticed the text is still very large. Changing your vt will resolve this issue.
/boot/loader.conf kern.vty=sc
Kernel
I get tons of kernel related errors. Apparently it has something to do with the smart battery. You can disable them.
/boot/loader.conf debug.acpi.disabled="smbat"
System Management Controller services are not enabled by default. You will need to compile a kernel with asmc support. You will need to learn how to build a kernel. and download this kernel patch and put it in /usr/src/sys/dev/asmc/
You want to make a copy (cp) of the GENERIC kernel config, for example, cp -r GENERIC MAC in /usr/src/sys/amd64/conf/ and then "make buildkernel KERNCONF=MAC" when compiling. Add the following lines to your kernel conf file. device coretemp device asmc device smb device smbus device smbios device cpuctl and add to /boot/loader.conf asmc_load="YES"
Time
The clock is horribly off.
tzsetup Select Yes. Scroll down to bottom and select UTC.
That should be about it.
The FreeBSD Foundation has a great tutorial on installing a working desktop environment as well.