This page is about "Darwinx86" in general. Nothing specific to Apple TV. Everything 100% APSL compliant.
- 1 About Darwin
- 2 Purpose of this page
- 3 Booting darwinx86-801.iso on a PC
- 3.1 Booting Darwin CD from IDE (works)
- 3.2 Booting Darwin CD from USB (works)
- 3.3 Booting Darwin CD into single user mode (works)
- 3.4 Trying to install Darwin to attached USB drive (fails)
- 3.5 Installing Darwin to attached IDE drive (works)
- 4 Installing Darwin on USB drive and boot generic PC from there
- 5 Minimal hardware requirements for darwinx86-801.iso
- 6 Minimal number of files to boot the Darwin kernel
- 7 Versions
We want to use this system. There are a couple of reasons why Darwin is great:
- It can read and write HFS+ Journaled natively
- Mac and Apple TV users are familiar with the workings of the system
- There is lots of Open Source applications available, including a graphical X desktop
- Can be used e.g., for embedded applications
- Can be legally changed and re-distributed in accordance with APSL
Initially, there was large interest in Darwin, but as time progressed, the community lost interest (due to reasons that shall not be evaluated here). However, with the switch of Mac OS to Intel, there seems to be a lot of interest of the community again, but mainly focused on Mac OS X rather than Darwin itself.
Mac OS Forge
Mac OS Forge, hosted by Apple, is where Kernel (xnu), Launchd, and other parts of Darwin live.
- #macosforge on irc.freenode.net
Unfortunately, this project closed due to a perceived "lack of interest" just when it became "interesting" due to the move to Intel.
- http://www.opendarwin.org/ (archived)
- #opendarwin on irc.freenode.net (however, their motto now is "Do not talk about OpenDarwin!")
Project was launched by bbraun, a former Apple employee who today insists that this project is dead.
Tries to build a complete desktop-oriented, general-purpose distribution on Darwin.
A collection of Open Source software for Darwin. It is claimed that they also host pre-compiled, ready-made binaries for Intel, however the URLs of those are hard to impossible to find on the site.
A collection of "ports files" which allow to build binaries from source. Although the primary OpenDarwin site will be closing down, this ports repository, darwinports.com, is separately hosted. James Berry recently wrote that the Ports project will live on.
- http://www.macports.org/ (However, there appear no readymade binaries to be hosted)
Is this superceded by MacPorts?
Describes itself as "the project previously known as DarwinPorts". Hosted by Apple, this seems to be actively developed (Google Summer of Code 2007).
Purpose of this page
The first goal will be to install Darwin on a USB drive and boot a generic PC from there. This serves as a starting point for further projects based on Darwin.
Please note that this page is about 100% legitimate uses of the Darwin Open Source system only.
Booting darwinx86-801.iso on a PC
Booting Darwin CD from IDE (works)
This is on a i915 chipset, DVD drive attached to IDE:
IOATAController device blocking bus AppleIntelPIIXPATA: ICH6 ATA/100 (CMD 0x1f0, CTR 0x3f4, IRQ 14 BM 0xffa0) Still waiting for root device Still waiting for root device Still waiting for root device
Changing the DVD drive jumper from cable select to Master solved this issue.
It boots up and asks where to install Darwin.
So in principle, darwinx86-801.iso contains a system that is capable of running on a generic PC.
Booting Darwin CD from USB (works)
The same darwinx86-801.iso also boots fine when the DVD drive is connected to the USB bus using a IDE2USB adapter.
So in fact darwinx86-801.iso contains a system that is capable of running on a generic PC from USB.
Can we turn this into a USB "bootstick"?
Booting Darwin CD into single user mode (works)
By default, the Darwin CD boots into a installer. However by using "-s" at the boot prompt, we can boot into "single user mode", which allows us to issue commands on the command line.
Trying to install Darwin to attached USB drive (fails)
Booting Darwin CD as described above, with plugged-in USB drive gives:
USBF: AppleUSBEHCI[0xc181b800]::Found a transaction past the completion deadline on bus 253, timing out! USBF: AppleUSBEHCI[0xc181b800]::Found a transaction past the completion deadline on bus 253, timing out! USBF: AppleUSBEHCI[0xc181b800]::Found a transaction which hasn't moved in 5 seconds on bus 253, timing out!
Installing Darwin to attached IDE drive (works)
As above, but this time the disk is on the IDE bus.
During installation, a lot of .root.tar.bz2 files are uncompressed.
So the installer doesn't actually clone the system that is used to boot the CD, but uses the compressed files. Are they different?
There is no apparent way to determine what gets installed. So We are getting a lot of stuff that is not necessary for a bare bones installation, such as gcc.
What is the minimum configuration of .root.tar.bz2 files necessary?
Updating mkext cache
Wouldn't this be done at next boot anyway?
- Installer asks for a root password
- Installer asks for a computer name (Bonjour hostname)
Installing Darwin on USB drive and boot generic PC from there
This is not working yet. Any help is greatly appreciated.
# Get Darwin 8.0.1 ISO for i386 from Apple # Boot it (see above). From booted Darwin, do: # Prepare USB stick by formatting it as HFS+ (Journaled) and enabling permissions # Copy /usr /bin /sbin /System /Library /private /cores /mach_kernel from ISO to USB drive # (maybe need to use the .root.tar.bz2 files instead, see above) # Bless USB stick and set partition active # Change Boot.plist # Boot USB stick
This easily fits on a 512 MB USB stick, and probably can be slimmed down further (e.g. for embedded applications).
This does boot, but as soon as the kernel is supposed to appear, it reboots the PC (even before printing a kernel panic).
Minimal hardware requirements for darwinx86-801.iso
Found out by experimentation. Please add.
SSE2 and SSE3 are NOT required since Darwin 8.0.1 ISO boots fine on a Celeron 400 MHz machine from 1999 with a PIIX4.
(However, this system requires "platform=X86PC" because it otherwise stalls with an ACPI error message.)
The Darwin installer puts 1.44 GB on disk. There is no apparent way to select less software in the installer. This is far more than what is needed for a minimal Darwin system.
Minimal number of files to boot the Darwin kernel
What are the minimum required files to boot the Darwin kernel and to bring up a minimal shell?
# Please collect here xnu-792.root.tar.bz2 # ...
- Darwin 8.0.1 = Mac OS X 10.4.x
- Darwin 7.0.1 = Mac OS X 10.3.x
- Darwin 6.0.2 = Mac OS X 10.2.x
- Darwin 1.4.1 = Mac OS X 10.1.x
- Darwin 1.3.1 = Mac OS X 10.0.x
- Darwin 1.2.1 = Mac OS X Public Beta
- Darwin 1.0.2 = Developer Preview 4