USB port not functional by default
According to Apple, the USB connector on the Apple TV is reserved for Apple support only. However, given that Command-S will boot it into single user mode it seems unlikely that they've disabled the port at the hardware level.
How to enable USB ports
Turbo claims "USB success". His procedure has been verified by lpp.
- USB Hubs
- Generic HID devices (USB game controllers)
USB port visible in the OS
The system_profiler included with the AppleTV sees the USB, and has a 1.1 and 2.0 driver attached. USB devices attached to the port are also seen by system_profiler:
USB: USB High-Speed Bus: Host Controller Location: Built In USB Host Controller Driver: AppleUSBEHCI PCI Device ID: 0x27cc PCI Revision ID: 0x0002 PCI Vendor ID: 0x8086 Bus Number: 0xfd USB Bus: Host Controller Location: Built In USB Host Controller Driver: AppleUSBUHCI PCI Device ID: 0x27c8 PCI Revision ID: 0x0002 PCI Vendor ID: 0x8086 Bus Number: 0x1d Bluetooth HCI: Version: 5.25 Bus Power (mA): 500 Speed: Up to 12 Mb/sec Product ID: 0x0001 Vendor ID: 0x0a12 IR Receiver: Version: 2.42 Bus Power (mA): 500 Speed: Up to 1.5 Mb/sec Manufacturer: Apple Computer, Inc. Product ID: 0x8241 Vendor ID: 0x05ac (Apple Computer, Inc.)
Mounting filesystems from USB Mass Storage Devices
Obviously this is the number one thing we'd like to get working with USB. I need to trace how diskarbitrationd works and how new USB storage devices get probed and mounted.
One possibility is that the diskarbitrationd distributed with the AppleTV is limited to mounting filesystems off the boot device of the unit, or the IDE interface. If someone with MacOS 10.4.7 could run 'md5 /usr/sbin/diskarbitrationd' and compare it to the appletv's:
MD5 (/usr/sbin/diskarbitrationd) = 493e88e3db210ef0557a2c48e1214a8b
we could begin to narrow things down.
Mac OS X 10.4.7 Comparisons
Mac OS 10.4.7, Intel Mac mini basic install. For more information see the discussion page.
$ md5 /Volumes/Bootcamp\ Master/usr/sbin/diskarbitrationd MD5 (/Volumes/Bootcamp Master/usr/sbin/diskarbitrationd) = ac17cc6c4d0e795b44fb1120f508c23a
Mac OS X 10.4.9
Then again, it seems as if the binary has somehow been modified again in the 10.4.9 update, as found on another Mac Mini Core Duo:
$ ls -aliFGo /usr/sbin/diskarbitrationd 532972 -r-xr-xr-x 1 root wheel - 235524 Jul 14 2006 /usr/sbin/diskarbitrationd* $ md5 /usr/sbin/diskarbitrationd MD5 (/usr/sbin/diskarbitrationd) = b20d8afa178da25285b311389ae0fe1f
Full /usr/bin/otool -L dump may be provided upon request
MD5 is unreliable with Mac OS X, because files changes when prebindings are update. Use ctool. It ignores the perbinding part of the file and then calculates a consistent MD5 checksum.
ctool doesn't work on diskarbitrationd:
$ ./ctool -d /usr/sbin/diskarbitrationd ====[ file: (/usr/sbin/diskarbitrationd) ]==== file type: unknown file: (/usr/sbin/diskarbitrationd) is not an object file. file size: (235524) bytes. MD5(/usr/sbin/diskarbitrationd)= b20d8afa178da25285b311389ae0fe1f $ file /usr/sbin/diskarbitrationd /usr/sbin/diskarbitrationd: Mach-O universal binary with 2 architectures /usr/sbin/diskarbitrationd (for architecture i386): Mach-O executable i386 /usr/sbin/diskarbitrationd (for architecture ppc): Mach-O executable ppc
Loading the KEXTs
IOUSBMassStorageClass.kext is required to support USB disks. This KEXT depends upon two other missing bundles IOSCSIArchitectureModelFamily.kext and IOStorageFamily.kext. However, IOSCSIArchitectureModelFamily.kext pulled from the 10.4.9 Combo Update fails to load with the following errors:
appletv:/System/Library/Extensions frontrow$ sudo kextload -v 6 IOSCSIArchitectureModelFamily.kext ... kextload: link/loading file /System/Library/Extensions/IOSCSIArchitectureModelFamily.kext/Contents/MacOS/IOSCSIArchitectureModelFamily kextload: allocated 90112 bytes in kernel space at 0x2bdc6000 kextload: using load address of 0x2bdc6000 kextload: kmod name: com.apple.iokit.IOSCSIArchitectureModelFamily kextload: kmod start @ 0x2bdd702a (offset 0x1034a) kextload: kmod stop @ 0x2bdd7067 (offset 0x10387) kextload: unable to register module with kernel kextload: a link/load error occured for kernel extension IOSCSIArchitectureModelFamily.kext kextload: clearing all version/dependency relationships among kernel extensions kextload: sending 1 personality to the kernel
IOSCSIArchitectureModelFamily.kext from the 10.4.7 and 10.4.8 updates fail with a similar error.
kextload: link/loading file /temp/10.4.7/IOSCSIArchitectureModelFamily.kext/Contents/MacOS/IOSCSIArchitectureModelFamily kextload: allocated 86016 bytes in kernel space at 0x2b66c000 kextload: using load address of 0x2b66c000 kextload: kmod name: com.apple.iokit.IOSCSIArchitectureModelFamily kextload: kmod start @ 0x2b67cbe0 (offset 0xff00) kextload: kmod stop @ 0x2b67cc20 (offset 0xff40) kextload: unable to register module with kernel kextload: a link/load error occured for kernel extension 10.4.7/IOSCSIArchitectureModelFamily.kext/ kextload: clearing all version/dependency relationships among kernel extensions kextload: sending 1 personality to the kernel
kextload: link/loading file /temp/10.4.8/IOSCSIArchitectureModelFamily.kext/Contents/MacOS/IOSCSIArchitectureModelFamily kextload: allocated 86016 bytes in kernel space at 0x2b5f9000 kextload: using load address of 0x2b5f9000 kextload: kmod name: com.apple.iokit.IOSCSIArchitectureModelFamily kextload: kmod start @ 0x2b609c8c (offset 0xffac) kextload: kmod stop @ 0x2b609cc9 (offset 0xffe9) kextload: unable to register module with kernel kextload: a link/load error occured for kernel extension 10.4.8/IOSCSIArchitectureModelFamily.kext/ kextload: clearing all version/dependency relationships among kernel extensions kextload: sending 1 personality to the kernel
Ozy used a cloned internal drive where he changed the boot picture in order to distinguish it from the internal drive. Since the Apple TV OS disables USB during the boot process, it doesn't fully boot. But hey, it's a start, isn't it? Next we'll make a Darwin mini USB drive image...
- Update 4/4/07: You need to patch the AppleFileSystemDriver.kext to get the system to fully boot. Details are available at the following page: Enable SSH Without Opening the Apple TV