Device Nodes

2008-10-18T20:14:26Z

Linuxdevguy: /* Interesting Character Devices */

The underlying unix OS that powers the iPhone has a number of device nodes.
These nodes can be read from or written to by the OS or applications.

A iPhone 3G 2.0.2 contains:

crw-rw-rw- 1 root wheel 21, 0 Aug 28 15:35 aes_0
crw------- 1 root wheel 23, 0 Aug 28 18:56 bpf0
crw------- 1 root wheel 23, 1 Aug 28 18:56 bpf1
crw------- 1 root wheel 23, 2 Aug 28 15:35 bpf2
crw------- 1 root wheel 23, 3 Aug 28 15:35 bpf3
c------r-- 1 root wheel 11, 0 Aug 28 15:35 btreset
crw--w--w- 1 root wheel 0, 0 Aug 28 15:35 console
crw-rw-rw- 1 root wheel 1, 5 Aug 28 18:56 cu.bluetooth
crw-rw-rw- 1 root wheel 1, 7 Aug 28 15:35 cu.debug
crw-rw-rw- 1 root wheel 1, 1 Aug 28 15:35 cu.iap
crw-rw-rw- 1 root wheel 1, 3 Aug 28 15:35 cu.umts
brw-r----- 1 root operator 14, 0 Aug 28 15:35 disk0
brw-r----- 1 root operator 14, 1 Aug 28 15:35 disk0s1
brw-r----- 1 root operator 14, 2 Aug 28 15:35 disk0s2
crw------- 1 root wheel 9, 0 Aug 28 15:35 dlci.spi-baseband.0
crw------- 1 root wheel 9, 1 Aug 28 18:56 dlci.spi-baseband.1
crw------- 1 root wheel 9, 10 Aug 28 15:35 dlci.spi-baseband.10
crw------- 1 root wheel 9, 11 Aug 28 15:35 dlci.spi-baseband.11
crw------- 1 root wheel 9, 12 Aug 28 15:35 dlci.spi-baseband.12
crw------- 1 root wheel 9, 13 Aug 28 15:35 dlci.spi-baseband.13
crw------- 1 root wheel 9, 14 Aug 28 15:35 dlci.spi-baseband.14
crw------- 1 root wheel 9, 15 Aug 28 15:35 dlci.spi-baseband.15
crw------- 1 root wheel 9, 2 Aug 28 19:13 dlci.spi-baseband.2
crw------- 1 root wheel 9, 3 Aug 28 18:56 dlci.spi-baseband.3
crw------- 1 root wheel 9, 4 Aug 28 18:56 dlci.spi-baseband.4
crw------- 1 root wheel 9, 5 Aug 28 18:56 dlci.spi-baseband.5
crw------- 1 root wheel 9, 6 Aug 28 18:56 dlci.spi-baseband.6
crw------- 1 root wheel 9, 7 Aug 28 18:56 dlci.spi-baseband.7
crw------- 1 root wheel 9, 8 Aug 28 18:56 dlci.spi-baseband.8
crw------- 1 root wheel 9, 9 Aug 28 18:56 dlci.spi-baseband.9
crw------- 1 root wheel 6, 0 Aug 28 15:35 klog
cr--r--r-- 1 root wheel 13, 3 Aug 28 15:35 mrvl868x0
crw------- 1 root wheel 9, 0 Aug 28 15:35 mux.spi-baseband
crw-rw-rw- 1 root wheel 3, 2 Aug 28 18:56 null
crw-rw-rw- 1 root tty 15, 1 Aug 28 19:13 ptmx
crw-rw-rw- 1 root wheel 5, 0 Aug 28 15:35 ptyp0
crw-rw-rw- 1 root wheel 5, 1 Aug 28 15:35 ptyp1
crw-rw-rw- 1 root wheel 5, 2 Aug 28 15:35 ptyp2
crw-rw-rw- 1 root wheel 5, 3 Aug 28 15:35 ptyp3
crw-rw-rw- 1 root wheel 5, 4 Aug 28 15:35 ptyp4
crw-rw-rw- 1 root wheel 5, 5 Aug 28 15:35 ptyp5
crw-rw-rw- 1 root wheel 5, 6 Aug 28 15:35 ptyp6
crw-rw-rw- 1 root wheel 5, 7 Aug 28 15:35 ptyp7
crw-rw-rw- 1 root wheel 8, 0 Aug 28 15:35 random
crw-r----- 1 root operator 14, 0 Aug 28 15:35 rdisk0
crw-r----- 1 root operator 14, 1 Aug 28 15:35 rdisk0s1
crw-r----- 1 root operator 14, 2 Aug 28 15:35 rdisk0s2
crw-rw-rw- 1 root wheel 20, 0 Aug 28 15:35 sha1_0
crw-rw-rw- 1 root wheel 2, 0 Aug 28 15:35 tty
crw-rw-rw- 1 root wheel 1, 4 Aug 28 15:35 tty.bluetooth
crw-rw-rw- 1 root wheel 1, 6 Aug 28 15:35 tty.debug
crw-rw-rw- 1 root wheel 1, 0 Aug 28 15:35 tty.iap
crw-rw-rw- 1 root wheel 1, 2 Aug 28 15:35 tty.umts
crw-rw-rw- 1 root wheel 4, 0 Aug 28 15:35 ttyp0
crw-rw-rw- 1 root wheel 4, 1 Aug 28 15:35 ttyp1
crw-rw-rw- 1 root wheel 4, 2 Aug 28 15:35 ttyp2
crw-rw-rw- 1 root wheel 4, 3 Aug 28 15:35 ttyp3
crw-rw-rw- 1 root wheel 4, 4 Aug 28 15:35 ttyp4
crw-rw-rw- 1 root wheel 4, 5 Aug 28 15:35 ttyp5
crw-rw-rw- 1 root wheel 4, 6 Aug 28 15:35 ttyp6
crw-rw-rw- 1 root wheel 4, 7 Aug 28 15:35 ttyp7
crw--w---- 1 root tty 16, 0 Aug 28 19:13 ttys000
crw-rw-rw- 1 root wheel 10, 2 Aug 28 15:35 uart.bluetooth
crw-rw-rw- 1 root wheel 10, 3 Aug 28 15:35 uart.debug
crw-rw-rw- 1 root wheel 10, 0 Aug 28 15:35 uart.iap
crw-rw-rw- 1 root wheel 10, 1 Aug 28 15:35 uart.umts
crw-rw-rw- 1 root wheel 8, 1 Aug 28 15:35 urandom
brw------- 1 root operator 1, 0 Aug 28 15:35 vn0
brw------- 1 root operator 1, 1 Aug 28 15:35 vn1
crw-rw-rw- 1 root wheel 3, 3 Aug 28 15:35 zero

=Block Devices=
{| border="1" cellpadding="20" cellspacing="0"
|disk0
|iPhone flash memory (4, 8 or 16GB)
|-
| disk0s1
| OS partition. Stores / root file system.
|-
| disk0s2
| User space. Stores Music, Photos, Videos, Podcasts, Ringtones and Apps. Mounted as /private/var.
|-
| vn0
| unknown
|-
| vn1
| unknown
|-
|}

=Interesting Character Devices=
{|border="1" cellpadding="20" cellspacing="0"
|Dev Node
|Description
|Children
|-
| rdisk0
| RAW Disk; to access the Flash
| rdisk0s1 (root) rdisk0s2 (data)
|-
| dlci.spi-baseband
| iPhone Baseband Radio
| dlci.spi-baseband.0 - dlci.spi-baseband.15
|-
| tty.iap
| serial connection (pins 12 and 13 of the Dock connector)
|-
| uart.umts
| Serial connection to the Utms radio (?)
|-
| dlci.spi-baseband.9
| GPS device (read from by /usr/libexec/locationd82 for CoreLocation services)
|-
| mem
| Raw access to RAM (has been blocked since 1.0.2) Memory devices can be re-enabled with single WORD change within kernel.
| kmem, Raw access to Kernel Memory (also blocked since 1.0.2)
|-
| aes_0
| Access to AES engine. Works via complicated ioctl handshake. Not known why it exists, as use of the IOKit interface is much simpler.
|-
|}

The iPhone Wiki - User contributions [en]

Device Nodes