1 | The boot: prompt waits for you to type advanced startup options.␊ |
2 | If you don't type anything, the computer continues starting up normally. It␊ |
3 | uses the kernel and configuration files on the startup device, which it also␊ |
4 | uses as the root device. ␊ |
5 | ␊ |
6 | Advanced startup options use the following syntax:␊ |
7 | ␊ |
8 | [device]<kernel> [arguments]␊ |
9 | ␊ |
10 | Example arguments include␊ |
11 | ␊ |
12 | device: rd=<BSD device name> (e.g. rd=disk0s2)␊ |
13 | rd=*<IODeviceTree path> (e.g. rd=*/PCI0@0/CHN0@0/@0:1)␊ |
14 | ␊ |
15 | kernel: kernel name (e.g. "mach_kernel" - must be in "/" )␊ |
16 | ␊ |
17 | flags: -v (verbose) -s (single user mode)␊ |
18 | -x (safe mode) -f (ignore caches)␊ |
19 | -F (ignore "Kernel Flags" specified in boot configuration file)␊ |
20 | ␊ |
21 | "Graphics Mode"="WIDTHxHEIGHTxDEPTH" (e.g. "1024x768x32")␊ |
22 | ␊ |
23 | kernel flags (e.g. debug=0x144)␊ |
24 | io=0xffffffff (defined in IOKit/IOKitDebug.h)␊ |
25 | ␊ |
26 | Example: mach_kernel rd=disk0s1 -v "Graphics Mode"="1920x1200x32"␊ |
27 | ␊ |
28 | If the computer won't start up properly, you may be able to start it up ␊ |
29 | using safe mode. Type -x to start up in safe mode, which ignores all ␊ |
30 | cached driver files.␊ |
31 | ␊ |
32 | Special booter hotkeys:␊ |
33 | F5 Rescans optical drive.␊ |
34 | F10 Scans and displays all BIOS accessible drives.␊ |
35 | ␊ |
36 | Special booter commands:␊ |
37 | ?memory Displays information about the computer's memory.␊ |
38 | ?video Displays VESA video modes supported by the computer's BIOS.␊ |
39 | ?norescan Leaves optical drive rescan mode.␊ |
40 | ␊ |
41 | Additional useful command-line options:␊ |
42 | config=<file> Use an alternate Boot.plist file.␊ |
43 | ␊ |
44 | Options useful in the com.apple.Boot.plist file:␊ |
45 | Wait=Yes|No Prompt for a key press before starting the kernel.␊ |
46 | "Quiet Boot"=Yes|No Use quiet boot mode (no messages or prompt).␊ |
47 | Timeout=8 Number of seconds to pause at the boot: prompt.␊ |
48 | "Instant Menu"=Yes Force displaying the partition selection menu. ␊ |
49 | ␊ |
50 | "Default Partition" Sets the default boot partition,␊ |
51 | =hd(x,y)|UUID|"Label" Specified as a disk/partition pair, an UUID, or a ␊ |
52 | label enclosed in quotes.␊ |
53 | ␊ |
54 | "Hide Partition" Remove unwanted partition(s) from the boot menu.␊ |
55 | =partition Specified, possibly multiple times, as hd(x,y), an␊ |
56 | [;partition2 ...] UUID or label enclosed in quotes.␊ |
57 | ␊ |
58 | "Rename Partition" Rename partition(s) for the boot menu.␊ |
59 | =partition <alias> Where partition is hd(x,y), UUID or label enclosed␊ |
60 | [;partition2 <alias2> in quotes. The alias can optionally be quoted too. ␊ |
61 | ...]␊ |
62 | ␊ |
63 | PciRoot=<value> Use an alternate value for PciRoot (default value 0).␊ |
64 | ␊ |
65 | "Scan Single Drive" Scan the drive only where the booter got loaded from.␊ |
66 | =Yes|No Fix rescan pbs when using a DVD reader in AHCI mode. ␊ |
67 | Rescan=Yes Enable CD-ROM rescan mode.␊ |
68 | "Rescan Prompt"=Yes Prompts for enable CD-ROM rescan mode.␊ |
69 | SystemId=<UUID> Set manually the system id UUID,␊ |
70 | SMUUID in smbios config (reserved field) isn't used.␊ |
71 | SystemType=<n> Set the system type where n is between 0..6␊ |
72 | (default =1 (Desktop)␊ |
73 | ␉␉␉␉␉␉ |