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Difference between revisions of "Boot-args (iBoot variable)"
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m (rd/rootdev confusion; I don't backlight-level is a boot-arg, only an env variable) |
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| − | + | These are boot arguments that the iOS [[kernel]] accepts. These can be booted with a patched [[iBoot]]; untethered [[BootROM]] jailbreaks such as [[redsn0w]] and [[checkra1n]] do this when you set custom boot-args. |
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| − | =Known |
+ | = Known Boot Arguments = |
| + | {| class="wikitable" |
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| − | * "rd=md0 nand-enable-reformat=1 -progress" (Used in restore (and update?) ramdisks) |
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| + | |- |
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| − | * pmd= (used in the [[Ramdisk Hack]]) |
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| + | ! boot-arg |
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| − | * 1 (?) |
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| + | ! Values |
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| − | * "-v" ([[Verbose boot]]) |
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| + | ! Description |
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| − | * auto-boot (true/false. False does not try to boot the kernelcache) |
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| + | ! Notes |
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| − | * backlight-level (value from 1 to 128 for backlight level) |
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| + | |- |
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| − | * debug=# (# can be replaced with 0x09 for kernel debugging) |
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| + | | debug=# |
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| − | * serial=3 (same as [[Debug-uarts (iBoot variable)]]) |
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| + | | <code>0x09</code>: Kernel debugging |
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| + | | Set kernel debug options |
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| + | | |
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| + | |- |
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| + | | nand-enable-reformat=# |
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| + | | <code>0</code>, <code>1</code> |
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| + | | Set whether or not to reformat [[NAND]] when restoring |
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| + | | Used when [[Restore Process|restoring]] |
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| + | |- |
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| + | | pmd=#.# |
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| + | | Start/end address of ramdisk |
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| + | | Specify a [[Ramdisk|ramdisk]] in memory to boot from |
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| + | | Used in the [[Ramdisk Hack]] |
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| + | |- |
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| + | | -progress |
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| + | | {{n/a}} |
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| + | | Enable progress bar when restoring |
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| + | | Used when [[Restore Process|restoring]] |
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| + | |- |
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| + | | rd=? |
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| + | | <code>'md#'</code> |
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| + | | Specify the root device to boot from |
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| + | | Used when [[Restore Process|restoring]]; same as <code>rootdev</code> |
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| + | |- |
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| + | | rootdev=? |
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| + | | <code>'md#'</code> |
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| + | | Specify the root device to boot from |
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| + | | Same as <code>rd</code> |
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| + | |- |
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| + | | serial=# |
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| + | | <code>3</code>: Debug output over serial |
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| + | | Set serial debug options |
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| + | | Same as <code>[[Debug-uarts (iBoot variable)|debug-uarts]]</code> |
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| + | |- |
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| + | | -v |
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| + | | {{n/a}} |
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| + | | Enable verbose booting |
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| + | | |
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| + | |- |
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| + | |} |
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| + | |||
| + | = See Also = |
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| + | * [[Talk:Restore Mode]] |
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Latest revision as of 21:15, 9 June 2020
These are boot arguments that the iOS kernel accepts. These can be booted with a patched iBoot; untethered BootROM jailbreaks such as redsn0w and checkra1n do this when you set custom boot-args.
Known Boot Arguments
| boot-arg | Values | Description | Notes |
|---|---|---|---|
| debug=# | 0x09: Kernel debugging
|
Set kernel debug options | |
| nand-enable-reformat=# | 0, 1
|
Set whether or not to reformat NAND when restoring | Used when restoring |
| pmd=#.# | Start/end address of ramdisk | Specify a ramdisk in memory to boot from | Used in the Ramdisk Hack |
| -progress | N/A | Enable progress bar when restoring | Used when restoring |
| rd=? | 'md#'
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Specify the root device to boot from | Used when restoring; same as rootdev
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| rootdev=? | 'md#'
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Specify the root device to boot from | Same as rd
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| serial=# | 3: Debug output over serial
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Set serial debug options | Same as debug-uarts
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| -v | N/A | Enable verbose booting |
