-v = verbose mode. Basically tells you wants happening during boot up.
-x = Safe mode. Basically boots your system with the bare minimum kexts.
-s = Single user mode. Command line only mode. Allows you to run commands as root to fix system.
-f = Tells the machine to reload all kext and dump the boot configuration cache, (kext cache found in: /System/Library/Extensions.mkext, you can delete it manually and the system will recreate it).
"Graphics Mode"= Tells the system what resolution width, height, color depth & refresh rate to boot the OS with.
Ex: "Graphics Mode"="1024x768x32" WIDTHxHEIGHTxDEPTH
For VESA 3.0 graphics, you may append a refresh rate after an "@" character
Ex: "Graphics Mode"="640x480x32@60" WIDTHxHEIGHTxDEPTH@REFRESHRATE
rd= This parameter state what is the boot disk to use (instead of using the boot menu appearing before the prompt) you state the drive and partition in here: diskXsY where X stands for the disk number (first disk, usually primary master in IDE or SATA) 0 second disk is 1 etc.) and Y stands for the partition on that disk starting with 1 as the first partition.
Ex: rd=disk0s1 If you have one disk and one partition the parameter will look like this.
You can also use rd=*<IODeviceTree path> for booting from a PCI RAID card for example. Ex: of this would be rd=*/PCI0@0/CHN0@0/@0:1
Platform= this parameter sets the platform to use at this boot time.
Examples of this flag are:
platform=ACPI (ACPI support)
platform=X86PC (non ACPI support)
platform=ACPI|86PC (try to support ACPI if fails do not support it)
?memory = this info screen display information about the memory on the machine
?video = this info screen display information about the video card supported graphic modes
ACPI Flags
acpi=off = Don't enable ACPI
acpi=ht = Use ACPI boot table parsing, but don't enable ACPI interpreter
acpi=force = Force ACPI on (currently not needed)
acpi=strict = Disable out of spec ACPI workarounds.
acpi_sci= {edge,level,high,low} Set up ACPI SCI interrupt. EX: acpi_sci=edge
acpi=noirq = Don't route interrupts
-x = Safe mode. Basically boots your system with the bare minimum kexts.
-s = Single user mode. Command line only mode. Allows you to run commands as root to fix system.
-f = Tells the machine to reload all kext and dump the boot configuration cache, (kext cache found in: /System/Library/Extensions.mkext, you can delete it manually and the system will recreate it).
"Graphics Mode"= Tells the system what resolution width, height, color depth & refresh rate to boot the OS with.
Ex: "Graphics Mode"="1024x768x32" WIDTHxHEIGHTxDEPTH
For VESA 3.0 graphics, you may append a refresh rate after an "@" character
Ex: "Graphics Mode"="640x480x32@60" WIDTHxHEIGHTxDEPTH@REFRESHRATE
rd= This parameter state what is the boot disk to use (instead of using the boot menu appearing before the prompt) you state the drive and partition in here: diskXsY where X stands for the disk number (first disk, usually primary master in IDE or SATA) 0 second disk is 1 etc.) and Y stands for the partition on that disk starting with 1 as the first partition.
Ex: rd=disk0s1 If you have one disk and one partition the parameter will look like this.
You can also use rd=*<IODeviceTree path> for booting from a PCI RAID card for example. Ex: of this would be rd=*/PCI0@0/CHN0@0/@0:1
Platform= this parameter sets the platform to use at this boot time.
Examples of this flag are:
platform=ACPI (ACPI support)
platform=X86PC (non ACPI support)
platform=ACPI|86PC (try to support ACPI if fails do not support it)
?memory = this info screen display information about the memory on the machine
?video = this info screen display information about the video card supported graphic modes
ACPI Flags
acpi=off = Don't enable ACPI
acpi=ht = Use ACPI boot table parsing, but don't enable ACPI interpreter
acpi=force = Force ACPI on (currently not needed)
acpi=strict = Disable out of spec ACPI workarounds.
acpi_sci= {edge,level,high,low} Set up ACPI SCI interrupt. EX: acpi_sci=edge
acpi=noirq = Don't route interrupts
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