2020-09-07 12:24:12 +05:30
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tinyramfs.cmdline(7)
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# NAME
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Tinyramfs - kernel command-line parameters
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# DESCRIPTION
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Tinyramfs provides a way to control configuration dynamically via
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kernel parameters without needing to regenerate initramfs image.
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## MAN PAGE SYNTAX
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```
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| - OR
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... - can be repeated
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```
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# GENERAL PARAMETERS
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*debug*=1
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Enable debug mode.
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*break*=breakpoint
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Specify breakpoint where shell should be invoked. Useful for
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2020-09-11 01:23:39 +05:30
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debugging. List of builtin breakpoints:
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2020-09-07 12:24:12 +05:30
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- root
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- boot
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2020-09-11 01:23:39 +05:30
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Hooks can provide their own breakpoints. See source code of hooks
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for more information.
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2020-09-07 12:24:12 +05:30
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*root*=UUID|LABEL|/dev/\*|PARTUUID
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Specify which way tinyramfs will use to look up root filesystem.
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- UUID - lookup device by uuid
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- LABEL - lookup device by label
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- /dev/\* - lookup device by full path
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- PARTUUID - lookup device by partition uuid
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Initramfs must contain *blkid*(8) for ability to use UUID, LABEL,
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PARTUUID. Note that PARTUUID only supported in util-linux *blkid*(8).
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*root_type*|*rootfstype*=type
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Explicitly set root filesystem type. Kernel must support specified type.
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*rootdelay*=delay
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Specify maximum number of seconds to wait for root device. Default is 30.
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*root_opts*|*rootflags*=opts
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See *fstab*(5) fourth field.
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# HOOKS PARAMETERS
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Initramfs must contain appropriate hooks for ability to use below parameters.
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## LVM
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*lvm_tag*=tag
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Specify LVM tag which will be used to trigger LVM. This option will be
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ignored if *lvm_name*/*lvm_group* was specified.
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*lvm_name*=name
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Specify LVM name which will be used to trigger LVM. *lvm_group* must be
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specified.
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*lvm_group*=group
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Specify LVM group which will be used to trigger LVM.
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*lvm_discard*=1
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Pass issue_discards to lvm. Leave empty to disable. Useful for SSD's.
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## LUKS
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*luks_name*=name
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Specify which name will be registered to mapping table after cryptsetup
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unlocks LUKS root.
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*luks_root*=UUID|LABEL|/dev/\*|PARTUUID
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See *root* for details.
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*luks_discard*=1
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Pass --allow-discards to *cryptsetup*. Leave empty to disable. Useful for
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SSD's, but you must know that security will be decreased.
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# EXAMPLES
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## ROOT
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```
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vmlinuz initrd=\initramfs root=/dev/sda1 ...
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```
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## DISABLE DISCARD
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```
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vmlinuz initrd=\\initramfs luks_discard= lvm_discard= ...
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```
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## PASS ARGUMENTS TO REAL INIT
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```
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vmlinuz initrd=\\initramfs ... -- args
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```
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# SEE ALSO
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*tinyramfs*(8) *tinyramfs.config*(5) *tinyramfs.hooks*(7)
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