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# Zircon Kernel Commandline Options
TODO([fxbug.dev/53594](https://fxbug.dev/53594)): move kernel_cmdline.md verbiage here
## Options common to all machines
### kernel.entropy-mixin=\<hexadecimal>
Provides entropy to be mixed into the kernel's CPRNG. The value must be a
string of lowercase hexadecimal digits.
The original value will be scrubbed from memory as soon as possible and will be
redacted from all diagnostic output.
### kernel.serial=[none | legacy | qemu | \<type>,\<base>,\<irq>]
**Default:** `none`
TODO(53594)
## Options available only on x86 machines
### kernel.x86.disable_spec_mitigations=\<bool>
**Default:** `false`
TODO(53593)
### kernel.x86.md_clear_on_user_return=\<bool>
**Default:** `true`
TODO(53593)
### kernel.x86.pti.enable=\<uint32_t>
**Default:** `0x2`
TODO(53593)
### kernel.x86.spec_store_bypass_disable=\<bool>
**Default:** `false`
TODO(53593)
TODO: put something here