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# Kernel command line arguments
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To allow some flexibility of the kernel main features without compiling it each time, it is possible
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to use "command line arguments".
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These arguments are passed to the kernel from the bootloader, as a list of key=value strings.
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For default sh3 target, command line arguments are expected at address 0x88000000 (first physical RAM page), and 1024 bytes are reserved for them.
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## Supported arguments
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Here is a list of supported arguments, possible values, and a description of them.
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- console=<device> : set the device used by the kernel console (for displaying printk() logs).
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Default is the first virtual terminal, tty1.
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- console=tty*x* : use the VT *x*
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- console=ttyUSB0 : use the USB CDC/ACM device (emulation of a serial communication through USB device protocol)
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- *others may be added later*
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- loglevel=<level> : set the dynamic log level, used to determine which messages from printk() are displayed on the console.
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A value of 0 display everything (including debug messages), and a value of 7 avoid any message to be displayed (even critical error messages!).
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Please see [utils/log.h](/fixos-core-team/fixos/blob/master/utils/log.h) for defintion of each level.
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- init=</absolute/path> : set the *init* executable file path, which is the first user space program loaded by the kernel as soon as it is initialized
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