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MULTIBOOT(8) NetBSD/x86 System Manager's Manual MULTIBOOT(8)
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multiboot -- procedure for booting NetBSD/x86 from a Multiboot-compliant
Multiboot is a specification that defines a protocol between a boot
loader and a kernel. This protocol allows passing boot information
between the two in a standard way, allowing any Multiboot-compliant boot
loader to boot any Multiboot-compliant kernel. The NetBSD kernel sup-
ports Multiboot if it was compiled with options MULTIBOOT (the default in
the `GENERIC' and `GENERIC_LAPTOP' configurations).
Unlike when using the native boot loader, the NetBSD kernel recognizes a
set of command line arguments if booted through a Multiboot-compliant
boot loader. This is because the Multiboot protocol is not complete
enough to completely configure a NetBSD kernel.
The following arguments are recognized:
console Specifies the console device name. Can be one of `com'
or `pc'. If the former, console_addr and console_speed
should be given too.
console_addr Specifies the serial port address for the console.
Defaults to the value of options CONADDR or `0x3f8' if
this was not given.
console_speed Specifies the serial port speed for the console.
Defaults to the value of options CONSPEED or `9600' if
this was not given.
root Specifies the name of the device to be mounted as the
root partition. It should not be needed because the ker-
nel tries its best to guess which is the root partition
(basing the decision on the device from which the kernel
was loaded from). In cases where the automatic detection
fails, this flag comes useful. Example: `root=wd0e'.
Booting with GRUB Legacy
GRUB Legacy is the most popular bootloader that supports Multiboot. You
can boot a NetBSD kernel (assuming it is compiled with Multiboot support)
with a line similar to the following one:
kernel (fd0)/netbsd.gz -c console=pc root=wd0e
multiboot support first appeared in NetBSD 4.0.
multiboot support was added by Julio M. Merino Vidal <jmmv@NetBSD.org>.
NetBSD 9.3 October 25, 2006 NetBSD 9.3