BOOT32(8) | System Manager's Manual (acorn32) | BOOT32(8) |
boot32
—
Bootloader for
NetBSD/acorn32
*boot32 |
[-acdqsv ] [root=rootdir]
[file] |
boot32
is a program that runs under RISC
OS and launches the NetBSD/acorn32 kernel. It needs
to be installed in a RISC OS filesystem and given file type FFA (Module).
The kernel it is to load also needs to be stored in a RISC OS
filesystem.
It takes the following standard NetBSD options, which set flags in the boothowto variable in the booted kernel (see boothowto(9)). Not all flags may be effective.
-a
RB_ASKNAME
) Cause the kernel to prompt the user
for the name of the device containing the root filesystem. This also
causes boot32
to prompt for the name of the kernel
to be loaded.-s
RB_SINGLE
) Cause the kernel to ask
init
to boot into single-user mode.-d
RB_KDB
) Cause the kernel to enter the kernel
debugger as soon as possible.-c
RB_USERCONF
) Enter the in-kernel device
configuration manager before attaching any devices.-q
AB_QUIET
) Cause the kernel to emit fewer messages
than normal while starting up.-v
AB_VERBOSE
) Cause the kernel to emit more
messages than normal while starting up.boot32
attempts to load the kernel from
the RISC OS file specified as file, or from
netbsd if file is not
specified. The file must be an ELF image, and may have been compressed using
gzip(1).
boot32
is implemented as a RISC OS
relocatable module. It can be loaded into memory by running
‘*RMLoad boot32
’. After this,
NetBSD can be booted by running
‘*boot32
’ as usual, but the command
will be handled by the module.
It should also be possible to arrange for
boot32
to be loaded from ROM (e.g., from the ROM on
an expansion card), in which case NetBSD could be
made to boot automatically by making boot32
the
configured language using ‘*Configure
Language
’.
When it starts up, boot32
displays the
number of 4 kilobyte memory pages it has been delegated by RISC-OS and gives
a summary about the memory map as reported by RISC-OS followed by a table of
physical memory ranges available to the bootloader. All this information is
mainly for bughunting booting problems.
It then checks its internal structures and kicks out RISC-OS,
relocates all memory pages loaded in to their final destinations and
kickstarts boot32
.
boot32
in the
NetBSD filesystem.gzip(1), reboot(2), ddb(4), userconf(4), init(8), boothowto(9)
boot32
was introduced in
NetBSD 1.6 as a replacement for the original
NetBSD/arm32 bootloader, which was written in BBC
BASIC.
boot32
cannot load kernels from a
NetBSD filesystem.
September 4, 2009 | NetBSD 10.99 |