Configuration file syntax is described in section L</"CONFIGURATION
FILES">.
+Novaboot newcomers may be confused by a large number of configuration
+options. Understanding all these options is not always needed,
+depending on the used setup. The L<figure from the doc directory
+|https://github.com/wentasah/novaboot/blob/master/doc/typical-setups.svg>
+shows different setups that vary in how much effort is needed
+to configure novaboot for them. The setups are:
+
+=over 3
+
+=item A: Laptop and target device only
+
+This requires to configure everything on the laptop side, including a
+serial line connection (L</--serial>, L</--remote-cmd>, ...), power
+on/off/reset commands (L</--reset-cmd>, ...), TFTP server
+(L</--copy>, L</--prefix>...), device IP addresses, etc.
+
+=item B: Laptop, target device and external TFTP server
+
+Like the previous setup, but the TFTP (and maybe DHCP) configuration
+is handled by a server. Novaboot users need to understand where to
+copy their files to the TFTP server (L</--copy>) and which IP
+addresses their target will get, but do not need to configure the
+servers themselves.
+
+=item C: Novaboot server running novaboot-shell
+
+With this setup, the configuration is done on the server. Users only
+need to know the SSH account (L</--ssh>) used to communicate between
+novaboot and novaboot server. The server is implemented as a
+restricted shell (L<novaboot-shell(1)>) on the server. No need to give
+full shell access to novaboot users on the server.
+
+=back
+
=head2 Simple examples of using C<novaboot>:
To boot Linux (files F<bzImage> and F<rootfs.cpio> in current
use a TCP/IP-controlled relay/serial-to-TCP converter to reset the
target and receive its serial output.
- ./mylinux --grub2 --server=192.168.1.1:/tftp --iprelay=192.168.1.2
+ ./mylinux --grub2 --copy=192.168.1.1:/tftp --iprelay=192.168.1.2
Alternatively, you can put these switches to the configuration file
and run:
=back
-=head1 PHASES AND OPTIONS
+=head1 OPTIONS AND PHASES
Novaboot performs its work in several phases. Command line options
described bellow influence the execution of each phase or allow their
running remotely via SSH.
Using this option is the same as specifying B<--remote-cmd>,
-B<--remote-expect>, B<--server> B<--rsync-flags>, B<--prefix> and
+B<--remote-expect>, B<--copy> B<--rsync-flags>, B<--prefix> and
B<--reset-cmd> manually in a way compatible with C<novaboot-shell>.
The server can be configured to provide other, safe bootloader-related
options, to the client. When this happens, novaboot prints them to
=item --grub2[=I<filename>]
Generate GRUB2 menu entry in I<filename>. If I<filename> is not
-specified F<grub.cfg> is used. The content of the menu entry can be
+specified F<./boot/grub/grub.cfg> is used. The content of the menu entry can be
customized with B<--grub-preamble>, B<--grub2-prolog> or
B<--grub_prefix> options.
+GRUB2 can boot multiboot-compliant kernels and a few kernels with specific
+support. L</BOOT_METHOD> could be used to specify the command used by GRUB2 to
+load the kernel. See L<GNU GRUB Manual|https://www.gnu.org/software/grub/manual/grub/grub.html#Booting>.
+
To use the generated menu entry on your development
machine that uses GRUB2, append the following snippet to
F</etc/grub.d/40_custom> file and regenerate your grub configuration,
=item --remote-expect=I<string>
-Wait for reception of I<string> after establishing the remote
-connection. This option is needed when novaboot should wait for
-confirmation before deploying files to the target, e.g. to not
-overwrite other user's files when they are using the target.
+Wait for reception of I<string> after establishing the remote serial
+line connection. Novaboot assumes that after establishing the serial
+line connection, the user running novaboot has exclusive access to the
+target. If establishing of the serial line connection happens
+asynchronously (e.g. running a command remotely via SSH), we need this
+option to wait until the exclusive access is confirmed by the remote
+side.
+
+Depending on target configuration, this option can solve two practical
+problems: 1) Overwriting of files deployed by another user currently
+using the target. 2) Resetting the target board before serial line
+connection is established and thus missing bootloader interaction.
+
+Example of usage with the L<sterm
+tool|https://rtime.felk.cvut.cz/gitweb/sojka/sterm.git>:
+
+ --remote-cmd='ssh -tt example.com sterm -v /dev/ttyUSB0' --remote-expect='sterm: Connected'
=item --remote-expect-silent=I<string>
=item --netif=I<network interface>
-Network interface used to deploy files to the target. The default value is
-I<eth0>. This option influences the configuration of the DHCP server started
-by B<--dhcp-tftp> and the value that B<$NB_MYIP> get replaced with during
-U-Boot conversation.
+Network interface used to deploy files to the target. This option
+influences the configuration of the DHCP server started by
+B<--dhcp-tftp> and the value that B<$NB_MYIP> get replaced with during
+U-Boot conversation. The default value is C<$netif> variable from
+configuration files, which defaults to I<eth0>.
=item --iso[=filename]
=item --server[=[[user@]server:]path]
+Alias of B<--copy> (kept for backward compatibility).
+
+=item --copy[=[[user@]server:]path]
+
Copy all files needed for booting to another location. The files will
be copied (by B<rsync> tool) to the directory I<path>. If the I<path>
contains string $NAME, it will be replaced with the name of the
=item --rsync-flags=I<flags>
Specifies I<flags> to append to F<rsync> command line when
-copying files as a result of I<--server> option.
+copying files as a result of I<--copy> option.
=item --concat
-If B<--server> is used and its value ends with $NAME, then after
+If B<--copy> is used and its value ends with $NAME, then after
copying the files, a new bootloader configuration file (e.g. menu.lst)
-is created at I<path-wo-name>, i.e. the path specified by B<--server>
+is created at I<path-wo-name>, i.e. the path specified by B<--copy>
with $NAME part removed. The content of the file is created by
concatenating all files of the same name from all subdirectories of
I<path-wo-name> found on the "server".
=item --exiton-timeout=I<seconds>
By default B<--exiton> waits for the string match forever. When this
-option is specified, "exiton" timeouts after the specifies the number of
+option is specified, "exiton" timeouts after the specified number of
seconds and novaboot returns non-zero exit code.
=item -i, --interactive
(see B<--build-dir>) of the module to load and the remaining words are
passed to it as the command line parameters.
+When booting Linux, the first C<load> line usually refers to the
+kernel image and its command line parameters (unless you use some
+special pre-loader). Other C<load> lines may refer to an initramfs
+image and/or a device tree blob. Their order is not important, as the
+device tree is recognized as the file name ending with C<.dtb>.
+
When the C<load> line ends with "<<WORD" then the subsequent lines
until the line containing solely WORD are copied literally to the file
-named on that line. This is similar to shell's heredoc feature.
+named on that line. This is similar to the heredoc feature of UNIX
+shells.
When the C<load> line ends with "< CMD" then command CMD is executed
with F</bin/sh> and its standard output is stored in the file named on
=over 8
+=item BOOT_METHOD
+
+Specifies the way GRUB2 boots the kernel. For kernels with multiboot
+support use C<multiboot> method (the default). For Linux kernel use C<linux> method.
+
=item BUILDDIR
Novaboot chdir()s to this directory before file generation phase. The
specified with the B<--target> command line option or
B<NOVABOOT_TARGET> environment variable.
+=item $netif
+
+Default value for the B<--netif> option. If not specified, it defaults
+to I<eth0>.
+
=item %targets
Hash of target definitions to be used with the B<--target> option. The
key is the identifier of the target, the value is the string with
command line options. For instance, if the configuration file contains:
- $targets{'mybox'} = '--server=boot:/tftproot --serial=/dev/ttyUSB0 --grub',
+ $targets{'mybox'} = '--copy=boot:/tftproot --serial=/dev/ttyUSB0 --grub',
then the following two commands are equivalent:
- ./myos --server=boot:/tftproot --serial=/dev/ttyUSB0 --grub
+ ./myos --copy=boot:/tftproot --serial=/dev/ttyUSB0 --grub
./myos -t mybox
=back
projects / novaboot.git / blobdiff