Always use bi-direction target communication

[novaboot.git] / README.md

diff --git a/README.md b/README.md
index 47d45f5306283d335142b6b4340fe6b7cea985f2..0900fb3daa50ef75b25f30c5e0455e76449b743d 100644 (file)
--- a/README.md
+++ b/README.md
@@ -78,24 +78,34 @@ corresponding options follows.
 
 After starting, novaboot reads configuration files. Their content is
 described in section ["CONFIGURATION FILE"](#configuration-file). By default,
-configuration is read from two locations. First from the configuration
-directory and second from `.novaboot` files along the path to the
-current directory. The latter read files override settings from the
-former ones.
-
-Configuration directory is determined by the content of
+configuration is read from multiple locations. First from the system
+configuration directory (`/etc/novaboot.d/`), second from the user
+configuration file (`~/.config/novaboot`) and third from `.novaboot`
+files along the path to the current directory. Alternatively, a single
+configuration file specified with the **-c** switch or with the
+`NOVABOOT_CONFIG` environment variable is read. The latter read files
+override settings from the former ones.
+
+The system configuration directory is determined by the content of
 NOVABOOT\_CONFIG\_DIR environment variable and defaults to
 `/etc/novaboot.d`. Files in this directory with names consisting
 solely of English letters, numbers, dashes '-' and underscores '\_'
 (note that dot '.' is not included) are read in alphabetical order.
 
-Then novaboot searches for files named `.novaboot` starting from the
+Then, the user configuration file is read from
+`$XDG_CONFIG_HOME/novaboot`. If `$XDG_CONFIG_HOME` environemnt
+variable is not set `~/.config/novaboot` is read instead.
+
+Finally, novaboot searches for files named `.novaboot` starting from the
 directory of the novaboot script (or working directory, see bellow)
 and continuing upwards up to the root directory. The found
 configuration files are then read in the opposite order (i.e. from the
-root directory downwards). This allows to have, for example, user
-specific configuration in `~/.novaboot` and project specific one in
-`~/project/.novaboot`.
+root directory downwards). This allows to have, for example, a project
+specific configuration in `~/project/.novaboot`.
+
+Note the difference between `~/.config/novaboot` and `~/.novaboot`.
+The former one is read always, whereas the latter only when novaboot
+script or working directory is under the `$HOME` directory.
 
 In certain cases, the location of the novaboot script cannot be
 determined in this early phase. This happens either when the script is
@@ -440,6 +450,10 @@ can currently be accomplished by the following options: **--amt**,
     Implementation of this option is currently tied to a particular board
     that we use. It may be subject to changes in the future!
 
+- --no-uboot
+
+    Disable U-Boot interaction previously enabled with **--uboot**.
+
 - --uboot-init
 
     Command(s) to send the U-Boot bootloader before loading the images and
@@ -458,6 +472,9 @@ can currently be accomplished by the following options: **--amt**,
     where name is one of _kernel_, _ramdisk_ or _fdt_ (flattened device
     tree).
 
+    The default addresses are ${_name_\_addr\_r}, i.e. U-Boot environment
+    variables used by convention for this purpose.
+
 - --uboot-cmd=_command_
 
     Specifies U-Boot command used to execute the OS. If the command
@@ -506,6 +523,11 @@ interactive work with the target.
     to the target and does no longer interrupt novaboot. Use "~~."
     sequence to exit novaboot.
 
+- --no-interaction, --interaction
+
+    Skip resp. force target interaction phase. When skipped, novaboot exits
+    immediately when boot is initiated.
+
 - --expect=_string_
 
     When _string_ is received from the target, send the string specified
@@ -670,15 +692,16 @@ The following variables are interpreted in the novaboot script:
 # CONFIGURATION FILE
 
 Novaboot can read its configuration from one or more files. By
-default, novaboot looks for files in `/etc/novaboot.d` and files
-named `.novaboot` as described in ["Configuration reading phase"](#configuration-reading-phase).
-Alternatively, configuration file location can be specified with the
-**-c** switch or with the NOVABOOT\_CONFIG environment variable. The
-configuration file has Perl syntax (i.e. it is better to put `1;` as
-a last line) and should set values of certain Perl variables. The
-current configuration can be dumped with the **--dump-config** switch.
-Some configuration variables can be overridden by environment
-variables (see below) or by command line switches.
+default, novaboot looks for files in `/etc/novaboot.d`, file
+`~/.config/novaboot` and files named `.novaboot` as described in
+["Configuration reading phase"](#configuration-reading-phase). Alternatively, configuration file
+location can be specified with the **-c** switch or with the
+NOVABOOT\_CONFIG environment variable. The configuration file has Perl
+syntax (i.e. it is better to put `1;` as the last line) and should set
+values of certain Perl variables. The current configuration can be
+dumped with the **--dump-config** switch. Some configuration variables
+can be overridden by environment variables (see below) or by command
+line switches.
 
 Supported configuration variables include: