diff options
Diffstat (limited to 'bitbake/doc/bitbake-user-manual/bitbake-user-manual-execution.xml')
-rw-r--r-- | bitbake/doc/bitbake-user-manual/bitbake-user-manual-execution.xml | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/bitbake/doc/bitbake-user-manual/bitbake-user-manual-execution.xml b/bitbake/doc/bitbake-user-manual/bitbake-user-manual-execution.xml index 8b6e0b442f..571424b99f 100644 --- a/bitbake/doc/bitbake-user-manual/bitbake-user-manual-execution.xml +++ b/bitbake/doc/bitbake-user-manual/bitbake-user-manual-execution.xml @@ -7,7 +7,8 @@ <para> The primary purpose for running BitBake is to produce some kind of output such as a single installable package, a kernel, a software - development kit, or even a full, board-specific bootable Linux image. + development kit, or even a full, board-specific bootable Linux image, + complete with bootloader, kernel, and root filesystem. Of course, you can execute the <filename>bitbake</filename> command with options that cause it to execute single tasks, compile single recipe files, capture or clear data, or simply @@ -45,6 +46,11 @@ build host with hyper-threading will most likely show eight processors, which is the value you would then assign to that variable. </para> + + <para> + A possibly simpler solution is that some Linux distributions + (e.g. Debian and Ubuntu) provide the <filename>ncpus</filename> command. + </para> </note> </para> @@ -464,6 +470,29 @@ PREFERRED_VERSION_a = "1.1" </literallayout> </para> + + <note> + <para> + It is common for a recipe to provide two versions -- a stable, + numbered (and preferred) version, and a version that is + automatically checked out from a source code repository that + is considered more "bleeding edge" but can be selected only + explicitly. + </para> + + <para> + For example, in the OpenEmbedded codebase, there is a standard, + versioned recipe file for BusyBox, + <filename>busybox_1.22.1.bb</filename>, + but there is also a Git-based version, + <filename>busybox_git.bb</filename>, which explicitly contains the line + <literallayout class='monospaced'> + DEFAULT_PREFERENCE = "-1" + </literallayout> + to ensure that the numbered, stable version is always preferred + unless the developer selects otherwise. + </para> + </note> </section> <section id='bb-bitbake-dependencies'> |