diff options
Diffstat (limited to 'distribution/yocto-basic/yocto-workflow.tex')
| -rw-r--r-- | distribution/yocto-basic/yocto-workflow.tex | 79 |
1 files changed, 68 insertions, 11 deletions
diff --git a/distribution/yocto-basic/yocto-workflow.tex b/distribution/yocto-basic/yocto-workflow.tex index 3810acb..3d9651a 100644 --- a/distribution/yocto-basic/yocto-workflow.tex +++ b/distribution/yocto-basic/yocto-workflow.tex @@ -8,7 +8,7 @@ \begin{verbatim} % git clone http://git.yoctoproject.org/git/poky % cd poky -% git checkout origin/krogoth -b krogoth -t +% git checkout origin/pyro -b pyro -t \end{verbatim} \end{frame} @@ -106,7 +106,6 @@ poky \begin{verbatim} VAR = "value" \end{verbatim} -\pause \begin{itemize} \item normal assignment \item values need to be surrounded by double quotes @@ -119,7 +118,6 @@ VAR = "value" VAR ?= "1" VAR ?= "2" \end{verbatim} -\pause \begin{itemize} \item VAR is set to "1" in this example \item if there are multiple assignments using ?= the first one is used @@ -132,7 +130,6 @@ VAR ?= "2" VAR ??= "1" VAR ??= "2" \end{verbatim} -\pause \begin{itemize} \item VAR is set to "2" in this example \item if there are multiple assignments using ??= the last one is used @@ -148,7 +145,6 @@ VAR_A ?= "34" VAR_B ?= "12" VAR_B ??= "34" \end{verbatim} -\pause \begin{itemize} \item VAR\_A contains "34" \item VAR\_B contains "12" @@ -164,7 +160,6 @@ VAR = "56" VAR ?= "78" VAR ??= "78" \end{verbatim} -\pause \begin{itemize} \item VAR contains "56" \end{itemize} @@ -180,7 +175,6 @@ VAR_C := "C:${VAR_A}" VAR_A = "33" echo ${VAR_A} ${VAR_B} ${VAR_C} \end{verbatim} -\pause \begin{itemize} \item 33 B:33 C:22 \item the content of VAR\_C is expanded immediately on assignment @@ -196,7 +190,6 @@ VAR_A += "34" VAR_B = "56" VAR_B =+ "78" \end{verbatim} -\pause \begin{itemize} \item VAR\_A contains "12 34" \item VAR\_B contains "78 56" @@ -212,7 +205,6 @@ VAR_A .= "34" VAR_B = "56" VAR_B =. "78" \end{verbatim} -\pause \begin{itemize} \item VAR\_A contains "1234" \item VAR\_B contains "7856" @@ -232,6 +224,55 @@ FOO="456" \end{verbatim} \end{frame} +\begin{frame}[fragile] +\frametitle{prepend/append} +\begin{verbatim} +VAR = "34" +VAR_append = "56" +VAR_prepend = "12" +\end{verbatim} +\begin{itemize} + \item VAR contains "123456" + \item there are no spaces between the appended values +\end{itemize} +\end{frame} + +\begin{frame}[fragile] +\frametitle{overrides} +\begin{verbatim} +OVERRIDES="string1:string2" +VAR = "foo" +VAR_string1 = "bar" +\end{verbatim} +\begin{itemize} + \item if string1 is listed in OVERRIDES, use "bar" for value of VAR, otherwise use "foo" +\end{itemize} +\end{frame} + +\begin{frame}[fragile] +\frametitle{variable flags} +\begin{verbatim} +VAR[some_flag]="foo" +\end{verbatim} +\begin{itemize} + \item associate a subsidiary flag value to a variable +\end{itemize} +\end{frame} + +\begin{frame}[fragile] +\frametitle{Key Expansion} +Key expansion happens when the BitBake datastore is finalized just before BitBake expands overrides. +\begin{verbatim} +A${B} = "X" +B = "2" +A2 = "Y" +\end{verbatim} +\begin{itemize} + \item Key expansion happens just before BitBake expands overrides. + \item A2 contains "X" +\end{itemize} +\end{frame} + \subsection{Recipes} \begin{frame} \frametitle{typical progressing} @@ -319,7 +360,6 @@ which gives the developer an opportunity to review any license change. \begin{verbatim} SRC_URI = "<protocol>://<host>/<path>;<OptionA=xxx>;<OptionB=xxx>" \end{verbatim} -\pause multiple urls can be set in a SRC\_URI variable: \begin{verbatim} SRC_URI = "<url1>;name=url1 <url2>;name=url2" @@ -436,6 +476,23 @@ predefined classes are: \end{itemize} \end{frame} +\begin{frame} +\frametitle{include} +Includes a complete file +\begin{itemize} +\item include examle-defs.inc +\item includes the first file it can find within BBPATH +\end{itemize} +\end{frame} + +\begin{frame} +\frametitle{require} +Same as include, but returns an error, if include file not found. +\begin{itemize} +\item includes the first file it can find within BBPATH +\end{itemize} +\end{frame} + \subsection{Append files} \begin{frame} \frametitle{basics} @@ -469,7 +526,7 @@ an append file must be named after the base package: \frametitle{basics} \begin{itemize} \item are defined and ordered in classes - \item can be overriden by classes and recipes + \item can be overridden by classes and recipes \end{itemize} \end{frame} |