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+Frequently Asked Questions (FAQ)
+Q: PTXdist does not support to generate some files in a way I need them. What can I do?
+A: Everything PTXdist builds is controlled by “package rule files”,
+which in fact are Makefiles (``rules/*.make``). If you modify such a
+file you can change it’s behaviour in a way you need. It is generally
+no good idea to modify the generic package rule files installed by
+PTXdist, but it is always possible to copy one of them over into the
+``rules/`` directory of a project. Package rule files in the project
+will precede global rule files with the same name.
+Q: My kernel build fails. But I cannot detect the correct position,
+due to parallel building. How can I stop PTXdist to build in parallel?
+A: Force PTXdist to stop building in parallel which looks somehow
+ $ ptxdist -j1 go
+Q: I made my own rule file and now I get error messages like
+ my_project/rules/test.make:30: *** unterminated call to function `call': missing `)'. Stop.
+But line 30 only contains ``@$(call targetinfo, $@)`` and it seems all
+right. What does it mean?
+A: Yes, this error message is confusing. But it usually only means
+that you should check the following (!) lines for missing backslashes
+Q: I got a message similar to “package <some name> is empty. not
+generating.” What does it mean?
+A: The ’ipkg’ tool was advised to generate a new ipkg-packet, but the
+folder was empty. Sometime it means a typo in the package name when
+the ``install_copy`` macro was called. Ensure all these macros are using
+the same package name. Or did you disable a menuentry and now nothing
+will be installed?
+Q: How do I download all required packages at once?
+A: Run this command prior the build:
+ $ ptxdist make get
+This starts to download all required packages in one run. It does
+nothing if the archives are already present in the source path. (run
+“PTXdist setup” first).
+Q: I want to backup the source archives my PTXdist project relys on.
+How can I find out what packages my project requires to build?
+A: First build your PTXdist project completely and then run the
+ $ ptxdist export_src <archive directory>
+It copies all archives from where are your source archives stored to
+<archive directory> which can be your backup media.
+Q: To avoid building the OSELAS toolchain on each development host, I
+copied it to another machine. But on this machine I cannot build any
+BSP with this toolchain correctly. All applications on the target are
+failing to start due to missing libraries.
+A: This happens when the toolchain was copied without regarding to
+retain links. There are archive programs around that convert links
+into real files. When you are using such programs to create a
+toolchain archive this toolchain will be broken after extracting it
+again. Solution: Use archive programs that retain links as they are
+(tar for example). Here an example for a broken toolchain:
+ $ ll `find . -name "libcrypt*"`
+ -rwxr-xr-x 1 mkl ptx 55K 2007-07-25 14:54 ./lib/libcrypt-2.5.so*
+ -rwxr-xr-x 1 mkl ptx 55K 2007-07-25 14:54 ./lib/libcrypt.so.1*
+ -rw-r--r-- 1 mkl ptx 63K 2007-07-25 14:54 ./usr/lib/libcrypt.a
+ -rw-r--r-- 1 mkl ptx 64K 2007-07-25 14:54 ./usr/lib/libcrypt_p.a
+ -rwxr-xr-x 1 mkl ptx 55K 2007-07-25 14:54 ./usr/lib/libcrypt.so*
+And in contrast, this one is intact:
+ $ ll `find . -name "libcrypt*"`
+ -rwxr-xr-x 1 mkl ptx 55K 2007-11-03 13:30 ./lib/libcrypt-2.5.so*
+ lrwxrwxrwx 1 mkl ptx 15 2008-02-20 14:52 ./lib/libcrypt.so.1 -> libcrypt-2.5.so*
+ -rw-r--r-- 1 mkl ptx 63K 2007-11-03 13:30 ./usr/lib/libcrypt.a
+ -rw-r--r-- 1 mkl ptx 64K 2007-11-03 13:30 ./usr/lib/libcrypt_p.a
+ lrwxrwxrwx 1 mkl ptx 23 2008-02-20 14:52 ./usr/lib/libcrypt.so -> ../../lib/libcrypt.so.1*
+Q: I followed the instructions how to integrate my own plain source
+project into PTXdist. But when I try to build it, I get:
+ extract: archive=/path/to/my/sources
+ extract: dest=/path/to/my/project/build-target
+ Unknown format, cannot extract!
+But the path exists!
+A: PTXdist interprets a ``file://`` (two slashes) in the URL as a
+project related relative path. So it searches only in the current
+project for the given path. Only ``file:///`` (three slashes) will
+force PTXdist to use the path as an absolute one. This means:
+``file://bla/blub`` will be used as ``./bla/blub`` and
+``file:///friesel/frasel`` as ``/friesel/frasel``.
+Q: I want to use more than one kernel revision in my BSP. How can I
+avoid maintaining one ptxconfig per kernel?
+A: One solution could be to include the kernel revision into the name
+of the kernel config file. Instead of the default kernelconfig.target
+name you should use ``kernelconfig-<revision>.target``. In the kernel
+config file menu entry you should enter
+``kernelconfig-$PTXCONF_KERNEL_VERSION.target``. Whenever you change
+the linux kernel Version menu entry now, this will ensure using a
+different kernel config file, too.
+Q: I’m trying to use a JAVA based package in PTXdist. But compiling
+fails badly. Does it ever work at Pengutronix?
+A: This kind of packages only build correctly when an original SUN VM
+SDK is used. Run PTXdist setup and point the Java SDK menu entry to
+the installation path of your SUN JAVA SDK.
+Q: I made a new project and everythings seems fine. But when I start my
+target with the root filesystem generated by PTXdist, it fails with:
+ cannot run '/etc/init.d/rcS': No such file or directory
+A: The error message is confusing. But this script needs ``/bin/sh`` to
+run. Most of the time this message occures when ``/bin/sh`` does not
+exists. Did you enable it in your busybox configuration?
+Q: I have created a path for my source archives and try to make PTXdist
+use it. But whenever I run PTXdist now it fails with the following error
+ /usr/local/bin/ptxdist: archives: command not found
+A: In this case the path was ``$HOME/source archives`` which includes a
+whitespace in the name of the directory to store the source archives in.
+Handling directory or filenames with whitespaces in applications isn’t
+trivial and also PTXdist suffers all over the place from this issue. The
+only solution is to avoid whitespaces in paths and filenames.
+Q: I have adapted my own rule file’s targetinstall stage, but PTXdist
+does not install the files. A: Check if the closing ``@$(call
+install_finish, [...])`` is present at the end of the targetinsall stage.
+If not, PTXdist will not complete this stage.