X-Git-Url: https://review.fuel-infra.org/gitweb?a=blobdiff_plain;f=cirros-testvm%2Fsrc-cirros%2Fbuildroot-2015.05%2Fbuild%2Fdocs%2Fmanual%2Fusing-buildroot-debugger.txt;fp=cirros-testvm%2Fsrc-cirros%2Fbuildroot-2015.05%2Fbuild%2Fdocs%2Fmanual%2Fusing-buildroot-debugger.txt;h=b5063ca94c176c1198aa44ecd2c4d0ee558c7870;hb=b0a0f15dfaa205161a7fcb20cf1b8cd4948c2ef3;hp=0000000000000000000000000000000000000000;hpb=c6ac3cd55ee2da956195eee393b0882105dfad4e;p=packages%2Ftrusty%2Fcirros-testvm.git

diff --git a/cirros-testvm/src-cirros/buildroot-2015.05/build/docs/manual/using-buildroot-debugger.txt b/cirros-testvm/src-cirros/buildroot-2015.05/build/docs/manual/using-buildroot-debugger.txt
new file mode 100644
index 0000000..b5063ca
--- /dev/null
+++ b/cirros-testvm/src-cirros/buildroot-2015.05/build/docs/manual/using-buildroot-debugger.txt
@@ -0,0 +1,53 @@
+// -*- mode:doc; -*-
+// vim: set syntax=asciidoc:
+
+==== Using +gdb+ in Buildroot
+
+Buildroot allows to do cross-debugging, where the debugger runs on the
+build machine and communicates with +gdbserver+ on the target to
+control the execution of the program.
+
+To achieve this:
+
+* If you are using an _internal toolchain_ (built by Buildroot), you
+  must enable +BR2_PACKAGE_HOST_GDB+, +BR2_PACKAGE_GDB+ and
+  +BR2_PACKAGE_GDB_SERVER+. This ensures that both the cross gdb and
+  gdbserver get built, and that gdbserver gets installed to your target.
+
+* If you are using an _external toolchain_, you should enable
+  +BR2_TOOLCHAIN_EXTERNAL_GDB_SERVER_COPY+, which will copy the
+  gdbserver included with the external toolchain to the target. If your
+  external toolchain does not have a cross gdb or gdbserver, it is also
+  possible to let Buildroot build them, by enabling the same options as
+  for the _internal toolchain backend_.
+
+Now, to start debugging a program called +foo+, you should run on the
+target:
+
+----------------------------
+gdbserver :2345 foo
+----------------------------
+
+This will cause +gdbserver+ to listen on TCP port 2345 for a connection
+from the cross gdb.
+
+Then, on the host, you should start the cross gdb using the following
+command line:
+
+----------------------------
+<buildroot>/output/host/usr/bin/<tuple>-gdb -x <buildroot>/output/staging/usr/share/buildroot/gdbinit foo
+----------------------------
+
+Of course, +foo+ must be available in the current directory, built
+with debugging symbols. Typically you start this command from the
+directory where +foo+ is built (and not from +output/target/+ as the
+binaries in that directory are stripped).
+
+The +<buildroot>/output/staging/usr/share/buildroot/gdbinit+ file will tell the
+cross gdb where to find the libraries of the target.
+
+Finally, to connect to the target from the cross gdb:
+
+----------------------------
+(gdb) target remote <target ip address>:2345
+----------------------------