add eclipse and preempt-rt notes

These are notes that may be helpful for trainers when preparing
for a schulung.

Signed-off-by: John Ogness <john.ogness@linutronix.de>

2 files changed, 93 insertions, 0 deletions

diff --git a/schulung_tools/notes/HOWTO-eclipse-cross-remote.txt b/schulung_tools/notes/HOWTO-eclipse-cross-remote.txt
new file mode 100644
index 0000000..45c8d02
--- /dev/null
+++ b/schulung_tools/notes/HOWTO-eclipse-cross-remote.txt
@@ -0,0 +1,43 @@
+(setup cross project)
+File -> New -> C Project
+"C Project" window
+    Project name: hello
+    Project type: Hello World ANSI C Project
+    Toolchains: Cross GCC
+"Basic Settings" window
+    (author, copyright, ...)
+"Select Configurations" window
+    Debug, Release
+"Cross GCC Command" window
+    Cross compiler prefix: arm-linux-gnueabihf-
+    Cross compiler path: /opt/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin
+
+(modify existing project)
+Project -> Properties
+C/C++ Build -> Settings
+
+(setup debug)
+Run -> Debug Configurations
+"Create, manage, and run configurations" window
+    select "C/C++ Remote Application" and click "New" icon
+"Main" tab
+    Connection: New...
+"Create a new connection" window
+    Connection type: SSH
+"New Connection" window
+    Connection name: qemu-arm
+    Host: localhost
+    User: root
+    Password based authentication
+    Password: root
+    Advanced
+        Port: 2222
+        Use login shell
+        Login shell command: /bin/sh -c '{0}'
+"Main" tab
+    Remote Abolsute File Path for C/C++ Application: /hello
+"Debugger" tab
+    "Main" sub-tab
+        GDB debugger: /opt/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-gdb
+    "Gdbserver Settings" sub-tab
+        Port number: 12345
diff --git a/schulung_tools/notes/preempt-rt-tips.txt b/schulung_tools/notes/preempt-rt-tips.txt
new file mode 100644
index 0000000..89b4204
--- /dev/null
+++ b/schulung_tools/notes/preempt-rt-tips.txt
@@ -0,0 +1,50 @@
+# download 4.14 kernel
+wget --continue https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.14.tar.xz
+
+# download 4.14 -> 4.14.27 stable kernel patch
+wget --continue https://cdn.kernel.org/pub/linux/kernel/v4.x/patch-4.14.27.xz
+
+# download 4.14.27 -> 4.14.27-rt21 realtime kernel patch
+wget --continue https://www.kernel.org/pub/linux/kernel/projects/rt/4.14/older/patch-4.14.27-rt21.patch.xz
+
+# unpack 4.14 kernel
+tar xJf linux-4.14.tar.xz
+
+# apply 4.14.27 stable kernel patch
+xzcat patch-4.14.27.xz | patch -p 1 -d linux-4.14
+
+# apply 4.14.27-rt21 realtime kernel patch
+xzcat patch-4.14.27-rt21.patch.xz | patch -p 1 -d linux-4.14
+
+
+#
+# kernel options to be aware of
+#
+# (must be set to activate all realtime features)
+# CONFIG_PREEMPT_RT_FULL
+#
+# (disable prio99 watchdog debug tasks, unless really needed/wanted)
+# CONFIG_LOCKUP_DETECTOR
+# CONFIG_DETECT_HUNG_TASK
+#
+# (reduced power, but greater latencies, disable it)
+# (use CONFIG_100_HZ and CONFIG_HZ_PERIODIC instead)
+# CONFIG_NO_HZ
+#
+# (additional NOPs inserted to each function, ok to enable so you have ftrace)
+# CONFIG_FTRACE
+#
+# (reduced power, but greater latencies, disable appropriately)
+# CONFIG_CPU_IDLE
+#
+# (may cause very large overheads and latencies, disable appropriately)
+# CONFIG_DEBUG_*
+#
+# (make sure these are enabled, but only use "performance")
+# CONFIG_CPU_FREQ_GOV_*
+# CONFIG_CPU_FREQ_DEFAULT_*
+#
+# (causes unnecessary processing, for systems that do not need it,
+#  disable if not needed)
+# CONFIG_HIGHMEM
+#