Module: xenomai-2.6
Branch: master
Commit: c4d2d0f04a1c11d84d9ed1b21cd10bd3f8805fd0

Author: Philippe Gerum <>
Date:   Wed Dec 26 15:28:00 2012 +0100

doc/x86: mention lack of xsave support


 doc/asciidoc/TROUBLESHOOTING.adoc |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/doc/asciidoc/TROUBLESHOOTING.adoc 
index 9f3f986..7ed01d6 100644
--- a/doc/asciidoc/TROUBLESHOOTING.adoc
+++ b/doc/asciidoc/TROUBLESHOOTING.adoc
@@ -583,6 +583,25 @@ options +CONFIG_XENO_OPT_SYS_HEAPSZ+ and
 should be configured to large enough values. Try increasing them and
 recompiling the kernel.
+Known Bugs and Limitations
+2.6.2 (like any previous Xenomai release) does not handle the extended
+processor state (xsave/xrstor) yet.
+2.6.2 automatically disables this CPU feature at boot when the host
+kernel detects it, so no action is to be taken by the user. However,
+this feature shall be disabled manually for older Xenomai releases, by
+passing the "noxsave" parameter on the kernel command line (see
+Failing to do so, running with extended processor state support
+enabled on these Xenomai releases beget random execution errors in
+userland, typically when the switchtest program runs in the
+background, due to incorrect FPU management in real-time mode.
 Problem with my code (not Xenomai code)

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