On Sun, Jun 17, 2012 at 05:25:08PM +0430, ali hagigat wrote: > I think SMI needs some initialization from BIOS and then Linux kernel. > The Linux kernel has some CONFIG_ variables to disable/enable SMI. > In theory a motherboard can be built to generate SMI without the > software help. But I think OEMs do not build such a board. So I think > an x86 PC hard real time system is possible for today's PCs. > > Please correct me if I am wrong.
The majority of systems I have seen do have SMI enabled at all times and no way to turn it off. IBM even released a kernel driver to allow linux users to disable SMI on some xSeries servers, but they must also handle certain fan controllers from linux in that case since the SMI BIOS code is no longer doing it. For those doing real time, this is acceptable to have to do, certainly much better than having the SMI BIOS code interrupting real time just to check on the fans. I do not believe linux has any way to turn it off. It is rather system specific. All I see is CONFIG_GOOGLE_SMI which is specific to google's machines. Also CONFIG_IBM_RTL (IBM Premium Real Time Mode). -- Len Sorensen _______________________________________________ Xenomai mailing list [email protected] http://www.xenomai.org/mailman/listinfo/xenomai
