Messages in this thread | | | Date | Mon, 18 Sep 2006 15:52:14 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: Math-emu kills the kernel on Athlon64 X2 |
| |
On Tue, 19 Sep 2006, Jesper Juhl wrote: > > If I enable the math emulator in 2.6.18-rc7-git2 (only version I've > tried this with) and then boot the kernel with "no387" then I only get > as far as lilo's "...Booting the kernel." message and then the system > hangs.
I'm wondering if it tries to use the MMX/XMM stuff for memcpy and friends.
I'm also wondering why you'd be doing what you seem to try to be doing in the first place ;)
Basically, "no387" doesn't seem to disable any of the fancier FPU features, even though it obviously should. If you ask for math emulation, you'll get emulation faults for _all_ of the modern MMX stuff too (which we don't do).
It's entirely possible that nobody has ever tested this combination.
Linus - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |