Bug#464962: immediate crash on boot on TM5800

["H. Peter Anvin" <hpa@zytor.com>]

Bastian Blank wrote:
> On Tue, Feb 12, 2008 at 01:42:50PM -0800, H. Peter Anvin wrote:
> > Okay, the faulting instruction is the following:
> > c0383360:       0f 1f 40 00             nopl   0x0(%eax)
>
> include/asm-x86/nops.h:
> | /* P6 nops */
> | /* uses eax dependencies (Intel-recommended choice) */
> [...]
> | #define P6_NOP4 ".byte 0x0f,0x1f,0x40,0\n"

Yes, which requires a 686-class machine; gcc is also free to use these 
for -m686, so there is a userspace-visible difference, and thus the hack 
to call Crusoe a 686-class machine is not correct.

Unfortunately there is no CPUID flag for these, only the CPU level.

	-hpa