Hello,
I try to install a real-time Linux kernel on a Roboard based on a Vortex86DX
(a x486 with TSC).
All works fine with :
Linux Kernel 2.6.30.10
Xenomai 2.5.1
Adeos patch adeos-ipipe-2.6.30.8-x86-2.4-09.patch
But, for all kernels upper or equal to 2.6.31, I always get a double fault
when testing WP bit. I have this double fault just after that :
*Checking if this processor honours the WP bit even in supervisor mode...*
I traced with some simple printk that the problem occurs in this function,
at the end or after the call of fix_to_virt :
*static noinline int do_test_wp_bit(void)
{
char tmp_reg;
int flag;
__asm__ __volatile__(
" movb %0, %1 \n"
"1: movb %1, %0 \n"
" xorl %2, %2 \n"
"2: \n"
_ASM_EXTABLE(1b,2b)
:"=m" (*(char *)fix_to_virt(FIX_WP_TEST)),
"=q" (tmp_reg),
"=r" (flag)
:"2" (1)
:"memory");
return flag;
}*
I'm (quasi) sure that the problem is not that function, due to it works when
the kernel is not patched.
But where should I search ?
Can you give me some indications ?
Thanks,
Gilles
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