Jan Kiszka wrote:
> Gilles DOFFE wrote:
>> 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 ?
>
> Does applying this patch [1] happen to change the picture?To answer myself: As the Vortex is 32-bit, this patch cannot make a difference. > > If not, please provide your .config. So this is now important. Probably reproducible in a VM, thus also easily debuggable. Jan
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