[poky] [PATCH] genericx86: tune for i586 instead of atom

[Bruce Ashfield]

On Tue, Sep 3, 2013 at 11:30 PM, Jonathan Liu <net147 at gmail.com> wrote:
> Hi Bruce,
>
> The kernel output is the following:
> Loading /vmlinuz.........ready.
> This kernel requires the following features not present on the CPU:
> movbe
> Unable to boot - please use a kernel appropriate for your CPU.
>
> It stops at that stage and the kernel doesn't boot at all. I started
> having this issue after switching my BSP to Linux 3.10.

I take it your BSP is based on the genericx86 BSP/configuration ? The entire
kernel build is done with:

oe_runmake ${KERNEL_IMAGETYPE_FOR_MAKE} ${KERNEL_ALT_IMAGETYPE}
CC="${KERNEL_CC}" LD="${KERNEL_LD}" ${KERNEL_EXTRA_ARGS}

And unless you've put something in KERNEL_EXTRA_ARGS, that means
the kernel configuration and its own Makefiles determine all compile flags and
optimizations.

So switching that config file should have no impact on the build.

To confirm .. you are saying after that change you can boot again ? Best to
hear from Darren/Tom or Ross on this one.

Bruce

>
> Regards,
> Jonathan
>
> On 4 September 2013 13:23, Bruce Ashfield <bruce.ashfield at gmail.com> wrote:
>> On Tue, Sep 3, 2013 at 9:43 PM, Jonathan Liu <net147 at gmail.com> wrote:
>>> Tuning for Intel Atom CPU can in result instructions being used that are
>>> not compatible with older x86 CPUs such as Intel Pentium Dual-Core
>>> E2200. This can result in Linux 3.10 failing to boot with:
>>> "This kernel requires the following features not present on the CPU:
>>> movbe
>>> Unable to boot - please use a kernel appropriate for your CPU.".
>>
>> That's a bit surprising, do you have a bootlog to share ? This tune
>> file shouldn't
>> impact the kernel build options, and if it is, that's a bug.
>>
>> If the error shows up on the switch to userspace, then that's a different story.
>>
>> Bruce
>>
>>>
>>> Signed-off-by: Jonathan Liu <net147 at gmail.com>
>>> ---
>>>  meta-yocto-bsp/conf/machine/genericx86.conf | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/meta-yocto-bsp/conf/machine/genericx86.conf b/meta-yocto-bsp/conf/machine/genericx86.conf
>>> index ff5cbc9..f5d9cd5 100644
>>> --- a/meta-yocto-bsp/conf/machine/genericx86.conf
>>> +++ b/meta-yocto-bsp/conf/machine/genericx86.conf
>>> @@ -3,7 +3,7 @@
>>>
>>>  #@DESCRIPTION: Machine configuration for generic X86 (32-bit) PCs. Supports a moderately wide range of drivers that should boot and be usable on "typical" hardware.
>>>
>>> -include conf/machine/include/tune-atom.inc
>>> +include conf/machine/include/tune-i586.inc
>>>
>>>  MACHINE_FEATURES = "screen keyboard pci usbhost ext2 ext3 x86 wifi acpi alsa"
>>>
>>> --
>>> 1.8.4
>>>
>>> _______________________________________________
>>> poky mailing list
>>> poky at yoctoproject.org
>>> https://lists.yoctoproject.org/listinfo/poky
>>
>>
>>
>> --
>> "Thou shalt not follow the NULL pointer, for chaos and madness await
>> thee at its end"



-- 
"Thou shalt not follow the NULL pointer, for chaos and madness await
thee at its end"