kernel.org - master not booting on keystone (ARM v7 Cortex A15 SoC) EVMs

Tue Dec 23 10:17:13 PST 2014

On 12/23/2014 08:13 PM, santosh.shilimkar at oracle.com wrote:
> On 12/23/14 10:05 AM, santosh.shilimkar at oracle.com wrote:
>> +RMK
>>
>> On 12/23/14 9:36 AM, Murali Karicheri wrote:
>>> CC + Santosh (Keystone maintainer)
>>>
>> Thanks Murali !!
>>
>>> On 12/23/2014 09:22 AM, Grygorii.Strashko at linaro.org wrote:
>>>> On 12/22/2014 05:04 PM, Murali Karicheri wrote:
>>>>> On 12/21/2014 05:29 AM, Uwe Kleine-König wrote:
>>>>>> Hello,
>>>>>>
>>>>>> I cannot say anything here, but maybe the people being involved in
>>>>>> 1e6b48116a950 can. I added them to Cc and didn't trim the mail for
>>>>>> them.
>>>>> Uwe,
>>>>>
>>>>> Thanks for copying the commit owners. Looking forward for a response
>>>>> from them.
>>>>>
>>>>> Murali
>>>>>>
>>>>>> Best regards
>>>>>> Uwe
>>>>>>
>>>>>> On Fri, Dec 19, 2014 at 06:48:02PM -0500, Murali Karicheri wrote:
>>>>>>> On 12/19/2014 04:25 PM, Tyler Baker wrote:
>>>>>>>> Hello,
>>>>>>>>
>>>>>>>> On 19 December 2014 at 13:18, Uwe Kleine-König
>>>>>>>> <u.kleine-koenig at pengutronix.de>    wrote:
>>>>>>>>> Hello,
>>>>>>>>>
>>>>>>>>> On Fri, Dec 19, 2014 at 03:55:50PM -0500, Murali Karicheri wrote:
>>>>>>>>>> I have pulled the latest master from
>>>>>>>>>> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>>>>>>>>> and
>>>>>>>>>> tried booting on keystone k2hk and k2e EVM. The boot hangs with
>>>>>>>>>> following log. Has anyone seen this? Keystone is an ARM v7 cortex
>>>>>>>>>> A15 SMP platform. I am assuming master branch is broken for
>>>>>>>>>> ARM v7
>>>>>>>>>> and someone is working to address this. v3.18 booted up fine
>>>>>>>>>> on my
>>>>>>>>>> EVM.
>>>>>>>>>>
>>>>>>>>>> Any idea?
>>>>>>>>> You forgot to attach the log?! So no, I don't have any idea. Did
>>>>>>>>> you
>>>>>>>>> bisect?
>>>>>>>
>>>>>>> This was my first git bisect work. git bisect showed me below commit
>>>>>>> as bad commit. But it is pretty old commit. I tried reverting the
>>>>>>> commit and my board booted up fine. The boot log attached below. I
>>>>>>> did following until I got the bad commit. v3.18 also worked fine.
>>>>>>>
>>>>>>> git bisect start
>>>>>>> git bisect good<working commit>
>>>>>>> git bisect bad<non working commit>
>>>>>>>
>>>>>>> I build and test. If boots fine, I did git bisect good and if not,
>>>>>>> git bisect bad until I got the bad commit. Can someone comment if my
>>>>>>> bisect steps look sane? If so, what is wrong with the below commit?
>>>>>>> Ours is a LPAE SoC.
>>>>>>>
>>>>>>> commit 1e6b48116a95046ec51f3d40f83aff8b006674d7
>>>>>>> Author: Kees Cook<keescook at chromium.org>
>>>>>>> Date:   Thu Apr 3 17:28:11 2014 -0700
>>>>>>>
>>>>>>>       ARM: mm: allow non-text sections to be non-executable
>>>>>>>
>>>>>>>       Adds CONFIG_ARM_KERNMEM_PERMS to separate the kernel memory
>>>>>>> regions
>>>>>>>       into section-sized areas that can have different permisions.
>>>>>>> Performs
>>>>>>>       the NX permission changes during free_initmem, so that init
>>>>>>> memory can be
>>>>>>>       reclaimed.
>>>>>>>
>>>>>>>       This uses section size instead of PMD size to reduce memory
>>>>>>> lost to
>>>>>>>       padding on non-LPAE systems.
>>>>>>>
>>>>>>>       Based on work by Brad Spengler, Larry Bassel, and Laura
>>>>>>> Abbott.
>>>>>>>
>>>>>>>       Signed-off-by: Kees Cook<keescook at chromium.org>
>>>>>>>       Tested-by: Laura Abbott<lauraa at codeaurora.org>
>>>>>>>       Acked-by: Nicolas Pitre<nico at linaro.org>
>>>>>>>
>>>>
>>>> Looks like kernel_x_start, kernel_x_end are calculated wrongly in LPAE
>>>> case.
>>>> kernel_x_start == 0x0000 0000
>>>> kernel_x_end   == 0x0080 0000
>>>>
>>>> but should be:
>>>> kernel_x_start == 0x0000 0008 0000 0000
>>>> kernel_x_end   == 0x0000 0008 0080 0000
>>>>
>>>> Below diff restores boot for me:
>>>>
>>>> diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
>>>> index cda7c40..4e6ef89 100644
>>>> --- a/arch/arm/mm/mmu.c
>>>> +++ b/arch/arm/mm/mmu.c
>>>> @@ -1329,8 +1329,8 @@ static void __init kmap_init(void)
>>>>   static void __init map_lowmem(void)
>>>>   {
>>>>          struct memblock_region *reg;
>>>> -       unsigned long kernel_x_start = round_down(__pa(_stext),
>>>> SECTION_SIZE);
>>>> -       unsigned long kernel_x_end = round_up(__pa(__init_end),
>>>> SECTION_SIZE);
>>>> +       phys_addr_t kernel_x_start = round_down(__pa(_stext),
>>>> SECTION_SIZE);
>>>> +       phys_addr_t kernel_x_end = round_up(__pa(__init_end),
>>>> SECTION_SIZE);
>>>>
>>>>          /* Map all the lowmem memory banks. */
>>>>          for_each_memblock(memory, reg) {
>>>
>> Uwe,
> Sorry Uwe !!
> I mean to ask this question to Nicolas and RMK.
>
>> The fix looks straight forward to me. Can you please comment if you
>> think otherwise.
>>
>
> Grygorii,
> Can you please add the formatted patch to RMK's patch system ?
>

Ok. I will try - I've never done it before.

-- 
regards,
-grygorii