[U-Boot] [PATCH] board_f: skip timer_init() on Coldfire archs

[Simon Glass]

Hi Angelo,

On 10 May 2017 at 16:36, Angelo Dureghello <angelo at sysam.it> wrote:
> Hi Simon,
>
>
> On 11/05/2017 00:03, Simon Glass wrote:
>>
>> Hi Angelo,
>>
>> On 10 May 2017 at 15:58, Angelo Dureghello <angelo at sysam.it> wrote:
>>>
>>> Coldfire arch is not happy with timer_init since interrupt handlers
>>> are still not set at that stage, and the boot hangs silently.
>>>
>>> Signed-off-by: Angelo Dureghello <angelo at sysam.it>
>>> ---
>>>  common/board_f.c | 2 ++
>>>  1 file changed, 2 insertions(+)
>>>
>>> diff --git a/common/board_f.c b/common/board_f.c
>>> index d9431ee79a..30e588e213 100644
>>> --- a/common/board_f.c
>>> +++ b/common/board_f.c
>>> @@ -740,7 +740,9 @@ static const init_fnc_t init_sequence_f[] = {
>>>         /* get CPU and bus clocks according to the environment variable
>>> */
>>>         get_clocks,             /* get CPU and bus clocks (etc.) */
>>>  #endif
>>> +#if !defined(CONFIG_M68K)
>>>         timer_init,             /* initialize timer */
>>> +#endif
>>>  #if defined(CONFIG_BOARD_POSTCLK_INIT)
>>>         board_postclk_init,
>>>  #endif
>>> --
>>> 2.11.0
>>>
>>
>> I'm really hoping we can get rid of all arch-specific things from the
>> init sequence.
>>
>
> Yes, i have seen you unified that step for all archs, and unfortunately i
> discovered the issue now only updating u-boot on my mcf5307 based board.
>
>> Is there no way that m68k can init its timer here? Or perhaps it could
>> be a nop function?
>
>
> I checked now all the cpu/xxx/start.S. At that early stage, all the
> vector handlers are set to _fault thats is just and endless loop.
>
> In Coldfire arch, timer_init() is implemented in lib/time.c, as to
> setup and start the system timer overflow interrupt. It is called later
> from board_init_r(), line 863, after interrupt_init().
>
> So, no :( unless you don't have some suggestion, i don't see any easy
> way to keep that timer_init() call enabled in board_init_f().

My only ideas are:

- user driver model for timer and then call the interrupt init from
your driver's probe() method
- make timer_init() a nop for you arch

Regards,
Simon