[U-Boot] [PATCH] spl: atf: fix the plat_params

[Kever Yang <kever.yang@rock-chips.com>]

Hi Philipp,

     I have ask Rockchip ATF maintainers to update both internal and 
upstream

ATF to support the pointer to FDT for plat_params.

     But I really hope people don't break the software already in 
use/upstream

so easily, we need to update every related module in stead of break others.

Or else people would not like to use source code from U-Boot upstream.


Thanks,
- Kever
On 12/19/2017 10:03 AM, Kever Yang wrote:
> Hi Philipp,
>
>
> On 12/15/2017 05:07 PM, Dr. Philipp Tomsich wrote:
>> Kever,
>>
>> If you need/want to disable this, could you make this conditional on 
>> a new
>> Kconfig option?  That way we can disable it for those boards that 
>> still ship
>> with an old ATF
>
> That's not an "old" ATF, it's the latest upstream version and wildly 
> used by all
> the open source community. Many people get from upstream first, and then
> other forks.
>> (note that passing NULL also broke the upstream ATF for
>> quite a number of versions…).
>
> A NULL pointer means no parameter for plat_params, and it will not 
> broke upstream ATF.
>
> Well, what make me crazy is that every time I update a version from 
> upstream U-Boot,
> I have to debug for different issues on different boards:(
>
>> Alternatively, you could add a board-specific wrapper function that 
>> allows
>> modifying the parameters (as they are plat_params, anyway), e.g.:
>>     atf_entry((void *)bl31_params, board_atf_plat_params(fdt_addr))
>>
>> This would allow you to suppress this for boards that are known to ship
>> with a ATF that does not yet support this.
>
> We should do this before previous patch, right?
>>
>> Note that the ATF shipped by us has already been updated, so we can’t
>> just remove this as it will break functionality for people in the 
>> field...
>
> You customer should get a complete version with all functionality work 
> from your
> server, right? It's not totally the same as the upstream version, just 
> like Rockchip have
> a version on github for evbs, which have been test by our QA.
>
> BUT, open source community always get a BROKEN version from upstream :(
> The upstream source code should have a good support for the boards 
> already upstream,
> but it broken very frequently.
>
> Thanks,
> - Kever
>>
>> Thanks,
>> Philipp.
>>
>>> On 15 Dec 2017, at 04:27, Kever Yang <kever.yang@rock-chips.com> wrote:
>>>
>>> The latest upstream ATF still not support using a fdt base as 
>>> plat_params,
>>> I get error like this:
>>> "ERROR:   not expected type found 6410029648624618960"
>>>
>>> The reason is the ATF source code parse the plat_param, and can not
>>> decode the type in:
>>> /* common header for all plat parameter type */
>>> struct bl31_plat_param {
>>>     uint64_t type;
>>>     void *next;
>>> };
>>> void params_early_setup(void *plat_param_from_bl2)
>>> plat/rockchip/common/params_setup.c
>>>
>>> We can only use the fdt_addr as plat_params after upstream ATF able to
>>> parse it.
>>>
>>> BUGFIX to:
>>> 1d37909 spl: atf: introduce spl_invoke_atf and make bl31_entry private
>>>
>>> Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
>>> ---
>>>
>>> common/spl/spl_atf.c | 2 +-
>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/common/spl/spl_atf.c b/common/spl/spl_atf.c
>>> index 63557c0..a65d603 100644
>>> --- a/common/spl/spl_atf.c
>>> +++ b/common/spl/spl_atf.c
>>> @@ -96,7 +96,7 @@ static void bl31_entry(uintptr_t bl31_entry, 
>>> uintptr_t bl33_entry,
>>>     raw_write_daif(SPSR_EXCEPTION_MASK);
>>>     dcache_disable();
>>>
>>> -    atf_entry((void *)bl31_params, (void *)fdt_addr);
>>> +    atf_entry((void *)bl31_params, NULL);
>>> }
>>>
>>> static int spl_fit_images_find_uboot(void *blob)
>>> -- 
>>> 1.9.1
>>>
>>
>
>
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