[PATCH 0/2] Enable private ATF handoff structure

[Marek Vasut]

On 1/16/20 10:42 AM, Michal Simek wrote:
> On 16. 01. 20 10:10, Marek Vasut wrote:
>> On 1/16/20 8:25 AM, Michal Simek wrote:
>>> čt 19. 12. 2019 v 18:32 odesílatel Michal Simek
>>> <michal.simek at xilinx.com> napsal:
>>>>
>>>> Hi,
>>>>
>>>> Xilinx ZynqMP platform is using from the beggining specific structure which
>>>> is passed from FSBL/SPL to ATF.
>>>> Maybe in future both options can be supported by ATF and we can remove this
>>>> private structure completely. But as of now bl31_params are completely
>>>> ignored by ATF by RESET_TO_BL31=1 build flag.
>>>>
>>>> Thanks,
>>>> Michal
>>>>
>>>>
>>>> Michal Simek (2):
>>>>   spl: atf: Enable option to rewrite bl2_plat_get_bl31_params()
>>>>   arm: zynqmp: Wire SPL/ATF handoff structure properly
>>>>
>>>>  arch/arm/mach-zynqmp/handoff.c                | 17 +++++++++++-----
>>>>  arch/arm/mach-zynqmp/include/mach/sys_proto.h |  2 --
>>>>  arch/arm/mach-zynqmp/spl.c                    |  2 --
>>>>  common/spl/spl_atf.c                          | 15 +-------------
>>>>  include/spl.h                                 | 20 +++++++++++++++++++
>>>>  5 files changed, 33 insertions(+), 23 deletions(-)
>>>>
>>>> --
>>>> 2.24.0
>>>>
>>>
>>> Applied.
>>
>> Can't you rather pass DT around ?
>>
> 
> Unfortunately not. The best will be just update ATF to support standard
> method how to get information but that means that we break all backward
> compatibility and nothing will work.

Isn't that what Xilinx does with their ABI between all BSP versions ?
The only stable thing is the ABI version, which never changes :-)

> Xilinx handoff structure is around fro quite a long time and that's
> something I need to unfortunately live with.

Maybe you can develop a better method (DT) in parallel and slowly switch
over then ?