* DTB_RESELECT/MULTI DTB with SPL flow
@ 2021-06-11 13:56 Michal Simek
2021-06-26 18:30 ` Simon Glass
0 siblings, 1 reply; 3+ messages in thread
From: Michal Simek @ 2021-06-11 13:56 UTC (permalink / raw)
To: U-Boot Mailing List, Simon Glass
Hi,
I am just trying to wrap my head around DTB_RESELECT feature.
ZynqMP is using u-boot.itb which is u-boot/atf + a lot of DT files.
As of now SPL should pick the right one load it predefined location
which U-Boot proper pickup.
Others DTBs are not loaded at all.
This is working fine and I expect it should work like this even with
DTB_RESELECT enabled because you need to have base DTB for being able to
do platform detection.
I have hookup platform detection in embedded_dtb_select and I know which
board revision I am running at and struggling how to tell u-boot what to do.
What should be the right flow for changing DTB at run time?
Where they should be stored? I would expect that I need to have FIT
image in memory for all board revisions and u-boot should be calling
board_fit_config_name_match() which will decide which DT is correct
based on board detection done in embedded_dtb_select().
Thanks,
Michal
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: DTB_RESELECT/MULTI DTB with SPL flow
2021-06-11 13:56 DTB_RESELECT/MULTI DTB with SPL flow Michal Simek
@ 2021-06-26 18:30 ` Simon Glass
2021-06-28 7:14 ` Michal Simek
0 siblings, 1 reply; 3+ messages in thread
From: Simon Glass @ 2021-06-26 18:30 UTC (permalink / raw)
To: Michal Simek; +Cc: U-Boot Mailing List
Hi Michal,
On Fri, 11 Jun 2021 at 07:56, Michal Simek <michal.simek@xilinx.com> wrote:
>
> Hi,
>
> I am just trying to wrap my head around DTB_RESELECT feature.
Did you intend to cc the author of that?
Does doc/README.multi-dtb-fit help?
> ZynqMP is using u-boot.itb which is u-boot/atf + a lot of DT files.
> As of now SPL should pick the right one load it predefined location
> which U-Boot proper pickup.
> Others DTBs are not loaded at all.
> This is working fine and I expect it should work like this even with
> DTB_RESELECT enabled because you need to have base DTB for being able to
> do platform detection.
> I have hookup platform detection in embedded_dtb_select and I know which
> board revision I am running at and struggling how to tell u-boot what to do.
>
> What should be the right flow for changing DTB at run time?
> Where they should be stored? I would expect that I need to have FIT
> image in memory for all board revisions and u-boot should be calling
> board_fit_config_name_match() which will decide which DT is correct
> based on board detection done in embedded_dtb_select().
Yes you can use a FIT to hold the DTs. You can also use binman I
suppose (the 'files' entry type perhaps).
Regards,
Simon
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: DTB_RESELECT/MULTI DTB with SPL flow
2021-06-26 18:30 ` Simon Glass
@ 2021-06-28 7:14 ` Michal Simek
0 siblings, 0 replies; 3+ messages in thread
From: Michal Simek @ 2021-06-28 7:14 UTC (permalink / raw)
To: Simon Glass, Michal Simek
Cc: U-Boot Mailing List, Fabio Estevam, Jean-Jacques Hiblot
Hi Simon,
On 6/26/21 8:30 PM, Simon Glass wrote:
> Hi Michal,
>
> On Fri, 11 Jun 2021 at 07:56, Michal Simek <michal.simek@xilinx.com> wrote:
>>
>> Hi,
>>
>> I am just trying to wrap my head around DTB_RESELECT feature.
>
> Did you intend to cc the author of that?
>
> Does doc/README.multi-dtb-fit help?
>
>> ZynqMP is using u-boot.itb which is u-boot/atf + a lot of DT files.
>> As of now SPL should pick the right one load it predefined location
>> which U-Boot proper pickup.
>> Others DTBs are not loaded at all.
>> This is working fine and I expect it should work like this even with
>> DTB_RESELECT enabled because you need to have base DTB for being able to
>> do platform detection.
>> I have hookup platform detection in embedded_dtb_select and I know which
>> board revision I am running at and struggling how to tell u-boot what to do.
>>
>> What should be the right flow for changing DTB at run time?
>> Where they should be stored? I would expect that I need to have FIT
>> image in memory for all board revisions and u-boot should be calling
>> board_fit_config_name_match() which will decide which DT is correct
>> based on board detection done in embedded_dtb_select().
>
> Yes you can use a FIT to hold the DTs. You can also use binman I
> suppose (the 'files' entry type perhaps).
I got it working. Also found one alignment issue which needs to be
fixed. And also DT overlays are not supported now.
Thanks,
Michal
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2021-06-28 7:15 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2021-06-11 13:56 DTB_RESELECT/MULTI DTB with SPL flow Michal Simek
2021-06-26 18:30 ` Simon Glass
2021-06-28 7:14 ` Michal Simek
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