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