On 14/03/2024 13:11, Amrit Anand wrote: > The software packages are shipped with multiple device tree blobs supporting > multiple boards. For instance, suppose we have 3 SoC, each with 4 boards supported, > along with 2 PMIC support for each case which would lead to total of 24 DTB files. > Along with these configurations, OEMs may also add certain additional board variants. > Hence, a mechanism is required to pick the correct DTB for the board on which the > software package is deployed. Introduce a unique property for adding board identifiers > to device trees. Here, board-id property provides a mechanism for Qualcomm based > bootloaders to select the appropriate DTB. > > Isn't that what the compatible property is for? > ----------------------------------------------- > The compatible property can be used for board matching, but requires > bootloaders and/or firmware to maintain a database of possible strings > to match against or have complex compatible string parsing and matching. > Compatible string matching becomes complicated when there are multiple > versions of the same board. It becomes difficult for the device tree > selection mechanism to recognize the right DTB to pick, with minor > differences in compatible strings. > > The solution proposed here is simpler to implement and doesn't require the need > to update bootloader for every new board. One of the concerns you got in v1 was: show us second user, so I believe in your interest is to Cc other platform maintainers which could support this idea. Best regards, Krzysztof
