Hi Some time ago I managed to upstream one bugfix, now I have more changes but I'm wondering how to approach this. Suppose that I have found a bug and prepared a fix. However, the bug and its solution has been found and tested on a custom board that is equipped with a particular buggy device. The problem is that I cannot simply use mainline/maintainer tree, build it, and run on my board as these source trees do not have support for my board, as I use SoC vendor fork (v6.12) supplied with their bsp with patches that add support for my board. It's not mine decision - obviously - me and my team would be very willing to use mainline but it would require some effort, time and obviously we would not get vendor support in case of some bugs (it happened mamy times). I can of course take the minimal set of patches for out board and apply them over mainline but e.g. now I have a bugfix for mainline driver...but in order to fully test it I need vendor changes as they did not upstream it yet. So at the end in order to test a bugfix on the mainline I would need to apply patches that add support for my board as well patches from vendor fork that add support for the rest of the functionality (not yet upstreamed by vendor) that I need in order to test the bugfix. Any sugestion on how to approach this? I have already few changes that could be applied to mainline but due to what I described above they're just waiting... Will be grateful for some sugestion. Best regards Patryk