I have a problem with long beep at sturtup of new UpBoards. We used many of them and there was no beep at device startup. I think it's some change. How to turn off this sound? It's not proper for some projects.
Can you please provide the exact model number and revision of your board?
I don' t know now - our customer has all this boards built in our devices, so rather will not check . Anyway the problem is about one PIN - there should be some change on this and thats because this there's a signal at devices startup what's causes long beep via our buzzer. Did anything changed last time with UP pin 4 / Linux pin 27?
I don't understand what you mean by last time.
If I don't know what specific UP (is it UP Board, UP Squared, else?) or hardware revision you are mentioning (at this moment there is UP A1.0 and UP A1.1), what BIOS version, what Linux OS and Kernel and what settings, it is not possible to say much.
From our side I can tell you that the Linux Kernel drivers we developed for UP has the same behaviour and it has been tested on all the revisions.
From the hardware side these are the changes for UP Board on A1.1: