Very Basic question : At first connection the board LPC55S69-EVK is not recognized when connecting it to the PC through "Debug probe" USB connector : Windows tells the driver for the board is not found. I could not find indication in documentation that such driver should be uploaded ? It looks strange since no one on the forum seems to have had this issue. Note that on this same USB port of the PC , I have some times ago connected other type of NXP EVK board and it worked properly without having any specific driver to load. NB : of course I have loaded the board SDK beforehand.
Well, I reply to this one myself ! you HAVE TO load and install MCUXpressoIDE even if you use other IDEs (IAR in my case). This is not intuitive and should be indicated somewhere in the getting started page. Best regards.