Moved board-related stuff in board subdirectory

board/libs/library/datasheet/BM23/notes.md

@@ -0,0 +1,30 @@
+I2S connection to PCM5102A module:
+
+BM23    PCM5102A module
+
+RFS0 -> LCK
+
+SLK0 -> BCK
+
+DI0  -> DIN
+
+GND  -> GND,FMT
+
+ADAP_IN -> VCC
+
+unmute: connect 3V3 to XMT
+
+EEPROM PATCH:
+
+use IS2023_203_Merge_0F1B.bin
+
+from this bin these files musy be applied, if not module will restart after playing song starts:
+
+BM23_203_AFHIJKLMP.txt
+
+
+this one need to be tested if it can be avoided:
+
+BM23_203_DSP_new.txt
+
+also module is strangly loud