Merge #19333 #19334

19333: Makefile.features: output board on error r=maribu a=benpicco



19334: boards/common/blxxxpill: Update pinout r=maribu a=maribu

### Contribution description

Also document the OSC32 connection of PC14/PC15 in the pinout.

### Testing procedure

Check the generated doc; or check the SVG updated by this PR (Github does have a nice SVG viewer inline that can show old and new versions side by side).

### Issues/PRs references

None

Co-authored-by: Benjamin Valentin <benjamin.valentin@ml-pa.com>
Co-authored-by: Marian Buschsieweke <marian.buschsieweke@ovgu.de>

Makefile.features

@@ -13,7 +13,7 @@ include $(BOARDDIR)/Makefile.features
 
 # Sanity check
 ifeq (,$(CPU))
-  $(error CPU must be defined by board / board_common Makefile.features)
+  $(error $(BOARD): CPU must be defined by board / board_common Makefile.features)
 endif
 
 include $(RIOTCPU)/$(CPU)/Makefile.features

boards/common/blxxxpill/doc/pinout-bluepill.csv

@@ -77,8 +77,8 @@ PINSET, LEFT, PACKED, CENTER, CENTER, 74.75, 30, 45, 60, 10, 0
 #           wire,       type,   group,  pin-name,   comment,    analog, PWM,    SPI,    I2C,    POWER,  UART,   QDEC
 PIN,        ANALOG,     INPUT,  NONE,   ,           "VAT"
 PIN,        DIGITAL,    OUTPUT, NONE,   "PC 13",    "LED1"
-PIN,        DIGITAL,    IO,     NONE,   "PC 14"
-PIN,        DIGITAL,    IO,     NONE,   "PC 15"
+PIN,        DIGITAL,    IO,     NONE,   "PC 14",    "OSC32"
+PIN,        DIGITAL,    IO,     NONE,   "PC 15",    "OSC32"
 PIN,        ANALOG,     IO,     NONE,   "PA 0",     ,           "A0"
 PIN,        DIGITAL,    IO,     NONE,   "PA 1",     ,           "A1"
 PIN,        DIGITAL,    OUTPUT, NONE,   "PA 2",     ,           ,       ,       ,       ,       ,       "TX1"