build: sync Kconfig and Makefile changes with Klipper

Signed-off-by:  Eric Callahan <arksine.code@gmail.com>

src/Kconfig

@@ -18,6 +18,8 @@ source "src/stm32/Kconfig"
 source "src/lpc176x/Kconfig"
 
 # Generic configuration options for serial ports
+config SERIAL
+    bool
 config SERIAL_BAUD
     depends on SERIAL
     int "Baud rate for serial port" if LOW_LEVEL_OPTIONS
@@ -27,12 +29,14 @@ config SERIAL_BAUD
         to 250000. Read the FAQ before changing this value.
 
 # Generic configuration options for USB
+config USBSERIAL
+    bool
 config USB_VENDOR_ID
     default 0x1d50
 config USB_DEVICE_ID
     default 0x6177
 config USB_SERIAL_NUMBER_CHIPID
-    depends on HAVE_CHIPID
+    depends on HAVE_CHIPID && USBSERIAL
     default y
 config USB_SERIAL_NUMBER
     default "12345"
@@ -40,15 +44,28 @@ config USB_SERIAL_NUMBER
 menu "USB ids"
     depends on USBSERIAL && LOW_LEVEL_OPTIONS
 config USB_VENDOR_ID
-    hex "USB vendor ID"
+    hex "USB vendor ID" if USBSERIAL
 config USB_DEVICE_ID
-    hex "USB device ID"
+    hex "USB device ID" if USBSERIAL
 config USB_SERIAL_NUMBER_CHIPID
     bool "USB serial number from CHIPID" if HAVE_CHIPID
 config USB_SERIAL_NUMBER
     string "USB serial number" if !USB_SERIAL_NUMBER_CHIPID
 endmenu
 
+# Generic configuration options for CANbus
+config CANSERIAL
+    bool
+config CANBUS
+    bool
+    default y if CANSERIAL
+config CANBUS_FREQUENCY
+    int "CAN bus speed" if CANBUS
+    default 500000
+config CANBUS_FILTER
+    bool
+    default y if CANSERIAL
+
 config INITIAL_PINS
     string "GPIO pins to set on bootloader entry"
     depends on LOW_LEVEL_OPTIONS

src/lpc176x/Kconfig

@@ -57,10 +57,6 @@ config FLASH_START
     hex
     default 0x0000
 
-config USBSERIAL
-    bool
-config SERIAL
-    bool
 choice
     prompt "Communication interface"
     config LPC_USB

src/stm32/Kconfig

@@ -75,6 +75,10 @@ choice
         select MACH_STM32H7
 endchoice
 
+config MACH_STM32F103x6
+    depends on LOW_LEVEL_OPTIONS && MACH_STM32F103
+    bool "Only 10KiB of RAM (for rare stm32f103x6 variant)"
+
 config MACH_STM32F0
     bool
 config MACH_STM32F1
@@ -93,7 +97,8 @@ config MACH_STM32F4x5 # F405, F407, F429 series
     bool
 config HAVE_STM32_USBFS
     bool
-    default y if MACH_STM32F103 || MACH_STM32F0x2 || MACH_STM32F070 || MACH_STM32G0
+    default y if MACH_STM32F0x2 || MACH_STM32G0
+    default y if (MACH_STM32F103 || MACH_STM32F070) && !STM32_CLOCK_REF_INTERNAL
 config HAVE_STM32_USBOTG
     bool
     default y if MACH_STM32F2 || MACH_STM32F4 || MACH_STM32H7
@@ -152,7 +157,8 @@ config RAM_SIZE
     default 0x1000 if MACH_STM32F031
     default 0x1800 if MACH_STM32F042
     default 0x4000 if MACH_STM32F070 || MACH_STM32F072
-    default 0x5000 if MACH_STM32F103 # Ram size of stm32f103x8 (20KiB)
+    default 0x2800 if MACH_STM32F103x6
+    default 0x5000 if MACH_STM32F103 && !MACH_STM32F103x6 # Ram size of stm32f103x8
     default 0x20000 if MACH_STM32F207
     default 0x10000 if MACH_STM32F401
     default 0x20000 if MACH_STM32F4x5 || MACH_STM32F446
@@ -257,12 +263,6 @@ config STM32F0_TRIM
 # Communication inteface
 ######################################################################
 
-config USBSERIAL
-    bool
-config SERIAL
-    bool
-config CANSERIAL
-    bool
 choice
     prompt "Communication interface"
     config STM32_USB_PA11_PA12
@@ -332,11 +332,6 @@ choice
         select CANSERIAL
 endchoice
 
-config CANBUS_FREQUENCY
-    int "CAN bus speed" if LOW_LEVEL_OPTIONS && CANSERIAL
-    default 500000
-
-
 ######################################################################
 # Flash settings
 ######################################################################

src/stm32/Makefile

@@ -3,7 +3,7 @@
 # Setup the toolchain
 CROSS_PREFIX=arm-none-eabi-
 
-dirs-y += src/stm32 src/generic
+dirs-y += src/stm32 src/generic lib/fast-hash
 dirs-$(CONFIG_MACH_STM32F0) += lib/stm32f0
 dirs-$(CONFIG_MACH_STM32F1) += lib/stm32f1
 dirs-$(CONFIG_MACH_STM32F2) += lib/stm32f2
@@ -53,10 +53,9 @@ serial-src-$(CONFIG_MACH_STM32F0) := stm32/stm32f0_serial.c
 serial-src-$(CONFIG_MACH_STM32G0) := stm32/stm32f0_serial.c
 serial-src-$(CONFIG_MACH_STM32H7) := stm32/stm32h7_serial.c
 src-$(CONFIG_SERIAL) += $(serial-src-y) generic/serial_irq.c
-src-$(CONFIG_CANSERIAL) += stm32/can.c ../lib/fast-hash/fasthash.c
-src-$(CONFIG_CANSERIAL) += generic/canbus.c
-
-dirs-$(CONFIG_CANSERIAL) += lib/fast-hash
+canbus-src-y := generic/canserial.c ../lib/fast-hash/fasthash.c
+canbus-src-$(CONFIG_HAVE_STM32_CANBUS) += stm32/can.c
+src-$(CONFIG_CANSERIAL) += $(canbus-src-y) generic/canbus.c stm32/chipid.c
 
 # Binary output file rules
 target-y += $(OUT)canboot.bin