boards/defconfig: remove fixed CDCACM BUFFER SIZE

yangsong8-a1 · Alan C. Assis · commit 21c8ed80bd19 · 2025-03-05T12:52:00.000-03:00
Use usb req buf to replaced cdcacm rxbuffer and txbuffer,
so this macro is no longer needed.

Signed-off-by: yangsong8 &lt;yangsong8@xiaomi.com&gt;
diff --git a/Documentation/platforms/arm/kinetis/boards/freedom-k64f/README.txt b/Documentation/platforms/arm/kinetis/boards/freedom-k64f/README.txt
@@ -577,9 +577,6 @@ USB Device Controller Support
       CONFIG_CDCACM_NRDREQS=8                   : Number of read requests
       CONFIG_CDCACM_BULKIN_REQLEN=96            : Size of write request buffer (for full speed)
       CONFIG_CDCACM_BULKIN_REQLEN=768           : Size of write request buffer (for high speed)
-      CONFIG_CDCACM_RXBUFSIZE=257               : Serial read buffer size
-      CONFIG_CDCACM_TXBUFSIZE=193               : Serial transmit buffer size (for full speed)
-      CONFIG_CDCACM_TXBUFSIZE=769               : Serial transmit buffer size (for high speed)
       CONFIG_CDCACM_VENDORID=0x0525             : Vendor ID
       CONFIG_CDCACM_PRODUCTID=0xa4a7            : Product ID
       CONFIG_CDCACM_VENDORSTR="NuttX"           : Vendor string
@@ -593,7 +590,7 @@ USB Device Controller Support
 
     CONFIG_SYSTEM_CDCACM=y                     : Enable connect/disconnect support
     CONFIG_SYSTEM_CDCACM_DEVMINOR=0            : Use device /dev/ttyACM0
-    CONFIG_CDCACM_RXBUFSIZE=???                : A large RX may be needed
+    CONFIG_CDCACM_NRDREQS=???                  : Multiple read requests may be needed
 
   If you include this CDC/ACM application, then you can connect the CDC/ACM
   serial device to the host by entering the command 'sercon' and you detach
diff --git a/Documentation/platforms/arm/kinetis/boards/freedom-k66f/README.txt b/Documentation/platforms/arm/kinetis/boards/freedom-k66f/README.txt
@@ -580,9 +580,6 @@ USB Device Controller Support
       CONFIG_CDCACM_NRDREQS=8                   : Number of read requests
       CONFIG_CDCACM_BULKIN_REQLEN=96            : Size of write request buffer (for full speed)
       CONFIG_CDCACM_BULKIN_REQLEN=768           : Size of write request buffer (for high speed)
-      CONFIG_CDCACM_RXBUFSIZE=257               : Serial read buffer size
-      CONFIG_CDCACM_TXBUFSIZE=193               : Serial transmit buffer size (for full speed)
-      CONFIG_CDCACM_TXBUFSIZE=769               : Serial transmit buffer size (for high speed)
       CONFIG_CDCACM_VENDORID=0x0525             : Vendor ID
       CONFIG_CDCACM_PRODUCTID=0xa4a7            : Product ID
       CONFIG_CDCACM_VENDORSTR="NuttX"           : Vendor string
@@ -596,7 +593,7 @@ USB Device Controller Support
 
     CONFIG_SYSTEM_CDCACM=y                     : Enable connect/disconnect support
     CONFIG_SYSTEM_CDCACM_DEVMINOR=0            : Use device /dev/ttyACM0
-    CONFIG_CDCACM_RXBUFSIZE=???                : A large RX may be needed
+    CONFIG_CDCACM_NRDREQS=???                  : Multiple read requests may be needed
 
   If you include this CDC/ACM application, then you can connect the CDC/ACM
   serial device to the host by entering the command 'sercon' and you detach
diff --git a/Documentation/platforms/arm/sam34/boards/sam4e-ek/README.txt b/Documentation/platforms/arm/sam34/boards/sam4e-ek/README.txt
@@ -593,9 +593,11 @@ USB Full-Speed Device
 
      1. RX buffer size.  All incoming data is buffered by the serial driver
         until it can be read by the application.  The default size of this
-        RX buffer is only 256 but can be increased as you see fit:
+        RX buffer is related to CONFIG_CDCACM_NRDREQS, the maximum packet
+        length and CONFIG_CDCACM_BULKOUT_REQLEN. It can be increased as you
+        see fit:
 
-         CONFIG_CDCACM_RXBUFSIZE=256        : Default RX buffer size is only 256 bytes
+         CONFIG_CDCACM_NRDREQS=xxx
 
      2. Upstream from the RX buffers are USB read request buffers.  Each
         buffer is the maximum size of one USB packet (64 byte) and that cannot
diff --git a/Documentation/platforms/arm/samv7/boards/same70-xplained/README.txt b/Documentation/platforms/arm/samv7/boards/same70-xplained/README.txt
@@ -646,9 +646,6 @@ serial device class:
     CONFIG_CDCACM_NRDREQS=8                   : Number of read requests
     CONFIG_CDCACM_BULKIN_REQLEN=96            : Size of write request buffer (for full speed)
     CONFIG_CDCACM_BULKIN_REQLEN=768           : Size of write request buffer (for high speed)
-    CONFIG_CDCACM_RXBUFSIZE=257               : Serial read buffer size
-    CONFIG_CDCACM_TXBUFSIZE=193               : Serial transmit buffer size (for full speed)
-    CONFIG_CDCACM_TXBUFSIZE=769               : Serial transmit buffer size (for high speed)
     CONFIG_CDCACM_VENDORID=0x0525             : Vendor ID
     CONFIG_CDCACM_PRODUCTID=0xa4a7            : Product ID
     CONFIG_CDCACM_VENDORSTR="NuttX"           : Vendor string
@@ -662,7 +659,7 @@ CDC/ACM serial device:
 
     CONFIG_SYSTEM_CDCACM=y                     : Enable connect/disconnect support
     CONFIG_SYSTEM_CDCACM_DEVMINOR=0            : Use device /dev/ttyACM0
-    CONFIG_CDCACM_RXBUFSIZE=???                : A large RX may be needed
+    CONFIG_CDCACM_NRDREQS=???                  : Multiple read requests may be needed
 
 If you include this CDC/ACM application, then you can connect the CDC/ACM
 serial device to the host by entering the command 'sercon' and you detach
diff --git a/Documentation/platforms/arm/samv7/boards/samv71-xult/README.txt b/Documentation/platforms/arm/samv7/boards/samv71-xult/README.txt
@@ -967,9 +967,6 @@ serial device class:
     CONFIG_CDCACM_NRDREQS=8                   : Number of read requests
     CONFIG_CDCACM_BULKIN_REQLEN=96            : Size of write request buffer (for full speed)
     CONFIG_CDCACM_BULKIN_REQLEN=768           : Size of write request buffer (for high speed)
-    CONFIG_CDCACM_RXBUFSIZE=257               : Serial read buffer size
-    CONFIG_CDCACM_TXBUFSIZE=193               : Serial transmit buffer size (for full speed)
-    CONFIG_CDCACM_TXBUFSIZE=769               : Serial transmit buffer size (for high speed)
     CONFIG_CDCACM_VENDORID=0x0525             : Vendor ID
     CONFIG_CDCACM_PRODUCTID=0xa4a7            : Product ID
     CONFIG_CDCACM_VENDORSTR="NuttX"           : Vendor string
@@ -983,7 +980,7 @@ CDC/ACM serial device:
 
     CONFIG_SYSTEM_CDCACM=y                     : Enable connect/disconnect support
     CONFIG_SYSTEM_CDCACM_DEVMINOR=0            : Use device /dev/ttyACM0
-    CONFIG_CDCACM_RXBUFSIZE=???                : A large RX may be needed
+    CONFIG_CDCACM_NRDREQS=???                  : Multiple read requests may be needed
 
 If you include this CDC/ACM application, then you can connect the CDC/ACM
 serial device to the host by entering the command 'sercon' and you detach
diff --git a/Documentation/platforms/arm/stm32l4/boards/stm32l476vg-disco/index.rst b/Documentation/platforms/arm/stm32l4/boards/stm32l476vg-disco/index.rst
@@ -488,8 +488,6 @@ NOTES:
          CONFIG_CDCACM_NRDREQS=4
          CONFIG_CDCACM_NWRREQS=4
          CONFIG_CDCACM_BULKIN_REQLEN=96
-         CONFIG_CDCACM_RXBUFSIZE=257
-         CONFIG_CDCACM_TXBUFSIZE=193
          CONFIG_CDCACM_VENDORID=0x0525
          CONFIG_CDCACM_PRODUCTID=0xa4a7
          CONFIG_CDCACM_VENDORSTR="NuttX"
diff --git a/Documentation/platforms/arm/stm32l4/boards/stm32l4r9ai-disco/index.rst b/Documentation/platforms/arm/stm32l4/boards/stm32l4r9ai-disco/index.rst
@@ -376,8 +376,6 @@ NOTES:
          CONFIG_CDCACM_NRDREQS=4
          CONFIG_CDCACM_NWRREQS=4
          CONFIG_CDCACM_BULKIN_REQLEN=96
-         CONFIG_CDCACM_RXBUFSIZE=257
-         CONFIG_CDCACM_TXBUFSIZE=193
          CONFIG_CDCACM_VENDORID=0x0525
          CONFIG_CDCACM_PRODUCTID=0xa4a7
          CONFIG_CDCACM_VENDORSTR="NuttX"
diff --git a/boards/arm/imxrt/imxrt1170-evk/configs/netnsh/defconfig b/boards/arm/imxrt/imxrt1170-evk/configs/netnsh/defconfig
@@ -30,8 +30,6 @@ CONFIG_CDCACM=y
 CONFIG_CDCACM_BULKIN_REQLEN=96
 CONFIG_CDCACM_PRODUCTID=0x001d
 CONFIG_CDCACM_PRODUCTSTR="PX4 FMURT1062 v1.x"
-CONFIG_CDCACM_RXBUFSIZE=600
-CONFIG_CDCACM_TXBUFSIZE=12000
 CONFIG_CDCACM_VENDORID=0x1FC9
 CONFIG_CDCACM_VENDORSTR="NXP SEMICONDUCTORS"
 CONFIG_DEBUG_ASSERTIONS=y
diff --git a/boards/arm/lpc214x/mcu123-lpc214x/configs/composite/defconfig b/boards/arm/lpc214x/mcu123-lpc214x/configs/composite/defconfig
@@ -20,8 +20,6 @@ CONFIG_BOARDCTL=y
 CONFIG_BOARD_LOOPSPERMSEC=3270
 CONFIG_CDCACM=y
 CONFIG_CDCACM_COMPOSITE=y
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=256
 CONFIG_COMPOSITE_CONFIGSTR="system/composite"
 CONFIG_COMPOSITE_IAD=y
 CONFIG_COMPOSITE_PRODUCTID=0x2022
diff --git a/boards/arm/lpc43xx/lpc4337-ws/configs/nsh/defconfig b/boards/arm/lpc43xx/lpc4337-ws/configs/nsh/defconfig
@@ -25,8 +25,6 @@ CONFIG_CDCACM_BULKIN_REQLEN=96
 CONFIG_CDCACM_EPBULKOUT=2
 CONFIG_CDCACM_PRODUCTID=0x2044
 CONFIG_CDCACM_PRODUCTSTR="lpc4337-ws"
-CONFIG_CDCACM_RXBUFSIZE=512
-CONFIG_CDCACM_TXBUFSIZE=2048
 CONFIG_CDCACM_VENDORID=0x03EB
 CONFIG_CDCACM_VENDORSTR="nuttx"
 CONFIG_FAT_LCNAMES=y
diff --git a/boards/arm/lpc43xx/lpc4370-link2/configs/nsh/defconfig b/boards/arm/lpc43xx/lpc4370-link2/configs/nsh/defconfig
@@ -23,8 +23,6 @@ CONFIG_CDCACM=y
 CONFIG_CDCACM_BULKIN_REQLEN=96
 CONFIG_CDCACM_PRODUCTID=0x2044
 CONFIG_CDCACM_PRODUCTSTR="lpc4370-link2"
-CONFIG_CDCACM_RXBUFSIZE=512
-CONFIG_CDCACM_TXBUFSIZE=2048
 CONFIG_CDCACM_VENDORID=0x03EB
 CONFIG_CDCACM_VENDORSTR="nuttx"
 CONFIG_FAT_LCNAMES=y
diff --git a/boards/arm/nrf52/nrf52840-dk/configs/cdcacm/defconfig b/boards/arm/nrf52/nrf52840-dk/configs/cdcacm/defconfig
@@ -17,8 +17,6 @@ CONFIG_ARCH_STDARG_H=y
 CONFIG_BOARD_LOOPSPERMSEC=5500
 CONFIG_BUILTIN=y
 CONFIG_CDCACM=y
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=2048
 CONFIG_DEBUG_FULLOPT=y
 CONFIG_DEBUG_SYMBOLS=y
 CONFIG_FAT_LCNAMES=y
diff --git a/boards/arm/nrf53/thingy53/configs/rgbled_cpuapp/defconfig b/boards/arm/nrf53/thingy53/configs/rgbled_cpuapp/defconfig
@@ -21,8 +21,6 @@ CONFIG_BOARD_LOOPSPERMSEC=5500
 CONFIG_BUILTIN=y
 CONFIG_CDCACM=y
 CONFIG_CDCACM_CONSOLE=y
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=256
 CONFIG_DEBUG_ASSERTIONS=y
 CONFIG_DEBUG_FEATURES=y
 CONFIG_DEBUG_FULLOPT=y
diff --git a/boards/arm/sam34/sam4e-ek/configs/usbnsh/defconfig b/boards/arm/sam34/sam4e-ek/configs/usbnsh/defconfig
@@ -27,8 +27,6 @@ CONFIG_CDCACM=y
 CONFIG_CDCACM_CONSOLE=y
 CONFIG_CDCACM_EPBULKIN=3
 CONFIG_CDCACM_EPBULKOUT=2
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=256
 CONFIG_ETH0_PHY_KSZ8051=y
 CONFIG_FAT_LCNAMES=y
 CONFIG_FAT_LFN=y
diff --git a/boards/arm/sam34/sam4s-xplained-pro/configs/fs/defconfig b/boards/arm/sam34/sam4s-xplained-pro/configs/fs/defconfig
@@ -25,8 +25,6 @@ CONFIG_BOARD_LOOPSPERMSEC=11401
 CONFIG_BUILTIN=y
 CONFIG_CDCACM=y
 CONFIG_CDCACM_BULKIN_REQLEN=250
-CONFIG_CDCACM_RXBUFSIZE=1024
-CONFIG_CDCACM_TXBUFSIZE=1024
 CONFIG_DEBUG_FULLOPT=y
 CONFIG_DEBUG_SYMBOLS=y
 CONFIG_FS_FAT=y
diff --git a/boards/arm/sam34/sam4s-xplained-pro/configs/nsh/defconfig b/boards/arm/sam34/sam4s-xplained-pro/configs/nsh/defconfig
@@ -22,8 +22,6 @@ CONFIG_BOARD_LOOPSPERMSEC=11401
 CONFIG_BUILTIN=y
 CONFIG_CDCACM=y
 CONFIG_CDCACM_BULKIN_REQLEN=250
-CONFIG_CDCACM_RXBUFSIZE=1024
-CONFIG_CDCACM_TXBUFSIZE=1024
 CONFIG_DEBUG_FULLOPT=y
 CONFIG_DEBUG_SYMBOLS=y
 CONFIG_EXAMPLES_CPUHOG=y
diff --git a/boards/arm/stm32/clicker2-stm32/configs/mrf24j40-6lowpan/defconfig b/boards/arm/stm32/clicker2-stm32/configs/mrf24j40-6lowpan/defconfig
@@ -23,8 +23,6 @@ CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_BUILTIN=y
 CONFIG_CDCACM=y
 CONFIG_CDCACM_CONSOLE=y
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=256
 CONFIG_DRIVERS_IEEE802154=y
 CONFIG_DRIVERS_WIRELESS=y
 CONFIG_EXAMPLES_NETTEST=y
diff --git a/boards/arm/stm32/clicker2-stm32/configs/mrf24j40-starhub/defconfig b/boards/arm/stm32/clicker2-stm32/configs/mrf24j40-starhub/defconfig
@@ -23,8 +23,6 @@ CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_BUILTIN=y
 CONFIG_CDCACM=y
 CONFIG_CDCACM_CONSOLE=y
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=256
 CONFIG_DRIVERS_IEEE802154=y
 CONFIG_DRIVERS_WIRELESS=y
 CONFIG_FAT_LCNAMES=y
diff --git a/boards/arm/stm32/clicker2-stm32/configs/mrf24j40-starpoint/defconfig b/boards/arm/stm32/clicker2-stm32/configs/mrf24j40-starpoint/defconfig
@@ -23,8 +23,6 @@ CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_BUILTIN=y
 CONFIG_CDCACM=y
 CONFIG_CDCACM_CONSOLE=y
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=256
 CONFIG_DRIVERS_IEEE802154=y
 CONFIG_DRIVERS_WIRELESS=y
 CONFIG_EXAMPLES_NETTEST=y
diff --git a/boards/arm/stm32/clicker2-stm32/configs/usbnsh/defconfig b/boards/arm/stm32/clicker2-stm32/configs/usbnsh/defconfig
@@ -21,8 +21,6 @@ CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_BUILTIN=y
 CONFIG_CDCACM=y
 CONFIG_CDCACM_CONSOLE=y
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=256
 CONFIG_FAT_LCNAMES=y
 CONFIG_FAT_LFN=y
 CONFIG_FS_FAT=y
diff --git a/boards/arm/stm32/clicker2-stm32/configs/xbee-6lowpan/defconfig b/boards/arm/stm32/clicker2-stm32/configs/xbee-6lowpan/defconfig
@@ -23,8 +23,6 @@ CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_BUILTIN=y
 CONFIG_CDCACM=y
 CONFIG_CDCACM_CONSOLE=y
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=256
 CONFIG_CLICKER2_STM32_MB1_XBEE=y
 CONFIG_DRIVERS_IEEE802154=y
 CONFIG_DRIVERS_WIRELESS=y
diff --git a/boards/arm/stm32/hymini-stm32v/configs/usbnsh/defconfig b/boards/arm/stm32/hymini-stm32v/configs/usbnsh/defconfig
@@ -21,8 +21,6 @@ CONFIG_BOARDCTL_USBDEVCTRL=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_CDCACM=y
 CONFIG_CDCACM_CONSOLE=y
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=256
 CONFIG_INIT_ENTRYPOINT="nsh_main"
 CONFIG_NSH_READLINE=y
 CONFIG_PREALLOC_TIMERS=4
diff --git a/boards/arm/stm32/maple/configs/nx/defconfig b/boards/arm/stm32/maple/configs/nx/defconfig
@@ -34,8 +34,6 @@ CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_BUILTIN=y
 CONFIG_CDCACM=y
 CONFIG_CDCACM_CONSOLE=y
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=256
 CONFIG_DEFAULT_SMALL=y
 CONFIG_EXAMPLES_NX=y
 CONFIG_EXAMPLES_NXHELLO=y
diff --git a/boards/arm/stm32/maple/configs/usbnsh/defconfig b/boards/arm/stm32/maple/configs/usbnsh/defconfig
@@ -33,8 +33,6 @@ CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_BUILTIN=y
 CONFIG_CDCACM=y
 CONFIG_CDCACM_CONSOLE=y
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=256
 CONFIG_DEFAULT_SMALL=y
 CONFIG_I2C=y
 CONFIG_INIT_ENTRYPOINT="nsh_main"
diff --git a/boards/arm/stm32/mikroe-stm32f4/configs/fulldemo/defconfig b/boards/arm/stm32/mikroe-stm32f4/configs/fulldemo/defconfig
@@ -31,8 +31,6 @@ CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_BUILTIN=y
 CONFIG_CDCACM=y
 CONFIG_CDCACM_CONSOLE=y
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=256
 CONFIG_DEBUG_SYMBOLS=y
 CONFIG_DEV_LOOP=y
 CONFIG_DRIVERS_AUDIO=y
diff --git a/boards/arm/stm32/mikroe-stm32f4/configs/kostest/defconfig b/boards/arm/stm32/mikroe-stm32f4/configs/kostest/defconfig
@@ -23,8 +23,6 @@ CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_BUILD_PROTECTED=y
 CONFIG_CDCACM=y
 CONFIG_CDCACM_CONSOLE=y
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=256
 CONFIG_DEBUG_SYMBOLS=y
 CONFIG_DEV_LOOP=y
 CONFIG_FS_FAT=y
diff --git a/boards/arm/stm32/mikroe-stm32f4/configs/usbnsh/defconfig b/boards/arm/stm32/mikroe-stm32f4/configs/usbnsh/defconfig
@@ -23,8 +23,6 @@ CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_BUILTIN=y
 CONFIG_CDCACM=y
 CONFIG_CDCACM_CONSOLE=y
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=256
 CONFIG_DEV_LOOP=y
 CONFIG_FS_FAT=y
 CONFIG_FS_ROMFS=y
diff --git a/boards/arm/stm32/odrive36/configs/usbnsh/defconfig b/boards/arm/stm32/odrive36/configs/usbnsh/defconfig
@@ -20,8 +20,6 @@ CONFIG_BOARD_LOOPSPERMSEC=15272
 CONFIG_BUILTIN=y
 CONFIG_CDCACM=y
 CONFIG_CDCACM_CONSOLE=y
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=256
 CONFIG_DEBUG_FULLOPT=y
 CONFIG_DEBUG_SYMBOLS=y
 CONFIG_EXAMPLES_HELLO=y
diff --git a/boards/arm/stm32/olimex-stm32-e407/configs/ina219/defconfig b/boards/arm/stm32/olimex-stm32-e407/configs/ina219/defconfig
@@ -22,8 +22,6 @@ CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_BUILTIN=y
 CONFIG_CDCACM=y
 CONFIG_CDCACM_CONSOLE=y
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=256
 CONFIG_EXAMPLES_HELLO=y
 CONFIG_EXAMPLES_INA219=y
 CONFIG_FS_PROCFS=y
diff --git a/boards/arm/stm32/olimex-stm32-e407/configs/usbnsh/defconfig b/boards/arm/stm32/olimex-stm32-e407/configs/usbnsh/defconfig
@@ -20,8 +20,6 @@ CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_BUILTIN=y
 CONFIG_CDCACM=y
 CONFIG_CDCACM_CONSOLE=y
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=256
 CONFIG_EXAMPLES_HELLO=y
 CONFIG_EXAMPLES_HELLOXX=y
 CONFIG_FS_PROCFS=y
diff --git a/boards/arm/stm32/olimex-stm32-h405/configs/usbnsh/defconfig b/boards/arm/stm32/olimex-stm32-h405/configs/usbnsh/defconfig
@@ -27,8 +27,6 @@ CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_BUILTIN=y
 CONFIG_CDCACM=y
 CONFIG_CDCACM_CONSOLE=y
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=256
 CONFIG_DEBUG_SYMBOLS=y
 CONFIG_EXAMPLES_ADC=y
 CONFIG_EXAMPLES_CAN=y
diff --git a/boards/arm/stm32/olimexino-stm32/configs/composite/defconfig b/boards/arm/stm32/olimexino-stm32/configs/composite/defconfig
@@ -48,8 +48,6 @@ CONFIG_CDCACM=y
 CONFIG_CDCACM_COMPOSITE=y
 CONFIG_CDCACM_NRDREQS=2
 CONFIG_CDCACM_NWRREQS=2
-CONFIG_CDCACM_RXBUFSIZE=96
-CONFIG_CDCACM_TXBUFSIZE=96
 CONFIG_COMPOSITE_IAD=y
 CONFIG_COMPOSITE_PRODUCTID=0x2022
 CONFIG_COMPOSITE_PRODUCTSTR="Composite Device"
diff --git a/boards/arm/stm32/stm3210e-eval/configs/composite/defconfig b/boards/arm/stm32/stm3210e-eval/configs/composite/defconfig
@@ -18,8 +18,6 @@ CONFIG_BOARDCTL=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_CDCACM=y
 CONFIG_CDCACM_COMPOSITE=y
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=256
 CONFIG_COMPOSITE_CONFIGSTR="system/composite"
 CONFIG_COMPOSITE_IAD=y
 CONFIG_COMPOSITE_PRODUCTID=0x2022
diff --git a/boards/arm/stm32/stm32_tiny/configs/usbnsh/defconfig b/boards/arm/stm32/stm32_tiny/configs/usbnsh/defconfig
@@ -31,8 +31,6 @@ CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_BUILTIN=y
 CONFIG_CDCACM=y
 CONFIG_CDCACM_CONSOLE=y
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=256
 CONFIG_DEFAULT_SMALL=y
 CONFIG_INIT_ENTRYPOINT="nsh_main"
 CONFIG_LINE_MAX=80
diff --git a/boards/arm/stm32/stm32f103-minimum/configs/sensors/defconfig b/boards/arm/stm32/stm32f103-minimum/configs/sensors/defconfig
@@ -27,8 +27,6 @@ CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_BUILTIN=y
 CONFIG_CDCACM=y
 CONFIG_CDCACM_CONSOLE=y
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=256
 CONFIG_DEFAULT_SMALL=y
 CONFIG_I2C=y
 CONFIG_I2C_DRIVER=y
diff --git a/boards/arm/stm32/stm32f103-minimum/configs/usbnsh/defconfig b/boards/arm/stm32/stm32f103-minimum/configs/usbnsh/defconfig
@@ -31,8 +31,6 @@ CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_BUILTIN=y
 CONFIG_CDCACM=y
 CONFIG_CDCACM_CONSOLE=y
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=256
 CONFIG_DEFAULT_SMALL=y
 CONFIG_INIT_ENTRYPOINT="nsh_main"
 CONFIG_LINE_MAX=80
diff --git a/boards/arm/stm32/stm32f3discovery/configs/nsh/defconfig b/boards/arm/stm32/stm32f3discovery/configs/nsh/defconfig
@@ -19,8 +19,6 @@ CONFIG_ARCH_STACKDUMP=y
 CONFIG_BOARD_LOOPSPERMSEC=6522
 CONFIG_BUILTIN=y
 CONFIG_CDCACM=y
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=256
 CONFIG_HAVE_CXX=y
 CONFIG_HAVE_CXXINITIALIZE=y
 CONFIG_HOST_WINDOWS=y
diff --git a/boards/arm/stm32/stm32f3discovery/configs/usbnsh/defconfig b/boards/arm/stm32/stm32f3discovery/configs/usbnsh/defconfig
@@ -22,8 +22,6 @@ CONFIG_BOARD_LOOPSPERMSEC=6522
 CONFIG_BUILTIN=y
 CONFIG_CDCACM=y
 CONFIG_CDCACM_CONSOLE=y
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=256
 CONFIG_HAVE_CXX=y
 CONFIG_HAVE_CXXINITIALIZE=y
 CONFIG_HOST_WINDOWS=y
diff --git a/boards/arm/stm32/stm32f429i-disco/configs/usbnsh/defconfig b/boards/arm/stm32/stm32f429i-disco/configs/usbnsh/defconfig
@@ -20,8 +20,6 @@ CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_BUILTIN=y
 CONFIG_CDCACM=y
 CONFIG_CDCACM_CONSOLE=y
-CONFIG_CDCACM_RXBUFSIZE=256
-CONFIG_CDCACM_TXBUFSIZE=256
 CONFIG_DEV_LOOP=y
 CONFIG_FS_FAT=y
 CONFIG_FS_PROCFS=y
diff --git a/boards/arm/stm32/stm32f4discovery/configs/nxscope_cdcacm/defconfig b/boards/arm/stm32/stm32f4discovery/configs/nxscope_cdcacm/defconfig
diff --git a/boards/arm/stm32/stm32f4discovery/configs/usbnsh/defconfig b/boards/arm/stm32/stm32f4discovery/configs/usbnsh/defconfig
diff --git a/boards/arm/stm32l4/steval-stlcs01v1/configs/usbnsh/defconfig b/boards/arm/stm32l4/steval-stlcs01v1/configs/usbnsh/defconfig
diff --git a/boards/mips/pic32mx/sure-pic32mx/configs/usbnsh/defconfig b/boards/mips/pic32mx/sure-pic32mx/configs/usbnsh/defconfig
diff --git a/boards/risc-v/mpfs/icicle/configs/hwtest/defconfig b/boards/risc-v/mpfs/icicle/configs/hwtest/defconfig
