add PPP support

Author: Jason2866

configs/defconfig.esp32

@@ -29,7 +29,6 @@ CONFIG_ETH_PHY_INTERFACE_RMII=y
 CONFIG_ETH_USE_SPI_ETHERNET=y
 
 # CONFIG_SPIRAM is not set
-# CONFIG_SPIRAM_OCCUPY_HSPI_HOST is not set
 CONFIG_ULP_COPROC_ENABLED=y
 # CONFIG_ESP_TASK_WDT_CHECK_IDLE_TASK_CPU1 is not set
 # CONFIG_UNITY_ENABLE_FLOAT is not set
@@ -40,8 +39,20 @@ CONFIG_ULP_COPROC_ENABLED=y
 # CONFIG_VFS_SUPPORT_SELECT is not set
 # CONFIG_VFS_SUPPRESS_SELECT_DEBUG_OUTPUT is not set
 # CONFIG_VFS_SUPPORT_TERMIOS is not set
-CONFIG_TWAI_ERRATA_FIX_BUS_OFF_REC=y
-CONFIG_TWAI_ERRATA_FIX_TX_INTR_LOST=y
-CONFIG_TWAI_ERRATA_FIX_RX_FRAME_INVALID=y
-CONFIG_TWAI_ERRATA_FIX_RX_FIFO_CORRUPT=y
+
 CONFIG_FREERTOS_WATCHPOINT_END_OF_STACK=y
+
+# We dont use TWAI so disable the fixes which adds dead code
+# CONFIG_TWAI_ERRATA_FIX_BUS_OFF_REC is not set
+# CONFIG_TWAI_ERRATA_FIX_TX_INTR_LOST is not set
+# CONFIG_TWAI_ERRATA_FIX_RX_FRAME_INVALID is not set
+# CONFIG_TWAI_ERRATA_FIX_RX_FIFO_CORRUPT is not set
+# CONFIG_TWAI_ERRATA_FIX_LISTEN_ONLY_DOM is not set
+
+#
+# PPP
+#
+CONFIG_LWIP_PPP_SUPPORT=y
+CONFIG_LWIP_PPP_NOTIFY_PHASE_SUPPORT=y
+CONFIG_LWIP_PPP_PAP_SUPPORT=y
+CONFIG_LWIP_PPP_ENABLE_IPV6=n