Remove SERIAL_LINK feature (#14727)

* Remove SERIAL_LINK

* more stale paths in doxygen-todo

* Fix

* More refs

* Update testing docs

* Update doxygen-todo

Co-authored-by: Ryan <fauxpark@gmail.com>

Co-authored-by: Ryan <fauxpark@gmail.com>

36 files changed, 7 insertions, 2252 deletions

diff --git a/build_test.mk b/build_test.mk
index 037577bf90..96487c01fa 100644
--- a/build_test.mk
+++ b/build_test.mk
@@ -55,7 +55,6 @@ include common_features.mk
 include $(TMK_PATH)/common.mk
 include $(QUANTUM_PATH)/debounce/tests/rules.mk
 include $(QUANTUM_PATH)/sequencer/tests/rules.mk
-include $(QUANTUM_PATH)/serial_link/tests/rules.mk
 include $(TMK_PATH)/common/test/rules.mk
 ifneq ($(filter $(FULL_TESTS),$(TEST)),)
 include build_full_test.mk
diff --git a/common_features.mk b/common_features.mk
index fc9595ddd7..3c956b7aaf 100644
--- a/common_features.mk
+++ b/common_features.mk
@@ -13,8 +13,6 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-SERIAL_PATH := $(QUANTUM_PATH)/serial_link
-
 QUANTUM_SRC += \
     $(QUANTUM_DIR)/quantum.c \
     $(QUANTUM_DIR)/send_string.c \
@@ -363,17 +361,6 @@ ifeq ($(strip $(PRINTING_ENABLE)), yes)
     SRC += $(TMK_DIR)/protocol/serial_uart.c
 endif
 
-ifeq ($(strip $(SERIAL_LINK_ENABLE)), yes)
-    SERIAL_SRC := $(wildcard $(SERIAL_PATH)/protocol/*.c)
-    SERIAL_SRC += $(wildcard $(SERIAL_PATH)/system/*.c)
-    SERIAL_DEFS += -DSERIAL_LINK_ENABLE
-    COMMON_VPATH += $(SERIAL_PATH)
-
-    SRC += $(patsubst $(QUANTUM_PATH)/%,%,$(SERIAL_SRC))
-    OPT_DEFS += $(SERIAL_DEFS)
-    VAPTH += $(SERIAL_PATH)
-endif
-
 VARIABLE_TRACE ?= no
 ifneq ($(strip $(VARIABLE_TRACE)),no)
     SRC += $(QUANTUM_DIR)/variable_trace.c
diff --git a/disable_features.mk b/disable_features.mk
index 6733e4e808..090a9b5a11 100644
--- a/disable_features.mk
+++ b/disable_features.mk
@@ -19,7 +19,6 @@ FEATURE_NAMES += PS2_MOUSE
 FEATURE_NAMES += RGBLIGHT
 FEATURE_NAMES += RGB_MATRIX
 FEATURE_NAMES += SLEEP_LED
-FEATURE_NAMES += SERIAL_LINK
 FEATURE_NAMES += STENO
 FEATURE_NAMES += SWAP_HANDS
 FEATURE_NAMES += WATCHDOG
diff --git a/docs/unit_testing.md b/docs/unit_testing.md
index 7310da8d0b..47a1055796 100644
--- a/docs/unit_testing.md
+++ b/docs/unit_testing.md
@@ -20,12 +20,12 @@ One thing to remember, is that you have to append `extern "C"` around all of you
 
 ## Adding Tests for New or Existing Features
 
-If you want to unit test some feature, then take a look at the existing serial_link tests, in the `quantum/serial_link/tests folder`, and follow the steps below to create a similar structure.
+If you want to unit test a feature, take a look at some of the existing tests, for example those in the `quantum/sequencer/tests` folder. Then follow the steps below to create a similar structure.
 
 1. If it doesn't already exist, add a test subfolder to the folder containing the feature.
 2. Create a `testlist.mk` and a `rules.mk` file in that folder.
 3. Include those files from the root folder `testlist.mk`and `build_test.mk` respectively.
-4. Add a new name for your testgroup to the `testlist.mk` file. Each group defined there will be a separate executable. And that's how you can support mocking out different parts. Note that it's worth adding some common prefix, just like it's done for the serial_link tests. The reason for that is that the make command allows substring filtering, so this way you can easily run a subset of the tests.
+4. Add a new name for your testgroup to the `testlist.mk` file. Each group defined there will be a separate executable. And that's how you can support mocking out different parts. Note that it's worth adding some common prefix, just like it's done for the existing tests. The reason for that is that the make command allows substring filtering, so this way you can easily run a subset of the tests.
 5. Define the source files and required options in the `rules.mk` file.
    * `_SRC` for source files
    * `_DEFS` for additional defines
diff --git a/doxygen-todo b/doxygen-todo
index 54d7e9ef7b..4151627e4a 100644
--- a/doxygen-todo
+++ b/doxygen-todo
@@ -6,16 +6,8 @@ tmk_core/protocol/midi/bytequeue
 tmk_core/protocol/midi/Config
 tmk_core/protocol/usb_hid
 tmk_core/protocol/vusb
-tmk_core/tool
-tmk_core/tool/chibios
 quantum
-quantum/api
 quantum/audio
 quantum/keymap_extras
 quantum/process_keycode
-quantum/serial_link
-quantum/serial_link/protocol
-quantum/serial_link/system
-quantum/serial_link/tests
-quantum/tools
 drivers
diff --git a/keyboards/ergodox_infinity/ergodox_infinity.c b/keyboards/ergodox_infinity/ergodox_infinity.c
index d2a311ee8b..88028d3638 100644
--- a/keyboards/ergodox_infinity/ergodox_infinity.c
+++ b/keyboards/ergodox_infinity/ergodox_infinity.c
@@ -3,7 +3,6 @@
 #include <hal.h>
 #include <string.h>
 #include "eeconfig.h"
-#include "serial_link/system/serial_link.h"
 
 #define RED_PIN 1
 #define GREEN_PIN 2
diff --git a/quantum/keyboard.c b/quantum/keyboard.c
index c2e2234f94..ee7fa2bd4b 100644
--- a/quantum/keyboard.c
+++ b/quantum/keyboard.c
@@ -61,9 +61,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #ifdef STENO_ENABLE
 #    include "process_steno.h"
 #endif
-#ifdef SERIAL_LINK_ENABLE
-#    include "serial_link/system/serial_link.h"
-#endif
 #ifdef POINTING_DEVICE_ENABLE
 #    include "pointing_device.h"
 #endif
@@ -511,10 +508,6 @@ MATRIX_LOOP_END:
     adb_mouse_task();
 #endif
 
-#ifdef SERIAL_LINK_ENABLE
-    serial_link_update();
-#endif
-
 #ifdef POINTING_DEVICE_ENABLE
     pointing_device_task();
 #endif
diff --git a/quantum/sequencer/tests/rules.mk b/quantum/sequencer/tests/rules.mk
index 76c221cf92..87a204669c 100644
--- a/quantum/sequencer/tests/rules.mk
+++ b/quantum/sequencer/tests/rules.mk
@@ -1,5 +1,5 @@
 # The letter case of these variables might seem odd. However:
-# - it is consistent with the serial_link example that is used as a reference in the Unit Testing article (https://docs.qmk.fm/#/unit_testing?id=adding-tests-for-new-or-existing-features)
+# - it is consistent with the example that is used as a reference in the Unit Testing article (https://docs.qmk.fm/#/unit_testing?id=adding-tests-for-new-or-existing-features)
 # - Neither `make test:sequencer` or `make test:SEQUENCER` work when using SCREAMING_SNAKE_CASE
 
 sequencer_DEFS := -DNO_DEBUG -DMIDI_MOCKED
diff --git a/quantum/serial_link/LICENSE b/quantum/serial_link/LICENSE
deleted file mode 100644
index d13cc4b26a..0000000000
--- a/quantum/serial_link/LICENSE
+++ /dev/null
@@ -1,19 +0,0 @@
-The MIT License (MIT)
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
diff --git a/quantum/serial_link/README.md b/quantum/serial_link/README.md
deleted file mode 100644
index 05871dbdf7..0000000000
--- a/quantum/serial_link/README.md
+++ /dev/null
@@ -1 +0,0 @@
-# qmk_serial_link
diff --git a/quantum/serial_link/protocol/byte_stuffer.c b/quantum/serial_link/protocol/byte_stuffer.c
deleted file mode 100644
index d3a91d8286..0000000000
--- a/quantum/serial_link/protocol/byte_stuffer.c
+++ /dev/null
@@ -1,135 +0,0 @@
-/*
-The MIT License (MIT)
-
-Copyright (c) 2016 Fred Sundvik
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
-*/
-
-#include "serial_link/protocol/byte_stuffer.h"
-#include "serial_link/protocol/frame_validator.h"
-#include "serial_link/protocol/physical.h"
-#include <stdbool.h>
-
-// This implements the "Consistent overhead byte stuffing protocol"
-// https://en.wikipedia.org/wiki/Consistent_Overhead_Byte_Stuffing
-// http://www.stuartcheshire.org/papers/COBSforToN.pdf
-
-typedef struct byte_stuffer_state {
-    uint16_t next_zero;
-    uint16_t data_pos;
-    bool     long_frame;
-    uint8_t  data[MAX_FRAME_SIZE];
-} byte_stuffer_state_t;
-
-static byte_stuffer_state_t states[NUM_LINKS];
-
-void init_byte_stuffer_state(byte_stuffer_state_t* state) {
-    state->next_zero  = 0;
-    state->data_pos   = 0;
-    state->long_frame = false;
-}
-
-void init_byte_stuffer(void) {
-    int i;
-    for (i = 0; i < NUM_LINKS; i++) {
-        init_byte_stuffer_state(&states[i]);
-    }
-}
-
-void byte_stuffer_recv_byte(uint8_t link, uint8_t data) {
-    byte_stuffer_state_t* state = &states[link];
-    // Start of a new frame
-    if (state->next_zero == 0) {
-        state->next_zero  = data;
-        state->long_frame = data == 0xFF;
-        state->data_pos   = 0;
-        return;
-    }
-
-    state->next_zero--;
-    if (data == 0) {
-        if (state->next_zero == 0) {
-            // The frame is completed
-            if (state->data_pos > 0) {
-                validator_recv_frame(link, state->data, state->data_pos);
-            }
-        } else {
-            // The frame is invalid, so reset
-            init_byte_stuffer_state(state);
-        }
-    } else {
-        if (state->data_pos == MAX_FRAME_SIZE) {
-            // We exceeded our maximum frame size
-            // therefore there's nothing else to do than reset to a new frame
-            state->next_zero  = data;
-            state->long_frame = data == 0xFF;
-            state->data_pos   = 0;
-        } else if (state->next_zero == 0) {
-            if (state->long_frame) {
-                // This is part of a long frame, so continue
-                state->next_zero  = data;
-                state->long_frame = data == 0xFF;
-            } else {
-                // Special case for zeroes
-                state->next_zero               = data;
-                state->data[state->data_pos++] = 0;
-            }
-        } else {
-            state->data[state->data_pos++] = data;
-        }
-    }
-}
-
-static void send_block(uint8_t link, uint8_t* start, uint8_t* end, uint8_t num_non_zero) {
-    send_data(link, &num_non_zero, 1);
-    if (end > start) {
-        send_data(link, start, end - start);
-    }
-}
-
-void byte_stuffer_send_frame(uint8_t link, uint8_t* data, uint16_t size) {
-    const uint8_t zero = 0;
-    if (size > 0) {
-        uint16_t num_non_zero = 1;
-        uint8_t* end          = data + size;
-        uint8_t* start        = data;
-        while (data < end) {
-            if (num_non_zero == 0xFF) {
-                // There's more data after big non-zero block
-                // So send it, and start a new block
-                send_block(link, start, data, num_non_zero);
-                start        = data;
-                num_non_zero = 1;
-            } else {
-                if (*data == 0) {
-                    // A zero encountered, so send the block
-                    send_block(link, start, data, num_non_zero);
-                    start        = data + 1;
-                    num_non_zero = 1;
-                } else {
-                    num_non_zero++;
-                }
-                ++data;
-            }
-        }
-        send_block(link, start, data, num_non_zero);
-        send_data(link, &zero, 1);
-    }
-}
diff --git a/quantum/serial_link/protocol/byte_stuffer.h b/quantum/serial_link/protocol/byte_stuffer.h
deleted file mode 100644
index 397ed3baae..0000000000
--- a/quantum/serial_link/protocol/byte_stuffer.h
+++ /dev/null
@@ -1,34 +0,0 @@
-/*
-The MIT License (MIT)
-
-Copyright (c) 2016 Fred Sundvik
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
-*/
-
-#pragma once
-
-#include <stdint.h>
-
-#define MAX_FRAME_SIZE 1024
-#define NUM_LINKS 2
-
-void init_byte_stuffer(void);
-void byte_stuffer_recv_byte(uint8_t link, uint8_t data);
-void byte_stuffer_send_frame(uint8_t link, uint8_t* data, uint16_t size);
diff --git a/quantum/serial_link/protocol/frame_router.c b/quantum/serial_link/protocol/frame_router.c
deleted file mode 100644
index 5292673700..0000000000
--- a/quantum/serial_link/protocol/frame_router.c
+++ /dev/null
@@ -1,64 +0,0 @@
-/*
-The MIT License (MIT)
-
-Copyright (c) 2016 Fred Sundvik
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
-*/
-
-#include "serial_link/protocol/frame_router.h"
-#include "serial_link/protocol/transport.h"
-#include "serial_link/protocol/frame_validator.h"
-
-static bool is_master;
-
-void router_set_master(bool master) { is_master = master; }
-
-void route_incoming_frame(uint8_t link, uint8_t* data, uint16_t size) {
-    if (is_master) {
-        if (link == DOWN_LINK) {
-            transport_recv_frame(data[size - 1], data, size - 1);
-        }
-    } else {
-        if (link == UP_LINK) {
-            if (data[size - 1] & 1) {
-                transport_recv_frame(0, data, size - 1);
-            }
-            data[size - 1] >>= 1;
-            validator_send_frame(DOWN_LINK, data, size);
-        } else {
-            data[size - 1]++;
-            validator_send_frame(UP_LINK, data, size);
-        }
-    }
-}
-
-void router_send_frame(uint8_t destination, uint8_t* data, uint16_t size) {
-    if (destination == 0) {
-        if (!is_master) {
-            data[size] = 1;
-            validator_send_frame(UP_LINK, data, size + 1);
-        }
-    } else {
-        if (is_master) {
-            data[size] = destination;
-            validator_send_frame(DOWN_LINK, data, size + 1);
-        }
-    }
-}
diff --git a/quantum/serial_link/protocol/frame_router.h b/quantum/serial_link/protocol/frame_router.h
deleted file mode 100644
index 9325fe4eed..0000000000
--- a/quantum/serial_link/protocol/frame_router.h
+++ /dev/null
@@ -1,35 +0,0 @@
-/*
-The MIT License (MIT)
-
-Copyright (c) 2016 Fred Sundvik
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
-*/
-
-#pragma once
-
-#include <stdint.h>
-#include <stdbool.h>
-
-#define UP_LINK 0
-#define DOWN_LINK 1
-
-void router_set_master(bool master);
-void route_incoming_frame(uint8_t link, uint8_t* data, uint16_t size);
-void router_send_frame(uint8_t destination, uint8_t* data, uint16_t size);
diff --git a/quantum/serial_link/protocol/frame_validator.c b/quantum/serial_link/protocol/frame_validator.c
deleted file mode 100644
index bc9136f70b..0000000000
--- a/quantum/serial_link/protocol/frame_validator.c
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
-The MIT License (MIT)
-
-Copyright (c) 2016 Fred Sundvik
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
-*/
-
-#include "serial_link/protocol/frame_validator.h"
-#include "serial_link/protocol/frame_router.h"
-#include "serial_link/protocol/byte_stuffer.h"
-#include <string.h>
-
-const uint32_t poly8_lookup[256] = {0,          0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3, 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, 0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
-                                    0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433, 0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01, 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F, 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
-                                    0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, 0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B, 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
-                                    0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777, 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45, 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D};
-
-static uint32_t crc32_byte(uint8_t* p, uint32_t bytelength) {
-    uint32_t crc = 0xffffffff;
-    while (bytelength-- != 0) crc = poly8_lookup[((uint8_t)crc ^ *(p++))] ^ (crc >> 8);
-    // return (~crc); also works
-    return (crc ^ 0xffffffff);
-}
-
-void validator_recv_frame(uint8_t link, uint8_t* data, uint16_t size) {
-    if (size > 4) {
-        uint32_t frame_crc;
-        memcpy(&frame_crc, data + size - 4, 4);
-        uint32_t expected_crc = crc32_byte(data, size - 4);
-        if (frame_crc == expected_crc) {
-            route_incoming_frame(link, data, size - 4);
-        }
-    }
-}
-
-void validator_send_frame(uint8_t link, uint8_t* data, uint16_t size) {
-    uint32_t crc = crc32_byte(data, size);
-    memcpy(data + size, &crc, 4);
-    byte_stuffer_send_frame(link, data, size + 4);
-}
diff --git a/quantum/serial_link/protocol/frame_validator.h b/quantum/serial_link/protocol/frame_validator.h
deleted file mode 100644
index 0f78768a00..0000000000
--- a/quantum/serial_link/protocol/frame_validator.h
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
-The MIT License (MIT)
-
-Copyright (c) 2016 Fred Sundvik
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
-*/
-
-#pragma once
-
-#include <stdint.h>
-
-void validator_recv_frame(uint8_t link, uint8_t* data, uint16_t size);
-// The buffer pointed to by the data needs 4 additional bytes
-void validator_send_frame(uint8_t link, uint8_t* data, uint16_t size);
diff --git a/quantum/serial_link/protocol/physical.h b/quantum/serial_link/protocol/physical.h
deleted file mode 100644
index 399c9d1f76..0000000000
--- a/quantum/serial_link/protocol/physical.h
+++ /dev/null
@@ -1,27 +0,0 @@
-/*
-The MIT License (MIT)
-
-Copyright (c) 2016 Fred Sundvik
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
-*/
-
-#pragma once
-
-void send_data(uint8_t link, const uint8_t* data, uint16_t size);
diff --git a/quantum/serial_link/protocol/transport.c b/quantum/serial_link/protocol/transport.c
deleted file mode 100644
index 73b8dc62e9..0000000000
--- a/quantum/serial_link/protocol/transport.c
+++ /dev/null
@@ -1,121 +0,0 @@
-/*
-The MIT License (MIT)
-
-Copyright (c) 2016 Fred Sundvik
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND