diff --git a/.gitmodules b/.gitmodules
index 33769145b..5397a52d8 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -10,3 +10,6 @@
 [submodule "lib/mbedtls"]
 	path = lib/mbedtls
 	url = https://github.com/Mbed-TLS/mbedtls.git
+[submodule "lib/uzlib"]
+	path = lib/uzlib
+	url = git@github.com:pfalcon/uzlib.git
diff --git a/lib/uzlib b/lib/uzlib
new file mode 160000
index 000000000..6d60d651a
--- /dev/null
+++ b/lib/uzlib
@@ -0,0 +1 @@
+Subproject commit 6d60d651a4499a64f2e5b21b4cc08d98cb84b5c1
diff --git a/src/rp2_common/CMakeLists.txt b/src/rp2_common/CMakeLists.txt
index ff8df7c6b..f85a75f16 100644
--- a/src/rp2_common/CMakeLists.txt
+++ b/src/rp2_common/CMakeLists.txt
@@ -62,6 +62,7 @@ if (NOT PICO_BARE_METAL)
     pico_add_subdirectory(pico_lwip)
     pico_add_subdirectory(pico_cyw43_arch)
     pico_add_subdirectory(pico_mbedtls)
+    pico_add_subdirectory(pico_uzlib)
 
     pico_add_subdirectory(pico_stdlib)
 
@@ -79,4 +80,4 @@ set(CMAKE_EXECUTABLE_SUFFIX "${CMAKE_EXECUTABLE_SUFFIX}" PARENT_SCOPE)
 pico_add_doxygen(${CMAKE_CURRENT_LIST_DIR})
 pico_add_doxygen_exclude(${CMAKE_CURRENT_LIST_DIR}/cmsis)
 
-pico_promote_common_scope_vars()
\ No newline at end of file
+pico_promote_common_scope_vars()
diff --git a/src/rp2_common/cyw43_driver/CMakeLists.txt b/src/rp2_common/cyw43_driver/CMakeLists.txt
index 8951df400..2a623c0ac 100644
--- a/src/rp2_common/cyw43_driver/CMakeLists.txt
+++ b/src/rp2_common/cyw43_driver/CMakeLists.txt
@@ -5,6 +5,11 @@ endif()
 
 set(CYW43_DRIVER_TEST_FILE "src/cyw43.h")
 
+# Enable/disable streaming / compression of firmware
+if (NOT CYW43_DECOMPRESS_FIRMWARE)
+    set(CYW43_DECOMPRESS_FIRMWARE 1)
+endif()
+
 if (NOT PICO_CYW43_DRIVER_PATH)
     set(PICO_CYW43_DRIVER_PATH ${PICO_SDK_PATH}/lib/cyw43-driver)
     if (PICO_CYW43_SUPPORTED AND NOT EXISTS ${PICO_CYW43_DRIVER_PATH}/${CYW43_DRIVER_TEST_FILE})
@@ -32,34 +37,50 @@ if (EXISTS ${PICO_CYW43_DRIVER_PATH}/${CYW43_DRIVER_TEST_FILE})
             ${PICO_CYW43_DRIVER_PATH}/src
             ${PICO_CYW43_DRIVER_PATH}/firmware
             )
-
+    if (${CYW43_DECOMPRESS_FIRMWARE})
+        target_compile_definitions(cyw43_driver_base INTERFACE
+            CYW43_DECOMPRESS_FIRMWARE=1
+            )
+        target_sources(cyw43_driver_base INTERFACE
+            ${PICO_CYW43_DRIVER_PATH}/src/cyw43_decompress_firmware.c
+            )
+    endif()
     # Build the driver for cyw43 for pico w
 
     # Firmware stuff
-    set(CYW43_FIRMWARE_BIN 43439A0-7.95.49.00.combined)
-    string(REGEX REPLACE [\\\.\-] _ CYW43_FIRMWARE_BIN_ ${CYW43_FIRMWARE_BIN})
-    string(REGEX MATCH [^_]+_?[^_]*_?[^_]*_?[^_]*_?[^_]* CYW43_FIRMWARE_PRETTY ${CYW43_FIRMWARE_BIN_})
-    set(CYW43_FIRMWARE_PRETTY fw_${CYW43_FIRMWARE_PRETTY})
-    set(RESOURCE_SECNAME .big_const)
-    set(RESOURCE_SECFLAGS contents,alloc,load,readonly,data)
-    set(CYW43_FIRMWARE_OBJ ${CMAKE_CURRENT_BINARY_DIR}/cyw43_resource.o)
-
+    if (NOT CYW43_FIRMWARE_LOC)
+        set(CYW43_FIRMWARE_LOC ${PICO_CYW43_DRIVER_PATH}/firmware)
+    endif()
+    if (NOT CYW43_FIRMWARE_BIN)
+        set(CYW43_FIRMWARE_BIN "43439A0-7.95.49.00.combined")
+        set(CYW43_FIRMWARE_NAME "43439A0_7_95_49_00_combined")
+        set(CYW43_FIRMWARE_SYM ${CYW43_FIRMWARE_NAME})
+        if (${CYW43_DECOMPRESS_FIRMWARE})
+            set(CYW43_FIRMWARE_BIN "${CYW43_FIRMWARE_BIN}.gz")
+            set(CYW43_FIRMWARE_SYM "${CYW43_FIRMWARE_SYM}_gz")
+        endif()
+    endif()
+    if (NOT CYW43_FIRMWARE_NAME)
+        message(FATAL_ERROR "Please define CYW43_FIRMWARE_NAME")
+    endif()
+    if (NOT CYW43_FIRMWARE_OBJ)
+        # cyw43_resource.o contains the WiFi and BT firmware as a binary blob
+        set(CYW43_FIRMWARE_OBJ ${CMAKE_CURRENT_BINARY_DIR}/cyw43_resource.o)
+        add_custom_command(
+                OUTPUT ${CYW43_FIRMWARE_OBJ}
+                DEPENDS ${CYW43_FIRMWARE_LOC}/${CYW43_FIRMWARE_BIN}
+                WORKING_DIRECTORY ${CYW43_FIRMWARE_LOC}
+                COMMAND ${CMAKE_OBJCOPY} -I binary -O elf32-littlearm -B arm
+                --readonly-text
+                --rename-section .data=.big_const,contents,alloc,load,readonly,data
+                --redefine-sym _binary_${CYW43_FIRMWARE_SYM}_start=fw_${CYW43_FIRMWARE_NAME}_start
+                --redefine-sym _binary_${CYW43_FIRMWARE_SYM}_end=fw_${CYW43_FIRMWARE_NAME}_end
+                --redefine-sym _binary_${CYW43_FIRMWARE_SYM}_size=fw_${CYW43_FIRMWARE_NAME}_size
+                ${CYW43_FIRMWARE_BIN} ${CYW43_FIRMWARE_OBJ}
+        )
+    endif()
     add_custom_target(cyw43_firmware_package DEPENDS ${CYW43_FIRMWARE_OBJ})
 
-    # cyw43_resource.o contains the WiFi and BT firmware as a binary blob
-    add_custom_command(
-            OUTPUT ${CYW43_FIRMWARE_OBJ}
-            DEPENDS ${PICO_CYW43_DRIVER_PATH}/firmware/${CYW43_FIRMWARE_BIN}
-            WORKING_DIRECTORY ${PICO_CYW43_DRIVER_PATH}/firmware
-            COMMAND ${CMAKE_OBJCOPY} -I binary -O elf32-littlearm -B arm
-            --readonly-text
-            --rename-section .data=${RESOURCE_SECNAME},${RESOURCE_SECFLAGS}
-            --redefine-sym _binary_${CYW43_FIRMWARE_BIN_}_start=${CYW43_FIRMWARE_PRETTY}_start
-            --redefine-sym _binary_${CYW43_FIRMWARE_BIN_}_end=${CYW43_FIRMWARE_PRETTY}_end
-            --redefine-sym _binary_${CYW43_FIRMWARE_BIN_}_size=${CYW43_FIRMWARE_PRETTY}_size
-            ${CYW43_FIRMWARE_BIN} ${CYW43_FIRMWARE_OBJ}
-    )
-
     add_library(cyw43_driver_picow INTERFACE)
     target_sources(cyw43_driver_picow INTERFACE
             ${CMAKE_CURRENT_LIST_DIR}/cyw43_bus_pio_spi.c
@@ -69,13 +90,16 @@ if (EXISTS ${PICO_CYW43_DRIVER_PATH}/${CYW43_DRIVER_TEST_FILE})
     target_link_libraries(cyw43_driver_picow INTERFACE
             ${CYW43_FIRMWARE_OBJ}
             )
+    target_include_directories(cyw43_driver_picow INTERFACE
+            $(CYW43_FIRMWARE_LOC) # contains a header file with firmware details
+            )
     target_link_libraries(cyw43_driver_picow INTERFACE
             cyw43_driver_base
             pico_stdlib
             hardware_pio
             hardware_dma
             hardware_exception
+            pico_uzlib
             )
-
     pico_promote_common_scope_vars()
 endif()
diff --git a/src/rp2_common/cyw43_driver/cyw43_bus_pio_spi.c b/src/rp2_common/cyw43_driver/cyw43_bus_pio_spi.c
index 21af77de2..becd65004 100644
--- a/src/rp2_common/cyw43_driver/cyw43_bus_pio_spi.c
+++ b/src/rp2_common/cyw43_driver/cyw43_bus_pio_spi.c
@@ -477,10 +477,6 @@ int cyw43_write_reg_u8(cyw43_int_t *self, uint32_t fn, uint32_t reg, uint32_t va
     return _cyw43_write_reg(self, fn, reg, val, 1);
 }
 
-#if MAX_BLOCK_SIZE > 0x7f8
-#error Block size is wrong for SPI
-#endif
-
 // Assumes we're reading into spid_buf
 int cyw43_read_bytes(cyw43_int_t *self, uint32_t fn, uint32_t addr, size_t len, uint8_t *buf) {
     assert(fn != BACKPLANE_FUNCTION || (len <= 64 && (addr + len) <= 0x8000));
@@ -535,9 +531,14 @@ int cyw43_write_bytes(cyw43_int_t *self, uint32_t fn, uint32_t addr, size_t len,
         int res = cyw43_spi_transfer(self, (uint8_t *)&self->spi_header[1], aligned_len + 4, NULL, 0);
         logic_debug_set(pin_WIFI_TX, 0);
         return res;
+    } else if (src > self->spid_buf + sizeof(uint32_t) && src < (self->spid_buf + sizeof(self->spid_buf))) {
+        assert(src + len <= (self->spid_buf + sizeof(self->spid_buf))); // don't go over the end of the buffer
+        uint32_t *spi_header = (void*)(self->spid_buf + (src - self->spid_buf) - sizeof(uint32_t));
+        *spi_header = make_cmd(true, true, fn, addr, len);
+        return cyw43_spi_transfer(self, (uint8_t *)spi_header, aligned_len + 4, NULL, 0);
     } else {
         // todo: would be nice to get rid of this. Only used for firmware download?
-        assert(src < self->spid_buf || src >= (self->spid_buf + sizeof(self->spid_buf)));
+        assert(src < self->spid_buf || src >= (self->spid_buf + sizeof(self->spid_buf))); // check we're not using self->spid_buf
         self->spi_header[1] = make_cmd(true, true, fn, addr, len);
         memcpy(self->spid_buf, src, len);
         return cyw43_spi_transfer(self, (uint8_t *)&self->spi_header[1], aligned_len + 4, NULL, 0);
diff --git a/src/rp2_common/pico_lwip/include/arch/cc.h b/src/rp2_common/pico_lwip/include/arch/cc.h
index 8194dcb41..b8b76f559 100644
--- a/src/rp2_common/pico_lwip/include/arch/cc.h
+++ b/src/rp2_common/pico_lwip/include/arch/cc.h
@@ -70,7 +70,7 @@ typedef int sys_prot_t;
 #endif
 
 #ifndef LWIP_PLATFORM_ASSERT
-void panic(const char *fmt, ...);
+#include "pico/platform.h"
 #define LWIP_PLATFORM_ASSERT(x) panic(x)
 #endif
 
diff --git a/src/rp2_common/pico_uzlib/CMakeLists.txt b/src/rp2_common/pico_uzlib/CMakeLists.txt
new file mode 100644
index 000000000..4ed67b221
--- /dev/null
+++ b/src/rp2_common/pico_uzlib/CMakeLists.txt
@@ -0,0 +1,42 @@
+set(UZLIB_TEST_PATH "src/tinflate.c")
+if (NOT PICO_UZLIB_PATH)
+    set(PICO_UZLIB_PATH ${PROJECT_SOURCE_DIR}/lib/uzlib)
+endif()
+if (NOT EXISTS ${PICO_UZLIB_PATH}/${UZLIB_TEST_PATH})
+    message(WARNING "uzlib content not present.")
+endif()
+
+if (EXISTS ${PICO_UZLIB_PATH}/${UZLIB_TEST_PATH})
+    message("uzlib available at ${PICO_UZLIB_PATH}")
+
+    pico_register_common_scope_var(PICO_UZLIB_PATH)
+
+    add_library(pico_uzlib INTERFACE)
+    target_sources(pico_uzlib INTERFACE
+        ${PICO_UZLIB_PATH}/src/tinflate.c
+        ${PICO_UZLIB_PATH}/src/tinfgzip.c
+        ${PICO_UZLIB_PATH}/src/tinfzlib.c
+        ${PICO_UZLIB_PATH}/src/adler32.c
+        ${PICO_UZLIB_PATH}/src/crc32.c
+        ${PICO_UZLIB_PATH}/src/defl_static.c
+    )
+    target_include_directories(pico_uzlib INTERFACE
+        ${PICO_UZLIB_PATH}/src
+    )
+
+    pico_promote_common_scope_vars()
+
+    function(suppress_uzlib_warnings)
+        set_source_files_properties(
+            ${PICO_UZLIB_PATH}/src/defl_static.c
+            PROPERTIES
+            COMPILE_OPTIONS "-Wno-redundant-decls"
+            )
+        set_source_files_properties(
+            ${PICO_UZLIB_PATH}/src/tinflate.c
+            PROPERTIES
+            COMPILE_OPTIONS "-Wno-sign-compare"
+            )
+    endfunction()
+
+endif()
\ No newline at end of file
diff --git a/test/kitchen_sink/CMakeLists.txt b/test/kitchen_sink/CMakeLists.txt
index 4c0a60d65..ba3a3e9f6 100644
--- a/test/kitchen_sink/CMakeLists.txt
+++ b/test/kitchen_sink/CMakeLists.txt
@@ -40,6 +40,7 @@ target_link_libraries(kitchen_sink_libs INTERFACE
     pico_time
     pico_unique_id
     pico_util
+    pico_uzlib
 )
 
 add_library(kitchen_sink_options INTERFACE)
@@ -152,3 +153,7 @@ if (TARGET pico_cyw43_arch)
         suppress_mbedtls_warnings()
     endif()
 endif()
+
+if (TARGET pico_uzlib AND COMMAND suppress_uzlib_warnings)
+    suppress_uzlib_warnings()
+endif()