ethernet: can build without enable esp32 emac

Closes https://github.com/espressif/esp-idf/issues/3770

components/esp_eth/CMakeLists.txt

@@ -4,7 +4,7 @@ set(esp_eth_srcs "src/esp_eth.c"
                  "src/esp_eth_phy_lan8720.c"
                  "src/esp_eth_phy_rtl8201.c")
 
-if(CONFIG_IDF_TARGET_ESP32)
+if(CONFIG_ETH_USE_ESP32_EMAC)
     list(APPEND esp_eth_srcs "src/esp_eth_mac_esp32.c")
 endif()
 

components/esp_eth/component.mk

@@ -5,7 +5,7 @@ COMPONENT_ADD_INCLUDEDIRS := include
 COMPONENT_SRCDIRS := src
 COMPONENT_ADD_LDFRAGMENTS += linker.lf
 
-ifndef CONFIG_IDF_TARGET_ESP32
+ifndef CONFIG_ETH_USE_ESP32_EMAC
     COMPONENT_OBJEXCLUDE += src/esp_eth_mac_esp32.o
 endif
 

components/soc/esp32/component.mk

@@ -1 +1,5 @@
+ifndef CONFIG_ETH_USE_ESP32_EMAC
+    COMPONENT_OBJEXCLUDE += esp32/emac_hal.o
+endif
+
 esp32/rtc_clk.o: CFLAGS += -fno-jump-tables -fno-tree-switch-conversion

components/soc/esp32/sources.cmake

@@ -13,7 +13,7 @@ set(SOC_SRCS "cpu_util.c"
     "soc_memory_layout.c"
     "spi_periph.c")
 
-if(NOT BOOTLOADER_BUILD)
+if(NOT BOOTLOADER_BUILD AND CONFIG_ETH_USE_ESP32_EMAC)
     list(APPEND SOC_SRCS "emac_hal.c")
 endif()
 

components/soc/linker.lf

@@ -14,9 +14,10 @@ entries:
     spi_slave_hal_iram (noflash_text)
     spi_flash_hal_iram (noflash)
     lldesc (noflash_text)
-    emac_hal:emac_hal_isr (noflash_text)
-    emac_hal:emac_hal_tx_complete_cb (noflash_text)
-    emac_hal:emac_hal_tx_unavail_cb (noflash_text)
-    emac_hal:emac_hal_rx_complete_cb (noflash_text)
-    emac_hal:emac_hal_rx_early_cb (noflash_text)
-    emac_hal:emac_hal_rx_unavail_cb (noflash_text)
+    if ETH_USE_ESP32_EMAC = y:
+        emac_hal:emac_hal_isr (noflash_text)
+        emac_hal:emac_hal_tx_complete_cb (noflash_text)
+        emac_hal:emac_hal_tx_unavail_cb (noflash_text)
+        emac_hal:emac_hal_rx_complete_cb (noflash_text)
+        emac_hal:emac_hal_rx_early_cb (noflash_text)
+        emac_hal:emac_hal_rx_unavail_cb (noflash_text)