WIP: esp32c6: add ESP32-C6 platform support and loopback test suite

app/boards/esp32c6_devkitc_esp32c6_hpcore.conf

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+# Target Platform & SOF Core
+CONFIG_PLATFORM_ESP32C6=y
+CONFIG_IPC_MAJOR_4=y
+CONFIG_STATIC_PIPELINE=y
+CONFIG_SOF_FULL_ZEPHYR_APPLICATION=y
+CONFIG_ZEPHYR_NATIVE_DRIVERS=y
+CONFIG_BUILD_OUTPUT_BIN=y
+
+# Zephyr DAI Drivers for ESP32
+CONFIG_DAI=y
+CONFIG_DAI_ESPRESSIF_I2S=y
+CONFIG_PINCTRL=y
+CONFIG_DMA=y
+CONFIG_DMA_ESP32_MAX_DESCRIPTOR_NUM=32
+
+# Audio Processing Modules (Fixed-Point S16_LE Only - No Float / SIMD)
+CONFIG_FORMAT_S16LE=y
+CONFIG_COMP_VOLUME=y
+CONFIG_COMP_USB_AUDIO=y
+CONFIG_COMP_BT_AUDIO=n
+CONFIG_FILTER_RISCV_SIMD=n
+CONFIG_DRC_RISCV_SIMD=n
+CONFIG_EQ_IIR_RISCV_SIMD=n
+CONFIG_VOLUME_RISCV_SIMD=n
+CONFIG_COMP_DRC=n
+CONFIG_COMP_IIR=n
+CONFIG_COMP_FIR=n
+CONFIG_COMP_CROSSOVER=n
+CONFIG_COMP_DCBLOCK=n
+CONFIG_COMP_MULTIBAND_DRC=n
+CONFIG_COMP_TDFB=n
+
+# No Native USB UAC2 (ESP32-C6 uses USB-Serial/JTAG CDC-ACM)
+CONFIG_USB_DEVICE_STACK_NEXT=n
+CONFIG_USBD_AUDIO2_CLASS=n
+
+# System Resources & Memory (SRAM Budget: 512 KB)
+CONFIG_MAIN_STACK_SIZE=3072
+CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=3072
+CONFIG_ISR_STACK_SIZE=2048
+CONFIG_HW_STACK_PROTECTION=n
+CONFIG_HEAP_MEM_POOL_SIZE=8192
+CONFIG_TICKLESS_KERNEL=n
+CONFIG_SYS_CLOCK_TICKS_PER_SEC=1000
+
+# Logging & USB-Serial Console
+CONFIG_LOG=y
+CONFIG_LOG_DEFAULT_LEVEL=3
+CONFIG_LOG_MAX_LEVEL=4
+CONFIG_SOF_LOG_LEVEL_INF=y
+CONFIG_DAI_LOG_LEVEL_INF=y
+CONFIG_LOG_MODE_DEFERRED=y
+CONFIG_LOG_BUFFER_SIZE=2048
+CONFIG_LOG_MODE_OVERFLOW=y
+CONFIG_PRINTK=y
+CONFIG_LOG_PRINTK=n
+CONFIG_EARLY_CONSOLE=y
+
+# Interactive Shell over USB-Serial/JTAG
+CONFIG_SHELL=y
+CONFIG_SHELL_STACK_SIZE=4096
+CONFIG_SHELL_BACKENDS=y
+CONFIG_SHELL_BACKEND_SERIAL=y
+CONFIG_SHELL_PROMPT_UART="sof:~$ "
+
+# SOF Low Latency Scheduler Statistics Logging (Every 1s)
+CONFIG_SCHEDULE_LL_STATS_LOG=y
+CONFIG_SCHEDULE_LL_STATS_LOG_EVERY_OTHER_WINDOW=n
+CONFIG_SCHEDULE_LL_STATS_LOG_WINDOW_SIZE=10

app/boards/esp32c6_devkitc_esp32c6_hpcore.overlay

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+#include <zephyr/dt-bindings/interrupt-controller/esp-esp32c6-intmux.h>
+
+/ {
+	chosen {
+		zephyr,console = &usb_serial;
+		zephyr,shell-uart = &usb_serial;
+	};
+
+	dai_i2s0: dai@6000c000 {
+		compatible = "espressif,esp32-dai-i2s";
+		status = "okay";
+		reg = <0x6000c000 0x1000>;
+		interrupt-parent = <&intc>;
+		interrupts = <I2S1_INTR_SOURCE IRQ_DEFAULT_PRIORITY 0>;
+		dai-index = <0>;
+		fifo-depth = <32>;
+	};
+};
+
+&dma {
+	status = "okay";
+};
+
+&usb_serial {
+	status = "okay";
+};
+
+&i2c0 {
+	status = "disabled";
+};
+
+&uart0 {
+	status = "disabled";
+};

app/boards/xiao_esp32c6_esp32c6_hpcore.conf

@@ -0,0 +1,69 @@
+# Target Platform & SOF Core
+CONFIG_PLATFORM_ESP32C6=y
+CONFIG_IPC_MAJOR_4=y
+CONFIG_STATIC_PIPELINE=y
+CONFIG_SOF_FULL_ZEPHYR_APPLICATION=y
+CONFIG_ZEPHYR_NATIVE_DRIVERS=y
+CONFIG_BUILD_OUTPUT_BIN=y
+
+# Zephyr DAI Drivers for ESP32
+CONFIG_DAI=y
+CONFIG_DAI_ESPRESSIF_I2S=y
+CONFIG_PINCTRL=y
+CONFIG_DMA=y
+CONFIG_DMA_ESP32_MAX_DESCRIPTOR_NUM=32
+
+# Audio Processing Modules (Fixed-Point S16_LE Only - No Float / SIMD)
+CONFIG_FORMAT_S16LE=y
+CONFIG_COMP_VOLUME=y
+CONFIG_COMP_USB_AUDIO=y
+CONFIG_COMP_BT_AUDIO=n
+CONFIG_FILTER_RISCV_SIMD=n
+CONFIG_DRC_RISCV_SIMD=n
+CONFIG_EQ_IIR_RISCV_SIMD=n
+CONFIG_VOLUME_RISCV_SIMD=n
+CONFIG_COMP_DRC=n
+CONFIG_COMP_IIR=n
+CONFIG_COMP_FIR=n
+CONFIG_COMP_CROSSOVER=n
+CONFIG_COMP_DCBLOCK=n
+CONFIG_COMP_MULTIBAND_DRC=n
+CONFIG_COMP_TDFB=n
+
+# No Native USB UAC2 (ESP32-C6 uses USB-Serial/JTAG CDC-ACM)
+CONFIG_USB_DEVICE_STACK_NEXT=n
+CONFIG_USBD_AUDIO2_CLASS=n
+
+# System Resources & Memory (SRAM Budget: 512 KB)
+CONFIG_MAIN_STACK_SIZE=3072
+CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=3072
+CONFIG_ISR_STACK_SIZE=2048
+CONFIG_HW_STACK_PROTECTION=n
+CONFIG_HEAP_MEM_POOL_SIZE=8192
+CONFIG_TICKLESS_KERNEL=n
+CONFIG_SYS_CLOCK_TICKS_PER_SEC=1000
+
+# Logging & USB-Serial Console
+CONFIG_LOG=y
+CONFIG_LOG_DEFAULT_LEVEL=3
+CONFIG_LOG_MAX_LEVEL=4
+CONFIG_SOF_LOG_LEVEL_INF=y
+CONFIG_DAI_LOG_LEVEL_INF=y
+CONFIG_LOG_MODE_DEFERRED=y
+CONFIG_LOG_BUFFER_SIZE=2048
+CONFIG_LOG_MODE_OVERFLOW=y
+CONFIG_PRINTK=y
+CONFIG_LOG_PRINTK=n
+CONFIG_EARLY_CONSOLE=y
+
+# Interactive Shell over USB-Serial/JTAG
+CONFIG_SHELL=y
+CONFIG_SHELL_STACK_SIZE=4096
+CONFIG_SHELL_BACKENDS=y
+CONFIG_SHELL_BACKEND_SERIAL=y
+CONFIG_SHELL_PROMPT_UART="sof:~$ "
+
+# SOF Low Latency Scheduler Statistics Logging (Every 1s)
+CONFIG_SCHEDULE_LL_STATS_LOG=y
+CONFIG_SCHEDULE_LL_STATS_LOG_EVERY_OTHER_WINDOW=n
+CONFIG_SCHEDULE_LL_STATS_LOG_WINDOW_SIZE=10

app/boards/xiao_esp32c6_esp32c6_hpcore.overlay

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+#include <zephyr/dt-bindings/interrupt-controller/esp-esp32c6-intmux.h>
+
+/ {
+	chosen {
+		zephyr,console = &usb_serial;
+		zephyr,shell-uart = &usb_serial;
+	};
+
+	dai_i2s0: dai@6000c000 {
+		compatible = "espressif,esp32-dai-i2s";
+		status = "okay";
+		reg = <0x6000c000 0x1000>;
+		interrupt-parent = <&intc>;
+		interrupts = <I2S1_INTR_SOURCE IRQ_DEFAULT_PRIORITY 0>;
+		dai-index = <0>;
+		fifo-depth = <32>;
+	};
+};
+
+&dma {
+	status = "okay";
+};
+
+&usb_serial {
+	status = "okay";
+};
+
+&i2c0 {
+	status = "disabled";
+};
+
+&spi2 {
+	status = "disabled";
+};
+
+&uart0 {
+	status = "disabled";
+};