Initial start of supporting the sj201

This pulls in the XMOS sources, cross compiles the kernel module
and setup_clk_x binaries and install them into the target overlay

buildroot-external/Config.in

@@ -89,6 +89,7 @@ endmenu
 	source "$BR2_EXTERNAL_OPENVOICEOS_PATH/package/userland-tools/Config.in"
 	source "$BR2_EXTERNAL_OPENVOICEOS_PATH/package/virtual-touch/Config.in"
 	source "$BR2_EXTERNAL_OPENVOICEOS_PATH/package/wifi-connect/Config.in"
+	source "$BR2_EXTERNAL_OPENVOICEOS_PATH/package/xvf3510/Config.in"
 endmenu
 menu "Additional external python modules"
 	source "$BR2_EXTERNAL_OPENVOICEOS_PATH/package/python-adapt-parser/Config.in"

buildroot-external/configs/rpi4_64-gui_defconfig

@@ -540,6 +540,7 @@ BR2_PACKAGE_SNAPCAST_SERVER=y
 BR2_PACKAGE_SPOTIFYD=y
 BR2_PACKAGE_USERLAND_TOOLS=y
 BR2_PACKAGE_WIFI_CONNECT=y
+BR2_PACKAGE_XVF3510=y
 BR2_PACKAGE_PYTHON_ADAPT_PARSER=y
 BR2_PACKAGE_PYTHON_ASTRAL=y
 BR2_PACKAGE_PYTHON_COLOUR=y

buildroot-external/package/xvf3510/0001-Patch-clk_dac_setup-Makefile-to-honour-cross-compili.patch

@@ -0,0 +1,31 @@
+From 9e8e51e22890b6b61672ef08976c91cd8ea73a86 Mon Sep 17 00:00:00 2001
+From: j1nx <p.steenbergen@j1nx.nl>
+Date: Wed, 14 Apr 2021 17:27:34 +0200
+Subject: [PATCH 1/1] Patch clk_dac_setup Makefile to honour cross compiling
+
+---
+ resources/clk_dac_setup/Makefile | 6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+diff --git a/resources/clk_dac_setup/Makefile b/resources/clk_dac_setup/Makefile
+index 24c7ec0..2f73c18 100644
+--- a/resources/clk_dac_setup/Makefile
++++ b/resources/clk_dac_setup/Makefile
+@@ -1,10 +1,12 @@
++CC = gcc
++
+ default: bclk mclk
+ 
+ bclk: setup_mclk_bclk.c
+-	gcc -g -o setup_bclk setup_mclk_bclk.c
++	$(CC) -g -o setup_bclk setup_mclk_bclk.c
+ 
+ mclk: setup_mclk_bclk.c
+-	gcc -g -DMCLK -o setup_mclk setup_mclk_bclk.c
++	$(CC) -g -DMCLK -o setup_mclk setup_mclk_bclk.c
+ 
+ clean:
+ 	rm -f setup_mclk
+-- 
+2.20.1
+

buildroot-external/package/xvf3510/Config.in

@@ -0,0 +1,10 @@
+config BR2_PACKAGE_XVF3510
+	bool "xvf3510"
+	help
+	  xCORE VocalFusion Raspberry Pi
+	  drivers and tools to support the
+	  sj201 daughterboard used in the 
+	  Mark2.
+
+	  https://github.com/xmos/vocalfusion-rpi-setup/
+

buildroot-external/package/xvf3510/xvf3510.hash

@@ -0,0 +1,2 @@
+# Locally computed
+sha256  12b2b3c16e208791b1ead0562bae34d7345db8778e4702e5bd782aa0622cb404  xvf3510-4cfcc2c418ac0076277b11aa9e410816a62ce673.tar.gz

buildroot-external/package/xvf3510/xvf3510.mk

@@ -0,0 +1,33 @@
+################################################################################
+#
+# xvf3510
+#
+################################################################################
+
+XVF3510_VERSION = 4cfcc2c418ac0076277b11aa9e410816a62ce673
+XVF3510_SITE = $(call github,xmos,vocalfusion-rpi-setup,$(XVF3510_VERSION))
+XVF3510_MODULE_SUBDIRS = loader/i2s_master
+XVF3510_MODULE_MAKE_OPTS = CFLAGS_MODULE="-DRPI_4B -DI2S_MASTER" \
+	KVER=$(LINUX_VERSION_PROBED) \
+	KSRC=$(LINUX_DIR)
+
+XVF3510_POST_EXTRACT_HOOKS = XVF3510_MOVE_SRC_FILE
+
+define XVF3510_MOVE_SRC_FILE
+	cp $(@D)/loader/src/loader.c $(@D)/loader/i2s_master/i2s_master_loader.c
+endef
+
+$(eval $(kernel-module))
+
+define XVF3510_BUILD_CMDS
+	$(MAKE) CC="$(TARGET_CC)" LD="$(TARGET_LD)" -C $(@D)/resources/clk_dac_setup default
+endef
+
+define XVF3510_INSTALL_TARGET_CMDS
+	$(INSTALL) -D -m 0755 $(@D)/resources/clk_dac_setup/setup_bclk \
+		$(TARGET_DIR)/usr/bin
+	$(INSTALL) -D -m 0755 $(@D)/resources/clk_dac_setup/setup_mclk \
+		$(TARGET_DIR)/usr/bin
+endef
+
+$(eval $(generic-package))