siflower: new target for Siflower SF19A2890

Siflower SF19A2890 is an SoC with:
Dual-core MIPS InterAptiv at 800MHz
DDR3 controller
One Gigabit Ethernet MAC with RGMII and IPv4 HNAT engine
Built-in 2x2 11N + 2x2 11AC WiFi radio
USB 2.0 OTG
I2C/SPI/GPIO and various other peripherals

This PR adds support for SF19A2890 EVB with ethernet support.

EVB spec:
Memory: DDR3 128M
Ethernet: RTL8367RB 5-port gigabit switch
Flash: 16M NOR
Others: MicroUSB OTG, LED x 1, Reset button x1

The built image can be flashed using u-boot recovery.

This target is marked as source-only until support for a commercial
router board comes.

Signed-off-by: Chuanhong Guo <[email protected]>

target/linux/siflower/Makefile

@@ -0,0 +1,18 @@
+# SPDX-License-Identifier: GPL-2.0-only
+include $(TOPDIR)/rules.mk
+
+ARCH:=mipsel
+BOARD:=siflower
+BOARDNAME:=Siflower SoCs
+FEATURES:=squashfs usb usbgadget source-only
+SUBTARGETS:=sf19a2890
+
+KERNEL_PATCHVER:=6.6
+
+include $(INCLUDE_DIR)/target.mk
+
+DEFAULT_PACKAGES += \
+	kmod-gpio-button-hotplug \
+	uboot-envtools
+
+$(eval $(call BuildTarget))