Initial import of NFC GNSS SDK project

ql-config/soc_platform/preboot_boot2/makefiles/arch/riscv.inc.mk

@@ -0,0 +1,54 @@
+# Target triple for the build. Use riscv-none-elf if you are unsure.
+export TARGET_ARCH ?= riscv-none-elf
+
+export CFLAGS_LINK  = -ffunction-sections -fdata-sections -fno-builtin -fshort-enums
+export CFLAGS_DBG  ?= -ggdb -g
+export CFLAGS_OPT  ?= -Os
+export CPU_ARCH = riscv
+
+export CFLAGS += $(CFLAGS_CPU) $(CFLAGS_LINK) $(CFLAGS_DBG) $(CFLAGS_OPT)
+
+export ASFLAGS += $(CFLAGS_CPU) $(CFLAGS_DBG)
+export LINKER_SCRIPT ?= $(LDSCRIPT)
+export LINKFLAGS += -T$(LINKER_SCRIPT) -Wl,--fatal-warnings
+
+export LINKFLAGS += $(CFLAGS_CPU) $(CFLAGS_DBG) $(CFLAGS_OPT) -static -lgcc -nostartfiles
+export LINKFLAGS += -Wl,--gc-sections -Wl,--no-warn-rwx-segments -Wl,--no-warn-mismatch
+
+# all cortex MCU's use newlib as libc
+export USEMODULE += newlib
+
+# set default for CPU_MODEL
+export CPU_MODEL ?= $(CPU)
+
+# export the CPU model and architecture
+MODEL = $(shell echo $(CPU_MODEL) | tr 'a-z' 'A-Z')
+export CFLAGS += -DCPU_MODEL_$(MODEL)
+ARCH = $(shell echo $(CPU_ARCH) | tr 'a-z-+' 'A-Z__')
+export CFLAGS += -DCPU_ARCH_$(ARCH)
+
+# set the compiler specific CPU and FPU options
+export MCPU ?= $(CPU_ARCH)
+
+export SOURCE_LDSCRIPT = $(RIOTCPU)/$(CPU)/ldscripts/$(LINKER_SOURCE_SCRIPT)
+$(inifo $(SOURCE_LDSCRIPT))
+export LDSCRIPT = $(BINDIR)/$(CPU_MODEL).ld
+
+# use the nano-specs of Newlib when available
+USEMODULE += newlib_nano
+export USE_NANO_SPECS = 1
+
+# Avoid overriding the default rule:
+all:
+
+# Rule to generate assembly listings from ELF files:
+%.lst: %.elf
+	$(OBJDUMP) $(OBJDUMPFLAGS) $< > $@
+
+### This rule is used to generate the correct linker script
+LDGENFLAGS += $(CFLAGS)
+LDGENFLAGS += -x c -P -E
+
+# NB: Assumes LDSCRIPT was not overridden and is in $(OBJECTDIR)
+$(LDSCRIPT): $(SOURCE_LDSCRIPT) $(RIOTBUILD_CONFIG_HEADER_C) | $(BINDIR)
+	$(Q)$(CC) $(LDGENFLAGS) $< | grep -v '^\s*#\s*pragma\>' > $@