Split RISC-V targets into 32/64-bit

targets/fe310.json

@@ -1,19 +1,5 @@
 {
 	"inherits": ["riscv32"],
 	"features": ["+a", "+c", "+m"],
-	"build-tags": ["fe310", "sifive"],
-	"llvm-target": "riscv32--none",
-	"cflags": [
-		"--target=riscv32--none",
-		"-march=rv32imac",
-		"-mabi=ilp32",
-		"-Os",
-		"-Werror",
-		"-fno-exceptions", "-fno-unwind-tables",
-		"-ffunction-sections", "-fdata-sections"
-	],
-	"ldflags": [
-		"-melf32lriscv",
-		"--gc-sections"
-	]
+	"build-tags": ["fe310", "sifive"]	
 }

targets/k210.json

@@ -1,19 +1,5 @@
 {
-	"inherits": ["riscv"],
+	"inherits": ["riscv64"],
 	"features": ["+a", "+c", "+m", "+f", "+d"],
-	"build-tags": ["k210", "kendryte"],
-	"llvm-target": "riscv64--none",
-	"cflags": [
-		"--target=riscv64--none",
-		"-march=rv64gc",
-		"-mabi=lp64d",
-		"-Os",
-		"-Werror",
-		"-fno-exceptions", "-fno-unwind-tables",
-		"-ffunction-sections", "-fdata-sections"
-	],
-	"ldflags": [
-		"-melf64lriscv",
-		"--gc-sections"
-	]
+	"build-tags": ["k210", "kendryte"]
 }

targets/maix-bit-mic.json

@@ -1,6 +0,0 @@
-{
-	"inherits": ["k210"],
-	"build-tags": ["maix-bit-mic"],
-	"linkerscript": "targets/maix-bit-mic.ld",
-	"flash-command": "kflash -p /dev/ttyUSB0 {hex}"
-}

targets/maix-bit-mic.ld

@@ -1,10 +0,0 @@
-
-MEMORY
-{
-    FLASH_TEXT (rw) : ORIGIN = 0x80000000, LENGTH = (6 * 1024 * 1024)
-    RAM (xrw)       : ORIGIN = 0x80000000, LENGTH = (6 * 1024 * 1024)
-}
-
-_stack_size = 2K;
-
-INCLUDE "targets/riscv.ld"

targets/maixbit.json

@@ -0,0 +1,6 @@
+{
+	"inherits": ["k210"],
+	"build-tags": ["maixbit"],
+	"linkerscript": "targets/maixbit.ld",
+	"flash-command": "kflash -p /dev/ttyUSB0 {hex}"
+}

targets/maixbit.ld

@@ -0,0 +1,11 @@
+
+MEMORY
+{
+    RAM (xrw) : ORIGIN = 0xffffffff80000000, LENGTH = 6M
+}
+
+REGION_ALIAS("FLASH_TEXT", RAM);
+
+_stack_size = 2K;
+
+INCLUDE "targets/riscv.ld"

targets/riscv.json

@@ -1,24 +0,0 @@
-{
-	"goos": "linux",
-	"goarch": "arm",
-	"build-tags": ["tinygo.riscv", "baremetal", "linux", "arm"],
-	"gc": "conservative",
-	"compiler": "clang",
-	"linker": "ld.lld",
-	"rtlib": "compiler-rt",
-	"libc": "picolibc",
-	"cflags": [
-		"-Os",
-		"-Werror",
-		"-fno-exceptions", "-fno-unwind-tables",
-		"-ffunction-sections", "-fdata-sections"
-	],
-	"ldflags": [
-		"--gc-sections"
-	],
-	"extra-files": [
-		"src/device/riscv/start.S",
-		"src/runtime/scheduler_tinygoriscv.S"
-	],
-	"gdb": "riscv64-unknown-elf-gdb"
-}