More resources

README.md

@@ -9,4 +9,9 @@
 
 ### Misc
 
+- [RISC-V From Scratch](https://github.com/twilco/riscv-from-scratch)
+  - [RISC-V from scratch 1: Introduction, toolchain setup, and hello world!](https://twilco.github.io/riscv-from-scratch/2019/03/10/riscv-from-scratch-1.html)
+  - [RISC-V from scratch 2: Hardware layouts, linker scripts, and C runtimes](https://twilco.github.io/riscv-from-scratch/2019/04/27/riscv-from-scratch-2.html)
+  - [RISC-V from scratch 3: Writing a UART driver in assembly](https://twilco.github.io/riscv-from-scratch/2019/07/08/riscv-from-scratch-3.html)
+  - [RISC-V from scratch 4: Creating a function prologue for our UART driver](https://twilco.github.io/riscv-from-scratch/2019/07/28/riscv-from-scratch-4.html)
 - [RISC-V Assembly Language Programming](https://github.com/rswinkle/riscv_book/)

end.s

@@ -16,4 +16,5 @@ end:
 
     addi a0, x0, 0x0A
     sb a0, (a1) # '\n'
-    ret
+    ret
+

main.s

@@ -66,4 +66,5 @@ hello2:
     ecall
 
 # To avoid the program from exiting
-loop: j loop
+loop: j loop
+

makefile

@@ -21,8 +21,8 @@ CFLAGS += -nostartfiles# 		# Do not use standard startup files
 CFLAGS += -nostdlib#			# Do not use standard libraries
 CFLAGS += -fno-builtin#			# Do not use built-in functions
 CFLAGS += -fno-common#			# Do not use common sections
-CFLAGS += -march=rv64i			# Use RV64I ISA, i.e., integer only
+CFLAGS += -march=rv64i#			# Use RV64I ISA, i.e., integer only
-CFLAGS += -mabi=lp64			# Use LP64 ABI, i.e., 64-bit longs and pointers, 32-bit ints
+CFLAGS += -mabi=lp64#			# Use LP64 ABI, i.e., 64-bit longs and pointers, 32-bit ints
 CFLAGS += -Os#					# Optimize for size
 
 LDFLAGS += -T link.ld			# Use the linker script