Add workarounds for working hardware RPI4

For now we need to disable compiler optimizations, since they seem to
mess up the mempoke16 memory access.

1 files changed, 4 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index 96c1b74..1fced4f 100644
--- a/Makefile
+++ b/Makefile
@@ -2,6 +2,8 @@
 .SUFFIXES:
 .PHONY: clean run
 
+RPI_VERSION ?= 3
+
 # Compiler.
 AS      := aarch64-elf-as
 CC      := aarch64-elf-gcc
@@ -21,7 +23,8 @@ OBJ_START = $(BUILD_DIR)/start.o
 OBJ_MAIN = $(BUILD_DIR)/main.o
 SRC_LINK = $(SRC_DIR)/linker.ld
 
-CFLAGS := -Wall -ffreestanding -O2 -nostdlib -lgcc -mgeneral-regs-only -fstack-protector
+CFLAGS := -Wall -ffreestanding -O1 -nostdlib -lgcc -mgeneral-regs-only -fstack-protector
+CFLAGS += -DRPI_VERSION=$(RPI_VERSION)
 AFLAGS :=
 LDFLAGS :=