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Replace bios with bootloader, don't use bootsector

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Instead of using the bootsector to load a bootloader, just put the
bootloader in the ROM and call it a day. It looks for a file on the SD
card in the root directory named `kernel.bin` and loads it into memory.

This is not a perfect solution, as the kernel will grow larger and the
kernel load address will have to change. At this point I could add back
the bootloader, but that is for later.

Also the bootloader is just a copy of the kernel, so that can be trimmed
down a lot.
This commit is contained in:
Byron Lathi
2022-04-19 10:34:19 -05:00
parent f664d59497
commit f3c7ac9696
42 changed files with 1295 additions and 232 deletions
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15
sw/bootloader/Makefile
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@@ -7,18 +7,31 @@ SIMARGS=-v -c -x 1000000
NAME=bootloader
TEST_BIN=test.bin
BIN=$(NAME).bin
HEX=$(NAME).hex
LISTS=lists
TESTS=tests
SRCS=$(wildcard *.s) $(wildcard *.c)
SRCS+=$(filter-out $(wildcard tests/*), $(wildcard **/*.s)) $(filter-out $(wildcard tests/*), $(wildcard **/*.c))
OBJS+=$(patsubst %.s,%.o,$(filter %s,$(SRCS)))
OBJS+=$(patsubst %.c,%.o,$(filter %c,$(SRCS)))
TEST_SRCS=$(wildcard $(TESTS)/*.s) $(wildcard $(TESTS)/*.c)
TEST_OBJS+=$(patsubst %.s,%.o,$(filter %s,$(TEST_SRCS)))
TEST_OBJS+=$(patsubst %.c,%.o,$(filter %c,$(TEST_SRCS)))
TEST_OBJS+=$(filter-out boot.o,$(filter-out main.o,$(filter-out vectors.o,$(OBJS))))
all: $(HEX)
test: $(TEST_BIN)
$(SIM) $(SIMARGS) $(TEST_BIN)
$(TEST_BIN): $(OBJS) $(TEST_OBJS)
$(CC) $(CFLAGS) $(TEST_OBJS) -o $@
$(HEX): $(BIN)
objcopy --input-target=binary --output-target=ihex $(BIN) $(HEX)
@@ -34,8 +47,10 @@ $(BIN): $(OBJS)
$(LISTS):
mkdir -p $(addprefix $(LISTS)/,$(sort $(dir $(SRCS))))
mkdir $(LISTS)/$(sort $(dir $(TEST_SRCS)))
.PHONY: clean
clean:
rm -rf $(OBJS) $(BIN) $(HEX) $(LISTS) $(NAME).map
rm -rf $(TEST_OBJS) $(TEST_BIN)