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picorv32
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Removed multiplier/divider

This commit is contained in:
Guy Hutchison 2018-10-18 20:33:40 +00:00
parent f47ac81c89
commit 73318eaeab
5 changed files with 75 additions and 6 deletions
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11
scripts/romload/.gitignore vendored Normal file
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@ -0,0 +1,11 @@
firmware.d
firmware.elf
firmware.hex
firmware32.hex
firmware.o
firmware_addr.txt
firmware_dbg.v
syscalls.o
testbench.vvp
testbench.vcd
start.elf

53
scripts/romload/Makefile Normal file
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@ -0,0 +1,53 @@
ifndef RISCV_TOOLS_PREFIX
RISCV_TOOLS_PREFIX = /opt/riscv32ic/bin/riscv32-unknown-elf-
endif
CXX = $(RISCV_TOOLS_PREFIX)g++ -march=rv32i
CC = $(RISCV_TOOLS_PREFIX)gcc -march=rv32i
AS = $(RISCV_TOOLS_PREFIX)gcc -march=rv32i
CXXFLAGS = -MD -Os -Wall -std=c++11
CCFLAGS = -MD -Os -Wall
#LDFLAGS = -Wl,--gc-sections,--no-relax
LDFLAGS = -Wl,--gc-sections
LDLIBS =
test: testbench.vvp firmware32.hex
vvp -l testbench.log -N testbench.vvp
testbench.vvp: testbench.v ../../picorv32.v firmware_dbg.v
iverilog -D WRITE_VCD=1 -o testbench.vvp testbench.v ../../picorv32.v
chmod -x testbench.vvp
firmware32.hex: firmware.elf hex8tohex32.py
$(RISCV_TOOLS_PREFIX)objcopy -O verilog firmware.elf firmware.tmp
python3 hex8tohex32.py firmware.tmp > firmware32.hex
#firmware32.hex: firmware.elf start.elf hex8tohex32.py
# $(RISCV_TOOLS_PREFIX)objcopy -O verilog start.elf start.tmp
# $(RISCV_TOOLS_PREFIX)objcopy -O verilog firmware.elf firmware.tmp
# cat start.tmp firmware.tmp > firmware.hex
# python3 hex8tohex32.py firmware.hex > firmware32.hex
# rm -f start.tmp firmware.tmp
firmware_dbg.v: firmware.map
python3 map2debug.py
#firmware.o: firmware.c
# $(CC) -c $^
start.o: start.S
$(CC) -c -nostdlib start.S $(LDLIBS)
firmware.elf: firmware.o syscalls.o start.o
$(CC) $(LDFLAGS),-Map=firmware.map -o $@ $^ -T sections.lds $(LDLIBS)
chmod -x firmware.elf
start.elf: start.S start.ld
$(CC) -nostdlib -o start.elf start.S -T start.ld $(LDLIBS)
chmod -x start.elf
clean:
rm -f *.o *.d *.tmp start.elf
rm -f firmware.elf firmware.hex firmware32.hex
rm -f testbench.vvp testbench.vcd
-include *.d
.PHONY: test clean

2
scripts/romload/sections.lds
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@ -33,7 +33,7 @@ SECTIONS {
*(.sdata .sdata.*)
. = ALIGN(4);
_edata = .;
/* } >ram AT>rom */
} >ram AT>rom
/* } >ram */
.bss : {

1
scripts/romload/start.S
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@ -79,7 +79,6 @@ sw zero,12(sp)
2:
*/
/* jump to libc init */
/*j _ftext
*/

14
scripts/romload/testbench.v
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@ -3,7 +3,7 @@
//`undef WRITE_VCD
`undef MEM8BIT
`define ROM_SIZE 32'h0000_0000
`define ROM_SIZE 32'h0001_00FF
//`define ROM_SIZE 32'h0000_0000
module testbench;
@ -30,9 +30,7 @@ module testbench;
picorv32 #(
.COMPRESSED_ISA(1),
.PROGADDR_RESET(32'h100),
.ENABLE_MUL(1),
.ENABLE_DIV(1)
.PROGADDR_RESET(32'h100)
) uut (
.clk (clk ),
.resetn (resetn ),
@ -54,11 +52,19 @@ module testbench;
end
`else
reg [31:0] memory [0:MEM_SIZE/4-1];
`define data_lma 32'hc430
`define data 32'h20000
`define edata 32'h209b0
integer x;
initial
begin
// clear memory
for (x=0; x<MEM_SIZE/4; x=x+1) memory[x] = 0;
// load rom contents
$readmemh("firmware32.hex", memory);
// copy .data section
for (x=0; x<(`edata - `data); x=x+4)
memory[(`data+x)/4] = memory[(`data_lma+x)/4];
end
`endif