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#-------------------------------------------------------------------------------

# This makefile does not contain any targets, only definitions used by the

# makefiles of all the code samples.

# It is meant to be included and not used standalone.

#-------------------------------------------------------------------------------

# SYSTEM PARAMETERS

#

# You can define here the size and address of the memory blocks of the system,

# though you can't change the number and type of blocks here (see

# /vhdl/mips_cache_*.vhdl).

# Addresses are duplicated in the linker script (ion*.lds).

#

#-------------------------------------------------------------------------------

# KNOWN PROBLEMS AND WORKAROUNDS

#

# 1.- LINK PROBLEM IF FLAG '-G0' NOT USED

#       If flag '-G0' is not used on gcc, linker fails with 'relocation

#       truncated to fit: R_MIPS_GPREL16' error message.

#       This only happens when you use global or static veriables, initialized

#       or not.

#       (See explaination in the project docs about $gp indexed addressing in

#       MIPS architectures and the -G0 flag).

#

#     SUSPECTED CAUSE:

#       I'm sure there is something wrong with my linker script.

#       With the default link scripts this does not happen. Yet we need to use

#       a script so that we can split code and data (including read-only) to

#       different sections (and later to different ram blocks).

#

#     WORKAROUND:

#       Use -G0 flag so that _gp indexing is disabled. There is a performance

#       hit, though. In effect we're telling the compiler to NOT use $gp for

#       indexed access to any global variables.

#       This is only necessary for the 'bare' target (no external ram and no

#       cache) and will have to be fixed for regular targets (by using a

#       standard link script or fixing mine).

#-------------------------------------------------------------------------------

### Toolchain config ###########################################################

ifeq ($(LANG),)

#****  Customize for Windows/Cygwin

# Some common file commands (Cygwin/sh version, use your own)

CP = cp

RM = RM

DWIN32 = -DWIN32

LINUX_PWD =

# MIPS GCC cross-toolchain: CodeSourcery -- replace with your own

BIN_MIPS = C:/desarrollo/SourceryGpp/bin

GCC_MIPS  = $(BIN_MIPS)/mips-sde-elf-gcc.exe $(CFLAGS)

AS_MIPS   = $(BIN_MIPS)/mips-sde-elf-as

LD_MIPS   = $(BIN_MIPS)/mips-sde-elf-ld

DUMP_MIPS = $(BIN_MIPS)/mips-sde-elf-objdump

COPY_MIPS = $(BIN_MIPS)/mips-sde-elf-objcopy

TO_VHDL   = python ../bin2hdl.py

else

#**** Customize for Linux

# MIPS GCC cross-toolchain: BuildRoot toolchain in my home directory -- replace with your own

# NOTE: we will not use gcc builtin functions or libc

BIN_MIPS = /home/jaruiz/desarrollo/uClinux/MIPS/buildroot/buildroot-2010.11/output/staging/usr/bin

GCC_MIPS = $(BIN_MIPS)/mips-unknown-linux-uclibc-gcc $(CFLAGS)

AS_MIPS = $(BIN_MIPS)/mips-unknown-linux-uclibc-as

LD_MIPS = $(BIN_MIPS)/mips-unknown-linux-uclibc-ld

DUMP_MIPS = $(BIN_MIPS)/mips-unknown-linux-uclibc-objdump

COPY_MIPS = $(BIN_MIPS)/mips-unknown-linux-uclibc-objcopy

TO_VHDL = python ../bin2hdl.py

endif

### System parameters ##########################################################

# FIXME clean up parameter names

# 'CODE_BRAM' is meant to be a small BRAM (2 to 4KB) used for bootstrapping.

# 'DATA_BRAM' is a small BRAM connected to the data ports, used for debugging.

# 'XRAM' is meant to be the main external RAM, either SRAM or SDRAM.

# Default location of code BRAM is on the reset vector address

CODE_BRAM_ADDRESS = 0

# Default size of code BRAM in 32-bit words

CODE_BRAM_SIZE = 1024

# Default size of data BRAM in 32-bit words

DATA_BRAM_SIZE = 256

# Default address of BRAM -- used in some simulation-only tests, see makefiles

DATA_BRAM_ADDRESS = 0x10000

# Default size of data external RAM (XRAM) in 32-bit words (for simulation)

XRAM_SIZE = 2048

# Default address of XRAM

XRAM_ADDRESS = 0x80000000

### Build options ##############################################################

# Don't use gcc builtin functions, and try to target MIPS-I architecture

# This will prevent usage of unimplemented opcodes but will insert nops after

# load instructions, which Ion does not need.

# (See comment above about -G0 flag)

CFLAGS = -O2 -Wall -c -s -fno-builtin -mips1 -G0

# For most simulations and demos we'll use these parameters

# Set code to BRAM and use XRAM for data

# This will only work for small programs that fit the BRAM

LFLAGS_BOOT = -Ttext $(CODE_BRAM_ADDRESS) -Tdata $(XRAM_ADDRESS) -eentry -I elf32-big

# For some simulations we'll want to use TB1 which requires splitting code and

# data. Use project 'bare cpu' linker script and build elf-bigendian objects.

LFLAGS_BARE = -T../ion_noxram.lds -I elf32-big -eentry

### Project directories ########################################################

# VHDL test bench directory, where VHDL output files will be created

TB_DIR = ../../vhdl/tb

# VHDL DE-1 board demo root directory, for vhdl output

DEMO_DIR = ../../vhdl/demo

# Root test code source directory, where python script and vhdl templates are

SRC_DIR = ..