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# makefiles of all the code samples.
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# makefiles of all the code samples.
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# It is meant to be included and not used standalone.
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# It is meant to be included and not used standalone.
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#-------------------------------------------------------------------------------
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#-------------------------------------------------------------------------------
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# SYSTEM PARAMETERS
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# SYSTEM PARAMETERS
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#
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#
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# You can define here the size and address of the memory blocks of the system,
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# You can define here the default size and address of the memory blocks of the
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# though you can't change the number and type of blocks here (see
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# system as seen by the linker, though you can't change the number and type of
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# /vhdl/mips_cache_*.vhdl).
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# blocks here (see /vhdl/mips_cache_*.vhdl and /vhdl/mips_pkg.vhdl).
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# Addresses are duplicated in the linker script (ion*.lds).
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#
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#
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#-------------------------------------------------------------------------------
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# The samples' makefiles will probably redefine the values, anyway.
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# KNOWN PROBLEMS AND WORKAROUNDS
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#
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# 1.- LINK PROBLEM IF FLAG '-G0' NOT USED
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# If flag '-G0' is not used on gcc, linker fails with 'relocation
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# truncated to fit: R_MIPS_GPREL16' error message.
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# This only happens when you use global or static veriables, initialized
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# or not.
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# (See explaination in the project docs about $gp indexed addressing in
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# MIPS architectures and the -G0 flag).
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#
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#
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# SUSPECTED CAUSE:
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#-------------------------------------------------------------------------------
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# I'm sure there is something wrong with my linker script.
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# NOTE:
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# With the default link scripts this does not happen. Yet we need to use
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# A link script '/src/ion_noxram.lds' was used in previous versions of the
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# a script so that we can split code and data (including read-only) to
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# project. It is no longer used. It is known to be buggy and will be removed.
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# different sections (and later to different ram blocks).
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#
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# WORKAROUND:
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# Use -G0 flag so that _gp indexing is disabled. There is a performance
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# hit, though. In effect we're telling the compiler to NOT use $gp for
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# indexed access to any global variables.
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# This is only necessary for the 'bare' target (no external ram and no
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# cache) and will have to be fixed for regular targets (by using a
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# standard link script or fixing mine).
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#-------------------------------------------------------------------------------
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#-------------------------------------------------------------------------------
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### Toolchain config ###########################################################
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### Toolchain config ###########################################################
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# This will prevent usage of unimplemented opcodes but will insert nops after
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# This will prevent usage of unimplemented opcodes but will insert nops after
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# load instructions, which Ion does not need.
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# load instructions, which Ion does not need.
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# (See comment above about -G0 flag)
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# (See comment above about -G0 flag)
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CFLAGS = -O2 -Wall -c -s -fno-builtin -mips1 -G0
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CFLAGS = -O2 -Wall -c -s -fno-builtin -mips1 -G0
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# For most simulations and demos we'll use these parameters
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# LFLAGS: linker options are in the respective makefiles
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# Set code to BRAM and use XRAM for data
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# This will only work for small programs that fit the BRAM
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LFLAGS_BOOT = -Ttext $(CODE_BRAM_ADDRESS) -Tdata $(XRAM_ADDRESS) -eentry -I elf32-big
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# For some simulations we'll want to use TB1 which requires splitting code and
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# data. Use project 'bare cpu' linker script and build elf-bigendian objects.
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LFLAGS_BARE = -T../ion_noxram.lds -I elf32-big -eentry
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### Project directories ########################################################
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### Project directories ########################################################
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# VHDL test bench directory, where VHDL output files will be created
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# VHDL test bench directory, where VHDL output files will be created
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TB_DIR = ../../vhdl/tb
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TB_DIR = ../../vhdl/tb
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