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cpu/picorv32: Create minimal variant (disable mul/div insns, most speed optimizations).

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This commit is contained in:
William D. Jones 2018-10-29 01:41:02 -04:00
parent d05fe673a0
commit f69bd877b9
1 changed files with 18 additions and 2 deletions
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20
litex/soc/cores/cpu/picorv32/core.py
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@ -9,10 +9,12 @@ class PicoRV32(Module):
name = "picorv32" name = "picorv32"
endianness = "little" endianness = "little"
gcc_triple = ("riscv64-unknown-elf", "riscv32-unknown-elf") gcc_triple = ("riscv64-unknown-elf", "riscv32-unknown-elf")
gcc_flags = "-D__picorv32__ -mno-save-restore -march=rv32im -mabi=ilp32" gcc_flags_template = "-D__picorv32__ -mno-save-restore -march=rv32{ext} -mabi=ilp32"
linker_output_format = "elf32-littleriscv" linker_output_format = "elf32-littleriscv"
def __init__(self, platform, progaddr_reset, variant): def __init__(self, platform, progaddr_reset, variant):
self.gcc_flags = ""
self.reset = Signal() self.reset = Signal()
self.ibus = i = wishbone.Interface() self.ibus = i = wishbone.Interface()
self.dbus = d = wishbone.Interface() self.dbus = d = wishbone.Interface()
@ -59,8 +61,22 @@ class PicoRV32(Module):
"p_STACKADDR" : 0xffffffff "p_STACKADDR" : 0xffffffff
} }
if variant == None:
self.gcc_flags = PicoRV32.gcc_flags_template.format(ext="im")
elif variant == "minimal":
picorv32_params.update({
"p_ENABLE_COUNTERS" : 0,
"p_ENABLE_COUNTERS64" : 0,
"p_TWO_STAGE_SHIFT" : 0,
"p_CATCH_MISALIGN" : 0,
"p_ENABLE_MUL" : 0,
"p_ENABLE_DIV" : 0,
"p_ENABLE_IRQ_TIMER" : 0
})
self.gcc_flags = PicoRV32.gcc_flags_template.format(ext="i")
self.specials += Instance("picorv32", self.specials += Instance("picorv32",
# parameters # parameters dictionary
**picorv32_params, **picorv32_params,
# clock / reset # clock / reset