Konrad Beckmann kbeckmann

Notes about clocks in Caravel

2021-05-09 by kbeckmann

These are my notes of how I interpret how the clock tree works in Caravel. It might be inaccurate.

caravel:

	Program terminated with signal SIGSEGV, Segmentation fault.
	#0 0x0000561db819718a in std::vector<Yosys::hashlib::dict<Yosys::RTLIL::IdString, Yosys::RTLIL::Const, Yosys::hashlib::hash_ops<Yosys::RTLIL::IdString> >::entry_t, std::allocator<Yosys::hashlib::dict<Yosys::RTLIL::IdString, Yosys::RTLIL::Const, Yosys::hashlib::hash_ops<Yosys::RTLIL::IdString> >::entry_t> >::size (this=<optimized out>)
	at /usr/include/c++/10.2.0/bits/stl_vector.h:919
	919 { return size_type(this->_M_impl._M_finish - this->_M_impl._M_start); }
	(gdb) bt
	#0 0x0000561db819718a in std::vector<Yosys::hashlib::dict<Yosys::RTLIL::IdString, Yosys::RTLIL::Const, Yosys::hashlib::hash_ops<Yosys::RTLIL::IdString> >::entry_t, std::allocator<Yosys::hashlib::dict<Yosys::RTLIL::IdString, Yosys::RTLIL::Const, Yosys::hashlib::hash_ops<Yosys::RTLIL::IdString> >::entry_t> >::size (this=<optimized out>)
	at /usr/include/c++/10.2.0/bits/stl_vector.h:919
	#1 Yosys::hashlib::dict<Yosys::RTLIL::IdString, Yosys::RTLIL::Const, Yosys::hashlib::hash_

	from nmigen import *
	from nmigen._toolchain.yosys import *
	from nmigen.back.cxxrtl import rtlil

	import os, subprocess

	def _convert_rtlil_text(rtlil_text, black_boxes, verilog_boxes, *, src_loc_at=0):
	if black_boxes is not None:
	if not isinstance(black_boxes, dict):
	raise TypeError("CXXRTL black boxes must be a dictionary, not {!r}"

	from nmigen import *
	from enum import IntEnum

	from nmigen.utils import bits_for

	class AccessFlags(IntEnum):
	R = 1 << 0
	W = 1 << 1
	RW = R \| W

	from nmigen import *
	from nmigen.build import *

	from nmigen_boards.tang_nano import TangNanoPlatform

	class Blinky(Elaboratable):
	def elaborate(self, platform):
	m = Module()

	platform.add_resources([

	from nmigen import *
	from nmigen.build import *

	import itertools

	from nmigen_boards.tang_nano import TangNanoPlatform

	class Blinky(Elaboratable):
	def elaborate(self, platform):
	m = Module()

	import time
	import psutil
	import multiprocessing as mp
	from multiprocessing import Process

	def f(thread, duty, freq, q):
	p = psutil.Process()
	p.cpu_affinity([thread])

	while True:

	import sys
	import struct
	import binascii

	# See https://github.com/f4exb/sdrangel/tree/master/plugins/samplesource/filesource

	data = open(sys.argv[1], "rb").read()
	out = open(sys.argv[2], "wb")

	w = bytearray()

	/*
	$ AFL_USE_ASAN=1 afl-clang-fast fuzzer.c -o fuzzer
	$ afl-launch -i in_dir -o out_dir -m none -n $(nproc --all) -- ./fuzzer @@
	$ afl-whatsup -s out_dir
	*/

	#include <stdio.h>
	#include <stdlib.h>

	#define BUF_SIZE 1024*1024