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build/lattice: add bit_to_svf script from Project Trellis to allow using OpenOCD with Diamond.

This commit is contained in:
Florent Kermarrec 2020-11-28 08:58:04 +01:00
parent 785bc7e86c
commit 289234b102
1 changed files with 109 additions and 0 deletions
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109
litex/build/lattice/bit_to_svf.py Normal file
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#!/usr/bin/env python3
# Very basic bitstream to SVF converter
# This file is Copyright (c) 2018 David Shah <dave@ds0.me>
import sys
import textwrap
max_row_size = 100000
def bitreverse(x):
y = 0
for i in range(8):
if (x >> (7 - i)) & 1 == 1:
y |= (1 << i)
return y
def bit_to_svf(bit, svf):
with open(bit, 'rb') as bitf:
bs = bitf.read()
# Autodetect IDCODE from bitstream
idcode_cmd = bytes([0xE2, 0x00, 0x00, 0x00])
idcode = None
for i in range(len(bs) - 4):
if bs[i:i+4] == idcode_cmd:
idcode = bs[i+4] << 24
idcode |= bs[i+5] << 16
idcode |= bs[i+6] << 8
idcode |= bs[i+7]
break
if idcode is None:
print("Failed to find IDCODE in bitstream, check bitstream is valid")
sys.exit(1)
print("IDCODE in bitstream is 0x%08x" % idcode)
bitf.seek(0)
with open(svf, 'w') as svf:
print("""
HDR 0;
HIR 0;
TDR 0;
TIR 0;
ENDDR DRPAUSE;
ENDIR IRPAUSE;
STATE IDLE;
""", file=svf)
print("""
SIR 8 TDI (E0);
SDR 32 TDI (00000000)
TDO ({:08X})
MASK (FFFFFFFF);
""".format(idcode), file=svf)
print("""
SIR 8 TDI (1C);
SDR 510 TDI (3FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF);
SIR 8 TDI (C6);
SDR 8 TDI (00);
RUNTEST IDLE 2 TCK 1.00E-02 SEC;
SIR 8 TDI (3C);
SDR 32 TDI (00000000)
TDO (00000000)
MASK (0000B000);
SIR 8 TDI (46);
SDR 8 TDI (01);
RUNTEST IDLE 2 TCK 1.00E-02 SEC;
SIR 8 TDI (7A);
RUNTEST IDLE 2 TCK 1.00E-02 SEC;
""", file=svf)
while True:
chunk = bitf.read(max_row_size//8)
if not chunk:
break
# Convert chunk to bit-reversed hex
br_chunk = [bitreverse(x) for x in chunk]
hex_chunk = ["{:02X}".format(x) for x in reversed(br_chunk)]
print("\n".join(textwrap.wrap("SDR {} TDI ({});".format(8*len(chunk), "".join(hex_chunk)), 100)), file=svf)
print("""
SIR 8 TDI (FF);
RUNTEST IDLE 100 TCK 1.00E-02 SEC;
SIR 8 TDI (C0);
RUNTEST IDLE 2 TCK 1.00E-03 SEC;
SDR 32 TDI (00000000)
TDO (00000000)
MASK (FFFFFFFF);
! Shift in ISC DISABLE(0x26) instruction
SIR 8 TDI (26);
RUNTEST IDLE 2 TCK 2.00E-01 SEC;
! Shift in BYPASS(0xFF) instruction
SIR 8 TDI (FF);
RUNTEST IDLE 2 TCK 1.00E-03 SEC;
! Shift in LSC_READ_STATUS(0x3C) instruction
SIR 8 TDI (3C);
SDR 32 TDI (00000000)
TDO (00000100)
MASK (00002100);
""", file=svf)
if __name__ == "__main__":
bit_to_svf(sys.argv[1], sys.argv[2])