>>>>> "Adam" == Adam Megacz <[email protected]> writes:
Adam> Hey guys, thanks for writing such a great everything-in-one-place
Adam> jtag tool!
Adam> I'm happy to report that I was able to program a Xilinx Virtex-5
Adam> XUP board (aka "ML509" -- the ML505 with the bigger chip) using
Adam> the xpc_ext driver from urjtag, a Xilinx Platform Cable (USB), and
Adam> an SVF file generated by Xilinx's IMPACT tool! Even better, I was
Adam> able to talk to the BSCAN_VIRTEX5 block on the chip using urjtag!
Adam> The bad news -- aside from the fact that xpc_ext is pretty slow --
Adam> is the fact that the SVF parser has serious problems coping with
Adam> large SVF files. The lexer is designed to lex the bitstring of an
Adam> "SDR" command as one gigantic token (in my case, a 31MB token),
Adam> but unfortunately flex's performance is O(n+m^2) where m is the
Adam> length of the longest token in the file -- it's not meant for
Adam> large tokens. So, while the programming was successful, it took
Adam> over an hour *just to read in the SVF file*.
Sorry for advertising another project. For pure JTAG
programming/readback/verify of Xilinx-CPLD/Spartan FPGA/Configurating (SPI)
Flash and JTAG-enable AVR with Adapters like DLC10, FT2232L|H, parallel Port
from BIT/MCS/SREC files etc. on linux/BSS/win32, look at my recent work on
xc3sprog at sourceforge. All devices with published 1532 BSDL can probaby be
made to work. But as I don't have a V5 device to test, I didn't tackle
yet. Any volunteers?
Adam> Does anybody see an easy fix? The only solution I can see is to
Adam> change the grammar so that each character of a bitstring is a
Adam> lexene and the parser gangs them together (bison can handle long
Adam> sequences of lexenes with linear performance if you write the
Adam> grammar properly). But this is a pretty hard thing to do unless
Adam> one is very familiar with the particular svf_bison.y that urjtag
Adam> uses.
So my proposal: drop SVF. So either use xc3sprog for that task or reuse the
implementations in xc3sprog
...
Adam> PS, are there any USB cables that can sustain 12mbit/sec using
Adam> urjtag? If not, which cable is the fastest when using the latest
Adam> SVN version of urjtag?
DLC10 and FT2232H for sure have the power. I don't know what status the
xpc_ext driver in urjtag has, but kawk reverse engineered most of the DLC10
protocoll and with that information the xc3sprog xpc-ext driver can deliver
more throughput
Adam> PPS, has anybody else noticed that the number of .bdsl files in
Adam> the "bdsl path" greatly degrades the amount of time required for
Adam> "detect"? This is sort of a bummer, because it means we can't
Adam> just dump the entire collection of bdsl's from Xilinx's kit into
Adam> urjtag's directory -- we have to carefully select just the minimum
Adam> number to get the job done.
While the urjtag approach to detect the chain is more general, the
devlist.txt approach in xc3sprog in much slicker. Recent xc3sprog has a
default devlist.txt compiled in as fallback, so for standard situations you
only need the executable.
Bye
--
Uwe Bonnes [email protected]
Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
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