On 08/15/2005 01:59 PM, Ken Fuchs wrote:
The xeltek ISP Header + 280U can be used for in-system programming.
That could be useful, if your mb don't have flash socket and flash os soldered in.
That's great; I just added it to the FAQ. The hardware development tools links currently in the FAQ might be better off right on the main page. Anyone seriously interested in helping linuxbios is going to need some of those tools.
This would require one or more (a lot of them for the Xeltek ISP Header) headers on the mainboard. I couldn't find any information about the Xeltek ISP Header. It seems like it might even work on an Enhanced Willem Universal Programmer. It would be simpler to have a single larger header, if the Xeltec ISP Header (adapter) needs to be detached while the mainboard is operating. I'd really prefer something that can remain attached while the mainboard is in operation.
Ya, there are such things floating around. I've seen in circuit programmers before; this xeltek one looks like it may be hard to use.
It would even be possible to use the JTAG connector to flash the system BIOS. All Opteron mainboards must include "JTAG" circuits, but
You don't say!
usually don't include the two JTAG headers. Adding the headers is quite easy.
Hmmm. two headers? Interesting.
An open source Opteron JTAG flash programmer is probably won't happen any time soon,
Holy (**& that's fantastic. It sure might happen soon! OK, I might be getting ahead of myself. Are you sure the Opteron doesn't require a ITP or similar debugging port? Or in other words: Can you single step/halt the processor/dump registers using the JTAG port. Lets hope so; otherwise you might not be able to do much via the JTAG port.
JTAG is a fantastic standard -- I'd expect it to be adopted for any new chip entering the market.
although it shouldn't be too difficult to do. Anyone aware of an open source JTAG flash programmer of any kind?
Yes, there are at least two projects. I added a JTAG programming page to the FAQ: http://linuxbios.org/index.php/JTAG/BSDL_Guide
So here are some questions then:
Do you know of any motherboards that leave the JTAG connections populated?
Do you have instructions for populating them on some motherboard I could pick up?
Do you have links to the Opteron JTAG docs (these docs will tell you what you can and can't do from the JTAG port)?
We will need the BSDL files for the Opteron. Now if only that was the case for the Pentium M...
Have a nice day, Jeff
Here is output of talking to a Xilinx FPGA & CPLD using a $25 jtag cable from linux with all free software: (that's why everyone is switching to JTAG -- cheaper manufacturing software/hardware costs)
jtag> cable parallel 0x378 DLC5 Initializing Xilinx DLC5 JTAG Parallel Cable III on parallel port at 0x378 jtag> detect IR length: 14 Chain length: 2 Device Id: 00000101000001000110000010010011 Manufacturer: Xilinx Unknown part! Device Id: 00010001010000101000000010010011 Manufacturer: Xilinx Part: xc3s1000_ft256 Stepping: 0 Filename: /usr/share/jtag/xilinx/xc3s1000_ft256/xc3s1000_ft256 chain.c(110) Part 0 without active instruction chain.c(133) Part 0 without active instruction chain.c(110) Part 0 without active instruction jtag> instruction SAMPLE/PRELOAD jtag> shift ir chain.c(110) Part 0 without active instruction jtag>