PC BIOS/PCI/motherboard access to JTAG signals ??

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#894

From: M.Vasilko
Date: Fri, 10 Jul 1998 00:00

32 lines
1974 bytes

Hi

I am trying to find some information on how can one access
the IEEE1149.1 JTAG boundary test scan signals on a PC motherboard.
After a day of surfing various motherboard, PC BIOS and chipset
pages I don't seem to be able to find any relevant details.

I want to find out whether:
- one can talk to the motherboard's JTAG controller via e.g. BIOS
or I/O registers
- one can access the JTAG daisy-chain after the BIOS has booted
up the motherboard

I would also appreciate any examples of commonly used JTAG controllers
on 486/Pentium motherboard and how these connect the JTAG interface to
the PCI bus.

I want to explore whether it would be possible to configure an FPGA (Field
Programmable Gate Array)  acting as a target PCI interface
via the JTAG pins (available on both the PCI bus and the FPGA).
Has anyone tried this ?


Thanks for any pointers.


Milan Vasilko
--
Please CC to: M.Vasilko@computer.org

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From: M.Vasilko@computer.org
Subject: PC BIOS/PCI/motherboard access to JTAG signals ??
Date: 1998/07/10
Message-ID: <6o5c2g$chd$1@nnrp1.dejanews.com>
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