Stepping in boot code of DB800 via JTAG

[llandre]

I successfully booted the DB800 evaluation board with coreboot v2, 
however I can't step the boot code via JTAG (FS2 System Navigator).
Following is the console dump.
Anybody experienced the same problem?

=======================================================================
System Analyzer for Geode(tm) GX/LX Processor
Serial number 40464
Software version 2.1.3 build 3
Hardware version sysnav
Copyright (C) 1998-2005 First Silicon Solutions, Inc.
The initialization file, user.tcl, has completed successfully.
1> reset
User reset.
cs:0xFFF0u  E9F176       jmp 0x76e4
2> config
{BkptPoll 100}
{BtmHack off}
{ChipType auto}
{Coherent auto}
{DisablePowerManagement off}
{DisableTrace off}
{EipHack off}
{Flash SST49LF004B-block}
{GdbPort 54545}
{JtagChain 24,X}
{Path C:/PROGRA~1/Fs2/Geode/Bin}
{Port sysnav-usb}
{ReserveDR off}
{ResetDuration 500}
{RestoreAllRegs off}
{ShowFtw off}
{TckRate 700000}
{TraceFlushEip 0xfffffff3}
{TrigInActiveState 0}
{TrigOutActiveState 0}
{TrigOutTarget off}
{TvccThreshold 1500}
{UserDR off}
3> step
CPU does not respond to stop requests.  CPU could be hung.
=======================================================================

TIA,
llandre

DAVE Electronics System House - R&D Department
web:   http://www.dave.eu
email: r&[e-mail]

[Marc Jones]

llandre wrote:
> I successfully booted the DB800 evaluation board with coreboot v2, 
> however I can't step the boot code via JTAG (FS2 System Navigator).
> Following is the console dump.
> Anybody experienced the same problem?

llandre,

I think you need to halt before you step. On a reset the CPU runs unless 
you put it into debug stall via the bootstrap options. See 
GLCP_SYS_RSTPLL 4C000014h.

Marc

[llandre]

The technical support from mips.com helped me to solve the problem. It 
is necessary to issue the following command first:

config disabletrace on

Regards,
llandre

DAVE Electronics System House - R&D Department
web:   http://www.dave.eu
email: r&[e-mail]
> llandre wrote:
> > I successfully booted the DB800 evaluation board with coreboot v2, 
> > however I can't step the boot code via JTAG (FS2 System Navigator).
> > Following is the console dump.
> > Anybody experienced the same problem?
>
> llandre,
>
> I think you need to halt before you step. On a reset the CPU runs unless 
> you put it into debug stall via the bootstrap options. See 
> GLCP_SYS_RSTPLL 4C000014h.
>
> Marc