Re: [ts-7000] Re: ts7200 won't boot into redboot... I erased flash and killed it....

[zeener zits <>]

I will try grounding U19 pin 58 and retry the serial blaster.
 If it does not work then I will insert a momentary switch (no) into the circuit to provide the additional reset you are referring to. (after further investigation onto proper placement in the circuit).
 

uhmgawa <> wrote:
>     Curtis Monroe wrote:
>  > I tried to serial boot my TS-7200 today. Its watchdog is set for 1 second. So 
>  > it's impossible to serial boot it without hardware modifications, (or a CPLD 
>  > reprogram).
>  
>  This is really interesting.  I can't imagine why such a short
>  duration WDT reset would be configured.  2Hz exits the CD4020
>  which is being further divided by u19 which is generating the
>  9302 reset.  So it is possible a shorter divider chain was
>  configured.
>  
>  If
>  u21 is obscured by the particular CF connector on your
>  board (note it isn't on the board sitting in front of me
>  nor AFAICT on the board pic displayed on TS's site), you
>  can follow the connection from u19.58 which is the 2Hz input
>  to the CPLD.  The trace runs partly on the bottom layer
>  and easily accessible.  I'd probably try temporarily
>  grounding a trace via to attempt disabling the associated
>  watch dog.
>  
>  > The EP9301 on my board downloads the serial boot program at 9600bps. It can 
>  > only load 960 Bytes in one second. Not even half of the 2048 Bytes needed to 
>  > load the SerialBlaster Boot loader.
>  
>  The other possibility is you are hitting the 93xx internal
>  WDT timeout causing a reset.  This must be disabled by
>  pulling -CS1 low during reset according to the manual,  It
>  also ventures to u19.58 which may be doing so.
>  
>  However the internal WDT kicked reset looks to be more on
>  the
>  order of 0.5s (256ms WDT timeout + 256ms reset pulse duration).
>  Another Cirrus marvel.
>  
>  -- 
>  
>

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