I could try to pull high the reset pin (pin 11) on the 74HC4020. This
would manually feed the watchdog, but I guess the CPLD FEED_WDOG pin
(pin 50) is in an output low state, so it would short. Hmmmm?
If I pulsed it quick enough I might be able to do it without frying the
CPLD.
Anyway, seems to dangerous.
I'd like to try to send the binary TS-PREBOOT code over serial. Please
send me a copy (Jesse).
Could you also let me know which register controls the EE_CS# line, so I
can re-burn the TS-PREBOOT to the EEPROM if I succeed in serial booting.
I'll open source my TS-SERIAL_RECOVERY if I succeed (won't include the
TS-PREBOOT image, people will need to get that from TS)
-Curtis.
On Fri, 2005-05-27 at 12:25, Jesse Off wrote:
> > I have a few questions:
> >
> > 1) can the "blaster" recover from an error in the EEPROM, or does
> it
> > just recover from errors in FLASH (redboot missing/corrupt)
>
> The CPLD on the TS7250 does the right thing and bypasses the SPI
> EEPROM when the blaster board is present. We use the blaster-board
> on our production floor to bring up every single TS-7250 board.
>
> >
> > 2) has TS open sourced the EEPROM code? if so, where can I find it?
>
> Not the code, but I can give you the binary. Its 2Kb of ARM Thumb
> code we call TS-PREBOOT. Its purpose is to boot the processor,
> initialize and self-test SDRAM, then load 16KB from NAND flash and
> jump into it.
>
> >
> > 3) is it technically possible to boot from serial (JP1 set), fast
> enough
> > that I can turn the watchdog off before it resets? I think it
> should be
> > as I only need to load 2048 bytes at 9600 baud.
>
> I don't think so. If your TS-BOOTROM reports a Rev B. PLD, we
> changed things so the watchdog is instead armed at 8 seconds on
> bootup which should be enough time to serial &
> feed/disable the watchdog.
>
> //Jesse Off
>
>
>
>
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