| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 1811.1 | console recovery procedure | LEDDEV::DHATI | | Thu Jan 23 1997 12:04 | 8 |
| 1811.2 | nogo | YAKKA::KINGSMILL | Geoff Kingsmill, Australia | Thu Jan 23 1997 23:41 | 9 |
|
Thanks for the pointer. I followed the instructions but unfortunately this made
no difference. After applying power I didn't see the flopppy access light flash
so it doesn't look like the system is getting this far in the power up
sequence. This doesn't sound like a hardware failure. What does the mini-console
jumper do? What else can we do to isolate this problem?
Thanks,
Geoff..
|
| 1811.3 | failsafe loader mode | LEDDEV::DHATI | | Fri Jan 24 1997 11:58 | 21 |
| Jumper j13 is the failsafe loader mode not mini console mode.
Make sure you have the jumper in the right place. It is the
3rd jumper starting from the front end.
The way the powerup sequence works is the SROM does the initial
powerup and then transfers control to the fw to complete the rest
of the powerup.
If the failsafe loader does not work , it means that either the
srom countdown has failed or the hardware is really broken.
My guess would be the hardware could be broken. If you are determined
to isolate the problem, you can try debugging with the srom countdown.
To see the srom sequence , you need a serial adapter that will fit into
the srom port which is located next to the J11-J19 cluster. This port
runs at 19200 baud. So set the terminal speed accordingly.
On powerup , you will see the sequence being displayed thru this port.
- Sridhar.
|
| 1811.4 | getting there bit by bit | YAKKA::KINGSMILL | Geoff Kingsmill, Australia | Fri Jan 24 1997 20:04 | 18 |
| < Jumper j13 is the failsafe loader mode not mini console mode.
< Make sure you have the jumper in the right place. It is the
< 3rd jumper starting from the front end.
Yes I was using failsafe loader mode with j13 installed.
< To see the srom sequence , you need a serial adapter that will fit into
< the srom port which is located next to the J11-J19 cluster. This port
< runs at 19200 baud. So set the terminal speed accordingly.
< On powerup , you will see the sequence being displayed thru this port.
I do not have the serial adapter cable. I think I've found the right pin
using an oscilloscope but when I connect a terminal at 19200 (8bit) it looks
like I've got a baud rate problem. The output restarts when I press the reset
button. Can you give me the pintouts with a reference to pin 1?
Thanks,
Geoff..
|
| 1811.5 | SROM 'dongle' part number and pinouts | WRKSYS::HOUSE | Kenny House, Workstations Engineering | Sat Jan 25 1997 07:47 | 20 |
| Here are some extracts from the Miata spec, I thing the SROM interface
hardware is the same.
-- Kenny House
An SROM "dongle" (part number 96-RM001-01) can be used to interface an
external serial line with the CPU's SROM interface.
...
Table D-6: Serial Diagnostic Port Connector Pinout
signal pin pin description looking at MLB
- 1 6 BSROMOE_L -----
ground 2 7 SROMOVRD +--' `--+
+12V 3 8 Vdd 10| o o o o o |6
ground 4 9 BSROMCLK 5| o o o o o |1
ground 5 10 SROMCDAT +-----------+
|
| 1811.6 | I think you need a dongle | WRKSYS::SCHUMANN | | Sat Jan 25 1997 17:06 | 4 |
| I think the signals levels at the dongle are inverted from your normal
serial port. They are also ttl levels, not RS-232. The dongle has
the inverting RS-232 transceiver on it.
|
| 1811.7 | dongle on order | YAKKA::KINGSMILL | Geoff Kingsmill, Australia | Mon Jan 27 1997 17:54 | 5 |
| Thanks,
I'll order the dongle cable and go from there.,
Geoff..
|