SMART Embedded Computing MVME2502, Installation And User Manual

Page: 85 / 150

Functional Description
MVME2502 Installation and Use (6806800R96L) 85
Crisis recovery is performed as follows:
1. Power off the board.
2. Set Switch S2-2 to ON to point to SPI Device B (crisis image).
3. Power on the board.
4. Press
<h>
key on the keyboard to go to the U-Boot prompt.
5. Type
moninit fru
to copy the crisis image to SPI Device A.
6. Once the U-Boot prompt is visible, power off the board.
7. Set the S2-2 back to OFF to point to the SPI Device A.
8. Power on the board to boot from the newly recovered image on the SPI Device A.
4.7 Front UART Control
The MVME2502 utilizes one of the two UART functions provided in the male micro-mini
DB-9 front panel. A male-to-male micro-mini DB-9 to DB9 adapter cable is available under
Penguin Edge Part Number SERIAL-MINI-D (30-W2400E01A) and is approximately 12
inches in length.
Only 115200bps and 9600bps are supported. The default baud rate on the front panel serial
is 9600kbps.
4.8 Rear UART Control
The MVME2502 utilizes the Exar ST16C554 quad UART (QUART) to provide four
asynchronous serial interface’ to the RTM. These devices feature 16 bytes of transmit and
receive first-in first-out (FIFO) with selectable receive FIFO trigger levels and data rates of
up to 1.5Mbps. Each UART has a set of registers that provide the user with operating status
and control. The QUART are 8-bit devices connected to the processor through the local bus
controller using LBC chipset CS1, CS2, CS3 and CS4.
These four serial interfaces are routed to P2 I/O for RTM accessibility. There are total of
five serial ports available on the MVME2502 board.
The board will automatically switch over if one of the devices is corrupted.