Artesyn MVME2502, Installation And Use Manual, Page: 95 / 164

Functional Description
MVME2502 Installation and Use (6806800R96D)
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With this flexible approach to firmware redundancy, one should always be able to recover from
a corrupt active firmware image, as long as a healthy firmware image is maintained in single
bootable SPI Device.
The MVME2502 supports automatic switch over. If booting one device is not successful, the
watchdog will trigger the board reset and it will automatically boot on the other device.
4.6.4 Crisis Recovery
The MVME2502 provides an independent boot firmware recovery mechanism for the
operating system. The firmware recovery can be performed without leaving the firmware
environment.
During crisis recovery, the healthy boot image contained in SPI Device B is copied to SPI Device
A, replacing the corrupt boot image contained in SPI Device A.
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.
The board will automatically switch over if one of the devices is corrupted.