GE MAC 3500 Service Manual page 107

Revision L
Maintenance: Main CPU Board Replacement
If the boot code on the device and the boot code on the SD card are the

same version, the following meesages are displayed:
Programming Over
System will shut down
Press any key to continue...
Press any key to shut down the device. Skip to step 8.
If the boot code on the device and boot code on the SD card are different

versions, the following messages are displayed.
Current Boot Version: xx.xx
New Boot Version: yy.yy
Press 'Enter' to start installation
Proceed to step 7.
7. Do one of the following:
To cancel the update to the boot code, press any key other than Enter. 

The following messages are displayed:
Boot code not updated.
Can update later from service setup
To update the boot code, press Enter.

The following messages are displayed:
Programming Primary Boot
Programming Over
System will shut down
Press any key to continue...
Press any key to shut down the device.
8. After the device shuts down, press Power to restart the device.
9. On the Resting ECG screen, verify the software version has been updated.
Installing the software when the user interface is
unavailable
Use this method to install the software application on devices on which the user
interface is not available. This will typically be in cases where the application
software cannot be found on the device.
On device boot up, the boot loader program built into the ATMEL AT91RM9200
processor fetches the primary boot code from the SPI data flash. The primary boot
code contains a small application that updates the main software application in the
device's NAND FLASH memory.
If the primary boot code cannot find a valid software application in the NAND
FLASH, or even if it can, it looks for a special SD card with a dummy file named
update.com in the card's root directory. If it detects the SD card, it downloads the
software application code from the SD card to the NAND FLASH and shuts down
MAC™ 3500 Resting ECG Analysis System
2021337-036
5-25