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SCSI Commands

Quantum DLT 8000 Tape System 5-225

WRITE BUFFER Command (3Bh) (continued)

The tape drive must be empty of tape medium to allow downloading of an image. This is

a safeguard against accidentally starting a firmware update. If a tape cartridge is loaded

when all or part of a firmware image has been downloaded, another WRITE BUFFER

with Download Microcode mode will be rejected. The firmware image must be

downloaded in integral multiples of 8K bytes.

Any error on a WRITE BUFFER command causes any downloaded image data to be

discarded and the download must be restarted from the beginning.

CAUTION

During the actual reprogramming of the FLASH EEPROM, if any type of powerfail

occurs, or if the reprogramming fails before completion, the tape drive subsystem

becomes unusable and the tape drive must be replaced.

5.32.4 Download Microcode and Save Mode (101b)

This mode is used to download and save the entire image at once, or to download the

image and save it, or to cause a save operation after the image data has been

downloaded using the Download Microcode mode (without the Save). This mode of the

WRITE BUFFER command causes the image data to be verified and the Flash EEPROM

firmware area to be updated. During the reprogramming of the Flash EEPROM, the

WRITE PROTECT and Drive Activity LED’s on the drive’s front panel blinks. Also,

when it is updating the EEPROM, it disconnects from the SCSI bus and will not respond

until the update is complete.

When the Save operation is successfully completed, the firmware restarts itself, causing

the Power On Self Test (POST) to be run, and two UNIT ATTENTION conditions are

generated: POWER UP RESET and OPERATING CODE HAS CHANGED.

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Quantum DLT 8000 Handbuch Seite 369