Quantum LTO 2U Instrukcje Operacyjne Pobierz pdf (Strona 229)

JULY 2007 MAGNUM 224, MAGNUM 448, STORAGELIBRARY T24, OR STORAGELOADER 2U

25-3

WHAT YOU SEND TO THE LIBRARY

25.2 WHAT YOU SEND TO THE LIBRARY

Mode – Byte 01, Bits 2 through 0

The Mode field determines the type of operation to be performed. The library

performs the following operations:

Buffer ID – Byte 02

Valid Buffer ID values are 00h, 01h, and 02h for Mode 010b, write data to

Read/Write Buffer. No distinction is made between these values. For Mode

100b or 101b, microcode download, the Buffer ID 00h should be used.

Buffer Offset – Bytes 03 through 05

The Read/Write Buffer, which is used for microcode storage, is 400100h bytes

in size. The Buffer Offset, plus the Parameter List Length, should not cause

this threshold to be exceeded. If it is, a CHECK CONDITION will be returned.

Parameter List Length – Bytes 06 through 08

The Read/Write Buffer, which is used for microcode storage, is 400100h bytes

in size. The Buffer Offset, plus the Parameter List Length, should not cause

this threshold to be exceeded. If it is, a CHECK CONDITION will be returned.

25.3 USING WRITE BUFFER TO UPDATE THE LIBRARY MICROCODE

The Read/Write Buffer, which holds the microcode being downloaded, is

400100h bytes in size. The file containing the library microcode is the same

length. The file should be downloaded in whatever size pieces are convenient.

The pieces of the file should be sent sequentially starting at Offset 0. Each

block prior to the last should have a Mode of 100b. The Buffer ID should be

00h. The offset should represent the total of all bytes sent in previous

microcode download blocks. The Parameter List Length should be the size of

the block of data being sent.

The last Write Buffer, bringing the amount of data sent, up to the full 400100h

bytes, should have a Mode of 101b, indicating the microcode should be

programmed into the EPROM. On receipt of this block, the code will verify the

validity of the microcode downloaded. If the new code is valid, a GOOD

status response is sent. The tape drive will then program the EPROM and

re-boot.

010b Write data into Read/Write buffer

100b Write microcode to buffer but do not save it to EEPROM

101b

Write microcode to buffer and save entire buffer to

EEPROM

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