IBM T200F User Manual download pdf (Page 99)

WRITE BUFFER

Table 107. WRITE BUFFER Command

76543210

0 Operation Code (3Bh)

1 Logical Unit Number (0) Reserved Mode

2 Buffer ID

Buffer Offset

Parameter List Length

9 Control

The WRITE BUFFER command transfers data into the memory on the drive for the

purpose of diagnostics, tests, or firmware upgrade.

If the Mode field is 000b, then the data to be written is sent with a 4-byte header,

which must be set to all zeroes. If the Mode field is 010b, then just the data to be

written is sent.

The Buffer ID field indicates which buffer is to be written.

To download firmware, Modes 100b, 101b, 110b, and 111b are accepted and

handled in the same fashion. Any Buffer ID value in these modes is allowed and

ignored. The code must be downloaded with strictly increasing offsets. If it is not, no

data is written and Check Condition status is generated. The Sense Key is set to

Illegal Request (5) and the ASC/ASCQ is set to Invalid Field in CDB (2400). Ending

status is given when the code has been successfully saved to flash, but before the

drive has initiated its reset.

The Buffer Offset field indicates where in the buffer the data should be written. This

must be smaller than the size of the buffer.

The Parameter List Length field holds the amount of data. This must be smaller

than the difference between the Buffer Offset field and the size of the buffer. If it is

not, no data is written and Check Condition status is generated. The Sense Key is

set to Illegal Request (5) and the ASC/ASCQ is set to Invalid Field in CDB (2400).

Buffers that may be written to are Test, Firmware, and VPD (see “READ BUFFER”

on page 49).

Chapter 2. Command Support 85

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IBM T200F User Manual Page 99