NOR Flash Driver
Command set. Three different command sets are common: Intel, AMD and SST. All
three are supported.
Geometry. A device is composed of one or more regions of identically-sized erase
blocks. Uniform devices contain only one region. Boot-block devices often have one or
two regions of small blocks for code storage at the top or bottom of the device. All of
these are supported by the NOR driver.
Offset
0x10
0x11
0x12
0x13
0x27
0x2A
0x2C
0x2D
0x2F
0x31
0x33
.
.
.
Length (Bytes)
1
1
1
2
1
2
1
2
2
2
2
Contents
Query string “Q”
Query string “R”
Query string “Y”
Command set
Device size, in bytes = 2n
Maximum number of bytes in multi-byte write = 2N
Number of erase block regions = m
Region 1: Number of erase blocks = x + 1
Region 1: Size of each erase block = y * 256 (bytes)
Region 2: Number of erase blocks = x + 1
Region 2: Size of each erase block = y * 256 (bytes)
0x2D + (m-1) * 4
0x2F + (m-1) * 4
2
2
Region m: Number of erase blocks = x + 1
Region m: Size of each erase block = y * 256 (bytes)
Table 15-2 CFI query information
Table 15-2 gives the format of CFI query information. The first three bytes should constitute
the marker string “QRY”, by which the retrieval of correct parameters is verified. A two-byte
command set identifier follows; this must match the identifier for the command set
supported by the physical-layer driver. Beyond is the geometry information: the device size,
the number of erase block regions, and the size and number of blocks in each region. For
most flash, these regions are contiguous and sequential, the first at the beginning of the
device, the second just after. Since this is not always true (see section 15-5-3
161
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