User guide

Names and Symbols

The following table lists typographical conventions used for names of various

items throughout this manual.

Items Example

Bits sysBus<32:2>

Commands boot command

Command arguments address argument

Command options -sb option

Environment variables AUTO_ACTION

Environment variable values HALT

Files and pathnames

/usr/foo/bar

Pins LIRQ pin

Signals iogrant signal

Variables n, x, mydev

Note

Notes emphasize particularly important information.

Numbering

Numbers are decimal or hexadecimal unless otherwise indicated. The preﬁx

0x indicates a hexadecimal number. For example, 19 is decimal, but 0x19 and

0x19A are hexadecimal (see also Addresses). Otherwise, the base is indicated by

a subscript; for example,

is a binary number.

Ranges and Extents

Ranges are speciﬁed by a pair of numbers separated by two periods (..) and are

inclusive. For example, a range of integers 0..4 includes the integers 0, 1, 2, 3,

and 4.

Extents are speciﬁed by a pair of numbers in angle brackets (<>) separated by a

colon (:) and are inclusive. Bit ﬁelds are often speciﬁed as extents. For example,

bits <7:3> speciﬁes bits 7, 6, 5, 4, and 3.

(low-order) and increasing to the left (high-order).

Memory ﬁgures have addresses starting at the top and increasing toward the

bottom.

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