The assignment of a variable can be done as shown:

FOO = "bar"

In the preceding example, the value of the variable FOO is bar.

The variable assignment is core to the BitBake metadata syntax as most other examples are performed using variables.

BitBake supports variable referencing. The syntax closely resembles Shell Script, for example:

A = "aval"
B = "pre${A}post"

This results in A containing aval and B containing preavalpost. One important thing to bear in mind is that the variable only...