You can set the fill pattern for an entire section by using
`=fillexp'. fillexp is an expression
(see Expressions). Any otherwise unspecified regions of memory
within the output section (for example, gaps left due to the required
alignment of input sections) will be filled with the two least
significant bytes of the value, repeated as necessary.
You can also change the fill value with a FILL command in the
output section commands; see Output Section Data.
Here is a simple example:
SECTIONS { .text : { *(.text) } =0x9090 }
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