Syntax

do not initialize 
{
  section-selectors
}
[ except
 {
   section-selectors
 } ];

For information about section selectors and except clauses, see Section selection.

Description

Use the do not initialize directive to specify the sections that you do not want to be automatically zero-initialized by the system startup code. The directive can only be used on zeroinit sections.

Typically, this is useful if you want to handle zero-initialization in some other way for all or some zeroinit sections.

This can also be useful if you want to suppress zero-initialization of variables entirely. Normally, this is handled automatically for variables specified as __no_init in the source, but if you link with object files produced by older tools from IAR or other tool vendors, you might need to suppress zero-initialization specifically for some sections.

Example

/* Do not initialize read-write sections whose name ends with _noinit at program start */
do not initialize { rw section .*_noinit };
place in RAM { rw section .*_noinit };

See also

Initialization at system startup, and initialize directive.