RE: [sdcc-devel] mcs51: contents of internal RAM after reset

[Borut R. <bor...@si...>]

This is from the ISO/IEC 9899 standard:

"If an object that has automatic storage duration is not initialized
explicitly, its value is
indeterminate. If an object that has static storage duration is not
initialized explicitly,
then:
- if it has pointer type, it is initialized to a null pointer;
- if it has arithmetic type, it is initialized to (positive or unsigned)
zero;
- if it is an aggregate, every member is initialized (recursively) according
to these rules;
- if it is a union, the first named member is initialized (recursively)
according to these
rules."

Usually this is done in the way, that everyhing in the data segment, which
is not initialized
explicitly, is initialized to zero. This includes also padding bytes. But it
is not required
by the standard.

Borut