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

[Bernhard H. <ber...@be...>]

AFAIK the contents of the internal RAM is undefined after a power up reset. 

Therefore all global or static variables must be initialized, even if they are 
zero and in IRAM.

If the the whole IRAM is filled with $a5 by adding the line
   fill iram 0 0xff 0xa5
to uCsim.cmd, a lot of tests will fail.

zeropad_storage_idata.c
	struct x {
	  short a;
	  char  b[10];
	};

	struct x idata teststruct[3] = {
	  { 10, {  1, 2, 3, 4, 5} },
	  { 20, { 11 } },
	  { 30, {  6, 7, 8} }
	};

        The padbytes are not initialized to 0.

bug-227710.c
	struct {
	    unsigned char index;
	} s;

	s.index isn't initialized to 0.


Please correct me, if I'm wrong. Otherwise I'll file a bug report.

Bernhard