Some more input: The problem was related to this code:

typedef struct _screen_config screen_config;
struct _screen_config
{
int type; /* type of screen */
int width, height; /* default total width/height (HTOTAL, VTOTAL) */
rectangle visarea; /* default visible area (HBLANK end/start, VBLANK end/start) */
UINT8 oldstyle_vblank_supplied; /* MDRV_SCREEN_VBLANK_TIME macro used */
attoseconds_t refresh; /* default refresh period */
attoseconds_t vblank; /* duration of a VBLANK */
bitmap_format format; /* bitmap format */
float xoffset, yoffset; /* default X/Y offsets */
float xscale, yscale; /* default X/Y scale factor */
};

As you can clearly see the structure is not 32 Bit aligned starting at "refresh" (attoseconds_t is a long long, bitmap_format also a 32 Bit value, and rectangle consists of 4 int's BTW). I *did* recompile with -mstrict-align (I forgot to add -mstrict-align to the linking command, is this a problem? Or is it only needed on compiling) and it still happened.

Now I am trying a different thing, including 3 Pad-Bytes after the UINT8 (well, let's hope there are not more such things...).

Any input welcome


And I would be interested in a non-Sam-tester, to see if the problem only happens on Sam! The person would need a ftp site, though, as the file is too big for email.

Steffen