loadtools/scripts: gtm900.config renamed to gen4.config It turns out that a GTM900 variant exists with 8 MiB flash, thus -h gen8 needs to be used for GTM900 modules as the general case, and the old -h gtm900 config is best renamed to -h gen4, although not currently official for any actual target.

#define	ERROR_USAGE	1
#define	ERROR_TARGET	2
#define	ERROR_RVINTERF	3
#define	ERROR_UNIX	4
#define	ERROR_BUG	5
/* the following two are for fc-rfcal-tools */
#define	ERROR_RFTEST	6	/* error in the external RF test equipment */
#define	ERROR_RFFAIL	7	/* RF calibration process failure */