Hi,
I'm trying to use the sprintf function in a C program written for U-boot. As far as I understand, to get the function I have to add it to the exports.h, _exports.h and exports.c file as per the README.Standalone file in /doc (the function is declared in common.h). Now if I do this, the program compiles fine, and all is dandy, until I actually start using the function. It generates garbage. printf and alike works fine, and the program runs like it should, except the places where sprintf is used, I get garbage (meaning some environment variables are looking pretty nasty since the result of the sprintf functions are used for these). When compiling I link to the examples/libstubs.a file and lib_generic/libgeneric.a where the code I'm using should be present. Can anyone give me a clue to what the problem could be or if I misunderstood the concept completely? I searched the lists and in my frustration I tried to use some code from an earlier post where some guy had problems with sprintf. Here Wolfgang Denk wrote a small piece of code that used the function, and this was what I then put in my own code, just to see if I could get *anything* working with sprintf. The code I used was this: ... unsigned char buf[128]; unsigned char a[6] = { 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, }; int i; ... printf ("Before: "); for (i=0; i<6; ++i) printf (" %02X",a[i]); putc ('\n'); sprintf (buf, "%02X:%02X:%02X:%02X:%02X:%02X", a[0], a[1], a[2], a[3], a[4], a[5]); printf ("After: "); for (i=0; i<6; ++i) printf (" %02X",a[i]); putc ('\n'); printf ("buf="%s"\n", buf); ... When I do this, the line that defines the a[6] thing generates a compiler error stating an undefined reference to memcpy. Since this error is present every time I try to initialize a string (char*) or char array I'm guessing this might be the problem, but I'm not sure...
The platform is ARM (AT91RM9200)... U-boot version is 2009.06.
I'm new to standalone programming for U-boot so this might surely be the problem, so any help is appreciated :)
Kind regards, Martin Hejnfelt