mmap lpc2478 uClinux / Olimex

Development Boards MicroMod
1

Hello,

i’m trying to write into the framebuffer of the lpc2478_stk / uCLinux.

char* screen;
struct fb_fix_screeninfo fix_info;

fb = open("/dev/fb0", O_RDWR);

ioctl(fb, FBIOGET_FSCREENINFO, &fix_info);

screen = mmap(NULL, fix_info.smem_len, PROT_READ|PROT_WRITE, MAP_SHARED, fb, 0);

→ mmap alway returns -1 :frowning:

Is there any compiling/linking flag i have to set for this? or something i have to set up in kernel-options?

Thanks for any help/hint.

Ralf