Thanks a lot for the hint, the difference is there :
on the machine where the programs ran i got the ouput: # dmesg |grep ttyS [ 0.331367] serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A [ 0.640601] serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A [ 0.720856] 00:0d: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A [ 0.752633] 00:0e: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A [ 0.784232] 0000:00:03.3: ttyS4 at I/O 0x1c90 (irq = 17) is a 16550A While on the machine where they didn't , nothing is displayed , I mean # dmesg |grep ttyS # So How to activate the ports !!! thanks a lot regards bela
