Hi All,
I am porting U-Boot to a custom board (ARM920T) and I have to do something about the UART (ns16550.c) driver to support (I know WD would disagree with this :p) XON/XOFF. I have to do this because my board can support only < 19200 baudrates. At 19200 baudrate, I have a functional serial console but downloading binaries using loadb, kermit would always say that the remote host is not reponding (ERROR: Remote Kermit Not Responding). I debugged this on the getc level and verified that my board's U-Boot can accept the first few data from my PC's kermit and then the loadb function hangs, i.e. does not accept any data. I think this is because my UART's FIFO is not handled well, and probably needs software flow control.
How do I register my interrupt routine that would send XOFF data to the PC's kermit whenever an UART trigger (probably when RXRDY pin from NS16550 becomes LOW) occurs. The trigger is of course asserted when the FIFO buffer reaches a certain threshold. I saw the interrupt.c implementation in cpu/arm920t/ but didn't get the information I was looking for, i.e. registering my interrupt routine. Please help me with this.
Thank you very much for your time.
Best Regards,
Rodel Miguel