Richard A. Smith
richard at laptop.org
Tue Aug 4 11:47:05 EDT 2009
> Somehow every time I asked about debugging in these forums I have got no
> answer at all. Now I have a weak feeling that Linux developers are "real
> programmers" who do not use debuggers. I hope it is not the case... :)
>> > 2.
Or they are just busy...
>> Another issue is that this serial stuff will be loaded much later than
>> kernel start so if I define "console=/dev/ttyUSB0" in the kernel
>> parameters and the device will be created later then will Linux pick
>> up the device at that time?
If you want a USB serial console early then you have to compile the USB
serial drivers statically into the kernel and verify that your initrd
will have a /dev/ttyUSB0 ready for use.
> plug into the serial cable, the serial cable's plug into the FTDI bridge
> and the bridge into the XO-1. Then I started getty ttyS0 or something
> similar and nothing happened. Exactly how could I test the setup?
You should spend some time with google learning about how rs232/serial
connections work both hardware and software. Otherwise there is a large
amount of terminology that you won't understand in any help you receive.
Step one in debugging serial connections is a loopback device which
shorts TX and RX so you can test each part of the chain.
Richard Smith <richard at laptop.org>
One Laptop Per Child
More information about the Devel