Serial Ports on USB

Serial Ports on USB

[Charles A. Jolley]

Hi all:
    I know I can get a Serial Port-to-USB adapter (from Keyspan) but is this
device supported by linux?  I am developing a new PowerPC-based operating
system kernel right now (not based on Linux sources) and up until this point
I have just connected via serial ports to access my debugger and get capture
reports from the kernel.  I am now needing to upgrade my development
workstation and I would like to upgrade to an iMac or B&W G3, but only if I
can still connect to the test workstation.  Is there anyway that I can do
this?

    And while I'm on this topic, I would really like to get my kernel
booting on an iMac, but I'm not sure how to access my debugger, etc. without
having video, keyboard, or serial support.  How was this done when getting
LinuxPPC up on the iMac?

-Charles


    

[[ This message was sent via the linuxppc-dev mailing list.  Replies are ]]
[[ not  forced  back  to the list, so be sure to Cc linuxppc-dev if your ]]
[[ reply is of general interest. Please check http://lists.linuxppc.org/ ]]
[[ and http://www.linuxppc.org/ for useful information before posting.   ]]

Re: Serial Ports on USB

[Charles A. Jolley]

>From: Nathan Hurst <njh@drongo.anu.edu.au>

> On Fri, 9 Jul 1999, Charles A. Jolley wrote:
>
>>     And while I'm on this topic, I would really like to get my kernel
>> booting on an iMac, but I'm not sure how to access my debugger, etc. without
>> having video, keyboard, or serial support.  How was this done when getting
>> LinuxPPC up on the iMac?
>
> network?
>

Network was my first thought as well...but then you have to support the
ethernet card and some protocol stack (most likely TCP/IP) to get much use
out of it...

But then I realized that in fact the answer is simple:  Why not use the
modem?  The iMac documentation says it appears as a serial port that
responds to AT commands and from the looks of the OF tree and the Linux
source, this is the case at the hardware level (unlike ADB compatibility,
which is done via software shims...)  A null modem cable and (maybe) a few
AT initialization commands at startup to put the modem into online mode
ought to do the trick...this will be easier than I thought.

-Charles

[[ This message was sent via the linuxppc-dev mailing list.  Replies are ]]
[[ not  forced  back  to the list, so be sure to Cc linuxppc-dev if your ]]
[[ reply is of general interest. Please check http://lists.linuxppc.org/ ]]
[[ and http://www.linuxppc.org/ for useful information before posting.   ]]

Re: Serial Ports on USB

[Peter Handel]

On Wed, 14 Jul 1999, Charles A. Jolley wrote:

> > Connected an Amiga 500 and an Apple 2gs.

Apple IIGS Forever! :)  I should be back to serving web pages from my
IIGS shortly.  Too bad GS/TCP probably won't see the light of day
ever.

> I'll try things out next time I have a chance to go pick up the
> parts I need to make a cross-over phone cable.

You don't need a cross-over phone cable (this isn't ethernet :)   ); a
regular one will do just fine.


Thanks,
Pete

-- 
Peter F. Handel          "[The anti-Christ] also forced everyone, small and
phandel@cise.ufl.edu      great ... to receive a mark [smart card?] on his
www.cise.ufl.edu/~phandel right hand or on his forehead, so that no one could
FAX: (561) 619-8051       buy or sell unless he had the mark"-Revelation13:16
> > You are perfectly free to believe what you want to, and so am I.
> Actually, this turns out not to be the case. God does not give us
> the freedom to believe anything we wish. We are morally obligated to
> believe the truth. Doing anything else is a sin. You are not free to
> interpret the Bible anyway you wish. -DFL (Pretty neat, huh?)


[[ This message was sent via the linuxppc-dev mailing list.  Replies are ]]
[[ not  forced  back  to the list, so be sure to Cc linuxppc-dev if your ]]
[[ reply is of general interest. Please check http://lists.linuxppc.org/ ]]
[[ and http://www.linuxppc.org/ for useful information before posting.   ]]