It turns out that a defective and counterfeit Prolific PL2303 was at play (more information here: http://goo.gl/yoMgof). Whether the latter feeds into the former is an open question, but it most certainly is a counterfeit given the cut-section images!
I had borrowed one friends PL2303 and swapped it with another, and everything works perfectly. On Tue, May 12, 2015 at 2:41 AM Paul Bartell <[email protected]> wrote: > It really sounds like a baud rate mismatch. Try a few other standard ones > and see what happens there? (9600, 19200, 38400, 57600, 115200). > > It sounds like you might have local echo enabled on your openbsd terminal > emulator. That's why the terminal might appear to be read/write instead of > just read. > > A second step would be to test the null modem adaptor with two serial > ports connected together. You should see characters typed into one of the > ports show up on the other. > On Mon, May 11, 2015 at 1:30 PM Matt T. Proud ⚔ <[email protected]> > wrote: > >> Answers inline: >> >> On Mon, May 11, 2015 at 10:13 PM ED Fochler <[email protected]> >> wrote: >> >>> The long list of repeated characters matches reality well enough that I >>> would suspect a baud mismatch. Try 9600 or 38400 and see what you get. >>> >> >> Just did. Same story, but different garbage patterns. FWIW, the >> terminal programs act "read-only" on Mac OS but appear act both read-write >> from OpenBSD. This is to say, I see acknowledgement of my key presses from >> terminal in OpenBSD only. >> >> >>> >>> Can you verify your USB + null modem against any known-good equipment? >> >> >> Sadly I have no other equipment to test it with. I suspect I have a >> traditional RS-232 port at my office, so I will try my null modem with that >> one. >> >> >>> I use the keyspan USA-19HS. The serial adapters are finicky, and you >>> certainly could have a bad one. >>> >> >> Good to know. IIRC, that one uses FTDI chipset, which could be >> problematic from an OpenBSD host. I just put in an order for one to >> experiment with. >> >> Thank you for the prompt reply, >> >> Matt >> >> >>> >>> ED. >>> >>> > On 2015, May 11, at 3:35 PM, Matt T. Proud ⚔ <[email protected]> >>> wrote: >>> > >>> > Hi all, >>> > >>> > I am writing to inquire if you have any tips into the following >>> predicament: >>> > >>> > I have a brand-new 6501 that I received from Soekris Europe. I just >>> plugged in the null modem cable, added a Prolific PL2303 serial-to-USB >>> adapter, connected to the Soekris, setup the terminal (19200; 8-bit data; >>> no parity; 1 stop-bit; flow-control disabled), and booted the device. >>> > >>> > To my dismay, I get garbage over the terminal. I have tried GNU >>> Screen and Serial. The PL2303 offers /dev/cu.usbserial and >>> /dev/tty.usbserial, both of which I have tried. I have also cycled Screen >>> and Serial through each of the supported bauds. >>> > >>> > I had been planning on installing OpenBSD to the host (am familiar >>> with the 9600 baud reset I need to do) connected to a Mac OS X host >>> (Yosemite), but I couldn't even see an intelligible boot screen to reset >>> the the baud in the ComBIOS (CTRL+P). >>> > >>> > This screenshot will give you an idea of what I am getting at the >>> factory connection settings: http://imgur.com/EucjEFn. >>> > >>> > I also, FWIW, setup OpenBSD on VirtualBox and used USB passthrough to >>> speak to the Soekris. Same garbage: http://imgur.com/iPmKqnY. >>> > >>> > Any ideas? What should my next steps be? Is there some sort of a >>> factory reset I can do? Could my unit be defective? As I mentioned, I >>> have not been able to set any settings with the device. How likely is it >>> that the Prolific PL2303 that I am using is faulty? >>> > >>> > Kindest regards, >>> > >>> > Matt >>> > _______________________________________________ >>> > Soekris-tech mailing list >>> > [email protected] >>> > http://lists.soekris.com/mailman/listinfo/soekris-tech >>> >>> _______________________________________________ >>> Soekris-tech mailing list >>> [email protected] >>> http://lists.soekris.com/mailman/listinfo/soekris-tech >>> >> _______________________________________________ >> Soekris-tech mailing list >> [email protected] >> http://lists.soekris.com/mailman/listinfo/soekris-tech >> >
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