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Mike Frysinger wrote: |
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> On Thursday 11 October 2007, Jason wrote: |
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>> I'm having a small issue with a Gateworks GW2348-4 [1] ixp4xx board. I |
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>> attached the RXD, TXD, and GND lines from an FTDI USB serial TTL cable |
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>> to the appropriate JTAG pins (RXD, TXD, GND). |
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> |
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> i'm confused ... JTAG != RS232 ... i dont see how you can hook up a RS232 port |
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> to JTAG pins and get a serial console ... |
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Right. The FTDI cable is a usb serial device on one side and 3.3v TTL |
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on the other. The JTAG port on the GW2348-4 has the JTAG pins as well |
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as the 3.3v TTL RXD, TXD and GND for a serial console. I'm still |
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learning this, so I probably have my verbage screwed up. :-) But, I did |
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the same thing on the NSLU2 and it worked flawlessly. |
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>> I can see the bootup messages in minicom, both RedBoot and Linux. It |
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>> dumps me to a command prompt, but that's it. The errors I see are: |
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>> |
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>> 1.) CTRL-C to RedBoot yields periods and doesn't stop the boot process. |
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>> 2.) what I type echoes back, but hitting Enter goes to the beginning of |
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>> the line, and doesn't go down a line. |
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>> 3.) no response to any commands eg 'ls<CR>' does not give me a list of |
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>> directories... |
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>> 4.) I do have Local Echo turned off, so I'm reasonably confident that |
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>> the characters I'm seeing are being seen by the board and echoed back. |
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>> I tried passing minicom '-7' or '-8' with no improvement. I did get a |
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>> chinese character for CTRL-C with '-8' as opposed to a period in RedBoot. |
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>> 5.) I managed to catch the 2sec window to telnet into redboot and load |
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>> my own kernel and rootfs to ram, and execute, but I get the exact same |
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>> effects. |
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>> 6.) The exact same cable, minicom, kernel, and rootfs (made with |
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>> crossdev/xmerge/xkmake for the OT! criers :-) ) works fine when booted |
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>> on an NSLU2... |
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> |
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> so the board never seems to respond and all your output gets echoed back ? |
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> sounds like the hardware wiring isnt correct ... |
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> -mike |
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That's what I'm leaning towards since I had to build my own connector. |
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I was hoping that it was maybe a $TERM problem. On the board TERM=dumb, |
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on my side, TERM=screen or TERM=xterm. But that wouldn't explain it |
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happening in RedBoot. |
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So what kind of wiring error would cause CTRL-C (0x03) and <CR> 0x0d to |
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not get passed correctly, but [a-zA-Z0-9] to go through okay? |
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|
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Jason. |
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-- |
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