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<small>Hi All,<br>
<br>
I am making slow progress but now running in problems with
building the kernel. Turns out </small><small>arm-linux-gnueabi-objdump
segfaults with the following: </small><br>
<small><br>
/bin/sh: line 1: 6174 Segmentation fault
arm-linux-gnueabi-objdump -D standby.elf > standby.lst<br>
<br>
Complete log: <a class="moz-txt-link-freetext" href="http://pastebin.com/Cc9jdxd8">http://pastebin.com/Cc9jdxd8</a><br>
<br>
After following instructions from
<a class="moz-txt-link-freetext" href="http://rhombus-tech.net/allwinner_a10/kernel_compile/">http://rhombus-tech.net/allwinner_a10/kernel_compile/</a> (I have
gcc-4.4-arm-linux-gnueabi from the Ubuntu repo)<br>
<br>
As a side question, is this kernel in any way specific to the Mele
or is it the same for all A10s? In the later case, would it make
sense to have a PPA or a Deb repo with a built kernel available,
or even a .deb we can download?<br>
<br>
Cheers,<br>
<br>
Julien<br>
<br>
On 03/23/2012 04:22 PM, Henrik Nordström wrote:</small>
<blockquote cite="mid:1332490931.6345.21.camel@hlaptop.hno.se"
type="cite">
<pre wrap="">fre 2012-03-23 klockan 10:34 +0800 skrev <a class="moz-txt-link-abbreviated" href="mailto:julien@forgeat.name">julien@forgeat.name</a>:
</pre>
<blockquote type="cite">
<pre wrap="">Received the USB TTL Serial/UART module :-)
</pre>
</blockquote>
<pre wrap="">
Great!
</pre>
<blockquote type="cite">
<pre wrap="">As Alejandro stated, the 2.54mm cable connectors do not fit, we can at
most fir two out of 4, maybe 3 but that would be risking breaking
something ^^
</pre>
</blockquote>
<pre wrap="">
Yes..
you can strip the middle cable connector from it's plastic to cut down
size a bit, which may allow you to fit GND, Rx, Tx
Also pay attention to order of Rx and Tx. These needs to be crossed. Rx
on your cable to Tx on mele, Tx on cable to Rx on mele.
</pre>
<blockquote type="cite">
<pre wrap="">But then, I have been thinking:
(1) the 3.3V Vcc is apparently not always needed (is it only if the
cables are very long?)
</pre>
</blockquote>
<pre wrap="">
If you have a fixed voltage (including voltage selected by jumper)
serial cable then Vcc is not needed.
The 3.3V pin in the serial port is for serial cables with variable
voltage level. So you should leave this unconnected in most cases.
The only case when you should connect the serial port 3.3V to the serial
cable is if you use a buffered/isolated cable with variable voltage
level and requires a VREF/VIO reference power driving the I/O logics at
the right level for the board.
Almos all cables have fixed I/O voltage level (single, or selected by
jumper), and on these you should leave the VCC unconnected. If the cable
do have a VCC pin then you MUST NOT connect VCC. The VCC pin provided in
the cable is for powering the device you connect to.
</pre>
<blockquote type="cite">
<pre wrap=""> (2) 2 cables fit in the connector
(3) We should be able to get ground from somewhere else on the board
</pre>
</blockquote>
<pre wrap="">
Yes.
</pre>
<blockquote type="cite">
<pre wrap="">So is it dangerous the connect Rx and Tx on the UART port, Ground on
the USB port and not to connect Vcc (or why not, get Vcc from the USB
port)?
</pre>
</blockquote>
<pre wrap="">
ground should work.
But DO NOT connect VCC from there. You will likely destroy something.
* Your cable do not have a VREF/VIO connection
* VCC of your cable is 3.3V. USB uses 5V.
Connecting VCC of your cable to USB you short the 3.3V serial cable
power output to a 5V power usb power output, and BAD things are likely
to result, possibly (but probably not) involving magic blue smoke
leaving the A10 CPU or usb serial chip if not 5V tolerant.
Regards
Henrik
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</pre>
</blockquote>
<br>
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