<div dir="ltr"><br><br><div class="gmail_quote">On Wed, Oct 5, 2011 at 10:18 AM, Baruch Siach <span dir="ltr"><<a href="mailto:baruch@tkos.co.il">baruch@tkos.co.il</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Hi Erez,<br>
<div class="im"><br>
On Wed, Oct 05, 2011 at 09:53:02AM +0200, Erez D wrote:<br>
> In the sheevaplug (actually i tested the dockstar).<br>
> i got the dockstar for 50USD in israel (used it as an eval board)<br>
> it has a 1GB ethernet, i read reports saying it is able to acheve actual<br>
> around 320Mbps rates as a router.<br>
> i was able to utilize it's serial port at 16Mbps. it is not the 30Mbps i<br>
> wanted, but will do for now.<br>
<br>
</div>Wow. I didn't know that these rates are at all possible with a regular serial<br>
port. Did you do any special kernel modifications for this? Or is the BOTHER<br>
thing from include/asm-generic/termbits.h enough to make it just work?<br>
<br>
What limitation prevented you from doing 30Mbps, if I may ask?<br>
<br></blockquote><div>The serial baud rates are derived from a clock, which is divided by a divider (and then usually divided again by 4).<br>you can set the baud rate to any tandard one (if supported by hardware).<br>however you can simply supply the divide_by value (if hardware supports that, not all hw does, many usb-serial e.g. pl2303 based , does not support that).<br>
with setserial, you first set the baud to 38400, then enable speed_cust, then set the divider to a value you want<br>with divider=1 i got around 13 or 16 Mbps.<br>as serial port usually uses a clock divided by 4 ( in addition to be divided by the divider), <br>
i guess the clk speed is around 13*4= about 50 Mhz.<br><br>so it seems the maximum speed should be around 13Mbps. full duplex of course.<br><br>The problem with the dockstart (i think it is with any sheevaplug) is that the hardware flow control pins are unavailable (without soldering + updating the driver) so i work with xon/xoff. <br>
<br>erez. <br></div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
baruch<br>
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