Re: [grub-devel] loongson-2f mini-pc (fuloong) elf image generation.

["Aleš Nesrsta" <starous@volny.cz>]

>>> ...
>>> Hmm, I can access one laptop with 9 pins RS-232 port.  The mini-pc is
>>> a 3 pins serial port.  I don't currently have a way to connect them.
>>>
>>> I'll have to buy a some cable/converter...
>>>
>> Cable is shipped with fuloong. It's straight passive cable to RS-232.
>
> Thanks for that...  I just found it (took me a while, since I totally
> forgot about it)...
>
> I still need to buy a male to female adapter, and/or a serial to usb
> converter.  The laptop has a male port, and the lemote cable has a
> RS-232 male port also, :-(  Perhaps those are easier to find...

It is usually possible to buy/rent/borrow serial null-modem cable - it 
should have female CANON 9-pin connector on both sides.
(Don't mix up null-modem and pass-through cable! Pass-through cable will 
not damage Your computer(s), but it will not work in our case... 
Pass-through cables were used to connect PC with telephone modems. For 
debugging, i.e. to connecting two PCs peer to peer via serial line, it 
is necessary null-modem cable which have "crossed" some signals, at 
least RxD with TxD.)

Or You can buy two female CANON 9-pin connectors and connect together 
these pins:

1-st side 2-nd side
-------------------
2	- 3
3	- 2
5	- 5
(i.e., You need only three wires)

You can find many other wire-diagrams of null-modem cable with more 
complex wiring on the Internet - You can use most of them, of course - 
but the three connections, which I wrote above, should be enough - 
because another signals should be not used in serial debugging case.

If You are not friend of soldering gun, You can also use part of flat 
ribbon cable and related clamping connector e.g. like this: 
http://www.conrad.com/ce/en/product/711357/Assmann-WSW-A-DSF-09-LPIIIZ-D-SUB-For-Ribbon-Cable-Number-of-pins-9-Plug-Cable-Mount-Cutting-clamping-technology

BR,
Ales

>
> Thanks,
>