Nandblasting not working in one xo

[James Cameron]

That the antenna change did not work shows the problem is in the
wireless card.

You asked why not use the same mechanism as Sugar?

Consider the transmitter performance.

Your network used by Sugar probably has an access point with higher
transmit power and better antenna than the laptop being used as
NANDblaster sender.

So it is perhaps the combination of small damage to one laptop and
large damage to another laptop, that causes NANDblaster to fail.  But
the combination of good access point and large damage causes Sugar
networking to be successful.

See http://wiki.laptop.org/go/Antenna_testing#Link_Budget for a
calculation of wireless success, to see what variables are important.

Does Sugar in ad-hoc wireless mode work between the two laptops?  Or
Sugar in mesh wireless mode with no other laptops nearby?

If so, that's very interesting.

Open Firmware and Linux use different commands sent to the wireless card.

I've checked, and we are using the same wireless firmware 5.110.22.p23
in both Open Firmware and Linux (build 883).

Daniel, do you know of any commands that the Linux kernel may have
sent to the card that may improve signal, even by accident?

On Mon, Jul 09, 2012 at 04:06:16PM +0545, Roshan Karki wrote:
> I tried with antenna change but as you told, didn't work. So I think this is
> the dead end. Thank you for your help. But one question I wonder is in Sugar I
> can use very poor network very well. Why not use the same mechanism in OFW as
> well?
> 
> On Fri, Jul 6, 2012 at 10:41 AM, James Cameron <quozl at laptop.org> wrote:
> 
>     G'day,
> 
>     Thanks for the photographs.  There's nothing wrong that I can see
>     either.
> 
>     Repair may attempt antenna change, but it is unlikely to be fixed with
>     only antenna change.
> 
>     Perhaps the radio module has been damaged.  On XO-1 the module is
>     soldered down and is impractical to replace.  In later models (XO-1.5,
>     XO-1.75) the module is in a socket.
> 
>     --
>     James Cameron
>     http://quozl.linux.org.au/
> 
> 

-- 
James Cameron
http://quozl.linux.org.au/