On Sun, May 31, 2009 at 16:09, Tiago Marques <[email protected]> wrote: > On 5/31/09, John Watlington <[email protected]> wrote: >> >> On May 30, 2009, at 12:04 PM, Reinder E.N. de Haan wrote: >> >>> Subject: Xo 1.5 wlan >>> Date: Thu, 07 May 2009 19:56:27 +0200 >>> From: Reinder de Haan <[email protected]> >>> To: John Watlington <[email protected]> >>> >>> Hello, >>> >>> I have a couple of questions regarding the wlan module in xo 1.5; >>> >>> 1) will it be an off the shelf module (3th party) or a quanta/olpc >>> 'private' module >> >> One of the complications of the Gen 1.5 design has been improving >> the WLAN module. The existing module takes lots of power, and >> the USB driver still needs extensive modification to speed up >> suspend/resume. >> > > Being power the major concern, will wireless range also be enhanced in > some way? Most of the early claims that the XO had a top class > wireless range have not materialized, at least when I compare it to > other devices like a Fon2100 or an IPW2200 from Intel, which is > probably the device with best wireless range that I've ever seen. > > A way to change the transmit power in software would be great for > power and range, depending on the application. Does the module have > anything like that or are you just mainly focusing on power and > relegating range to 2nd place?
I think that there have been recent improvements in the algorithm for choosing the transmission power in the linux kernel. I'm not sure if all wifi drivers benefit from it, but a laptop with b43 has improved dramatically its range after updating to Ubuntu Jaunty. Regards, Tomeu > Best regards, > > Tiago Marques > >> Unlike Gen 1, we don't have the time or expected market to >> develop and certify a custom module. >> >> The current plan is to use an existing WLAN module, based on >> the Marvell 88W8686 and connected to the system using an >> SDIO interface. >> >>> 2) if it is a private module please break out jtag and the serial port >>> for debugging (xo 1.0 only had jtag.. serial ended right at the >>> balls of >>> the chip :-( >> >> Sorry, the module doesn't bring any of the internal debugging signal >> out. >> >>> 3a) if its a 3th party moduel is it posible to buy it somewhere ? >> >> Yes and no. There are 88W8686-based SDIO modules already >> available, and electrically/software-wise they will be identical to the >> one we are planning to use. >> >> The actual module used in XO-1.5 will have a half-height miniPCI-e >> form factor. Even if you could buy it in small quantities, you >> would have >> to arrange an adapter board to use internally. >> >> Cheers, >> wad >> >> _______________________________________________ >> Devel mailing list >> [email protected] >> http://lists.laptop.org/listinfo/devel >> > _______________________________________________ > Devel mailing list > [email protected] > http://lists.laptop.org/listinfo/devel > _______________________________________________ Devel mailing list [email protected] http://lists.laptop.org/listinfo/devel
