Nandblasting not working in one xo
cjlhomeaddress at gmail.com
Fri Jun 29 14:56:38 EDT 2012
That is an awesome bit of troubleshooting software for repair centers
to know about. is this all written up on the wiki somewhere?
On Fri, Jun 29, 2012 at 5:58 AM, James Cameron <quozl at laptop.org> wrote:
> G'day Roshan,
> I understand NANDblaster is not starting on a specific XO-1.
> This might happen if an antenna is damaged; even if you can use
> internet from Sugar. Open Firmware configures the wireless card
> somewhat differently to Linux.
> We have a new antenna test function in development. This firmware
> update contains it:
> You need an open wireless access point to run the test, but there does
> not need to be any IP network behind the access point.
> The test is used thus:
> ok essid NETWORK
> ok test-antenna
> Where NETWORK is the wireless access point name.
> During the test the following data are displayed:
> - beacon received signal strength indicator, in dB,
> - beacon signal to noise ratio, in dB,
> - receiver noise floor, in dBm,
> - average values of the above three data,
> - receive and transmit antenna allocation.
> For your problem, the "avg rssi" value is the most indicative. You
> should find it will react by decreasing (larger negative numbers) as a
> result of stowing the antenna and placing a hand over the whole
> antenna area. Usually one antenna will be in use, and you can
> find which one it is by changing which side of the laptop you cover.
> During the test there are keyboard keys with special meaning:
> - key 1 to select antenna 1,
> - key 2 to select antenna 2,
> - key s to perform network scan,
> - key a to deassociate and reassociate with access point.
> By default on power up reset, both antennas are selected, and this is
> called diversity mode, shown as "d". (However, the "d" key does not
> effectively restore this mode after keys "1" or "2". A wireless card
> reset is probably needed.)
> The test can be used to indicate the performance of antenna,
> transmission coax, termination, socket, antenna switch, and receiver.
> But there are sources of unreliability in the test:
> a. the radio noise environment,
> b. the precise position of the antenna or laptop, such as in a null,
> These sources of unreliability make comparisons difficult, but if you
> see substantially different values greater than 20 dB between the two
> antennas, I suggest one may be damaged.
> The test also does not test transmit by the laptop, only receive.
> Since NANDblaster should only receive, this is okay.
> If you identify an antenna as damaged, schedule the laptop for a
> detailed repair. Look carefully at the coax cable leading from the
> laptop to the axle of the antenna.
> If both antennas are performing fine in this test, then it is time for
> me to dig deeper. I'll next be available to do that on Tuesday your
> On Fri, Jun 29, 2012 at 02:19:34PM +0545, Roshan Karki wrote:
>> Similar to this problem, http://lists.laptop.org/pipermail/devel/2009-October/
>> 025769.html nandblasting is not working in one xo while it works flawlessly in
>> 10 others.
>> Nandbalsting simply doesn't start in that problematic xo. OFW test-all reports
>> no error and I also can connect and use Internet from sugar. Though all of the
>> xo in sets have same firmware I even tried updating the firmware to latest
>> version to see if it would help.
>> "open-wlan 6 multinand-traffic? . close-wlan" doesn't return ffffffff. I tried
>> changing server, starting them in different channel. What could be the problem
> James Cameron
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> Devel at lists.laptop.org
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