That is an awesome bit of troubleshooting software for repair centers to know about. is this all written up on the wiki somewhere?
cjl On Fri, Jun 29, 2012 at 5:58 AM, James Cameron <qu...@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: > > http://dev.laptop.org/~quozl/q2f12jf.rom > > 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 > time. > > On Fri, Jun 29, 2012 at 02:19:34PM +0545, Roshan Karki wrote: >> Hi, >> >> 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 >> here? >> >> Thanks. > > -- > James Cameron > http://quozl.linux.org.au/ > _______________________________________________ > Devel mailing list > Devel@lists.laptop.org > http://lists.laptop.org/listinfo/devel _______________________________________________ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
