The kernel which has thinfirm is at: http://download.unleashkids.org/xsce/downloads/os/xo1.5/kernel-3.3.8_xo1.5-20160102.1250.06CE.8ddad46.i686.rpm
And there's an Internet In a Box image with AP function all set up at: http://download.unleashkids.org/xsce/downloads/os/xo1.5/160210_xo1.5_ap.img.zip ready to dd onto an SD card (minus content). On Sun, Apr 3, 2016 at 4:39 PM, James Cameron <qu...@laptop.org> wrote: > Thanks, very interesting. > > The wireless card contains an ARM processor, and that's what the > firmware runs on. > > Yes, the firmware had proven to be stable when used by Open Firmware > for NANDblaster function, but Open Firmware uses a subset of the > commands supported. > > On the other hand, Linux uses many more commands, and so is likely to > expose any undiagnosed problems in the firmware, which cause the card > to hang and the driver to cease traffic. > > Some work was done upstream in the past year for mwifiex/mv8787 > recovery after firmware hang, but I've not noticed any recent work on > libertas. > > My gut feel is that your random observation ping results are missed > receive interrupts; a packet is being received late just after the > system sends the card an unrelated command, and you might observe a > response to tuning of the ping interval. > > Do you have your latest kernel source available anywhere? > > On Sat, Apr 02, 2016 at 11:44:03AM -0700, George Hunt wrote: > > The recent SD cards are so cheap, and wikipedia in various languages is > such a > > good replacement for the encyclopedia I devoured as a kid, I spent a few > weeks > > on this project. > > > > The results were mixed, but just not good enough. The XO1.5 can act as a > > gateway for a few minutes, or a few hours (with apparently random > delays to > > the point of failure). But eventually, the libertas thinfirm driver, or > > firmware, gets to be unresponsive, and only a reboot will correct the > > situation. > > > > History > > The libertas AP function was developed by OLPC in the 2010 timeframe > (and used > > successfully by openfirmware for flashing many XO at a time). I'm not > clear > > whether "thinfirm" firmware was generated by marvel, or modfied by > outside > > consultant, cozybit under nondisclosure agreement., This firmware may > have > > removed some function, but added AP capability. The driver was modified, > in > > order to add the sdio interface (the OLPC motherboard uses SDIO interface > > rather than the pre-existing usb driver interface). The thinfirm driver > (with > > USB interface) has been upstreamed, and accepted into the kernel. But > the SDIO > > interface modifications to the driver have not. More recently discovered > sdio > > code has not been tried (2) -- or maybe it's the same in a different > package. > > > > Olpc documentation of the AP function existed, and I tried to follow the > > instructions (1)(4)(7) > > > > Jerry Vonau found a patch for sdio interface to thinfirm, which was the > one I > > tested (5). If I were to continue, I'd probably try the patch at (2) > since it's > > more recent. > > > > There are references to setting the libertas_tf driver into debug mode, > which I > > did not pursue, since I'd need to learn a lot more about wireless > protocols, to > > make use of the debugging information.(6) But that's probably what I > would need > > to do if I continued. > > > > Random observation: > > if a wifi client is connected to an XO1.5 acting as AP, and both the > client > > and the server are set to ping one another, the client ping delays are > > constant. but the server delays are bi-modal, either 5ms or 230ms. > > > > 1. [1]http://wiki.laptop.org/go/Thinfirm_1.5 > > 2. [2]http://www.sleepyrobot.com/?p=160 -- > > 3. [3] > http://dev.laptop.org/git/users/derosier/wireless-testing/tree/drivers/ > > net/wireless/libertas_tf > > 4. [4]http://wiki.laptop.org/go/Libertas_Thinfirmware_HOWTO > > 5. [5]http://www.spinics.net/lists/linux-wireless/msg55208.html > > 6. [6] > http://labs.isee.biz/index.php/How_to_setup_Marvell_88w8686_SDIO_wifi# > > How_to_debug_the_libertas_driver > > 7. [7]http://wiki.laptop.org/go/XO_as_AP > > > > References: > > > > [1] http://wiki.laptop.org/go/Thinfirm_1.5 > > [2] http://www.sleepyrobot.com/?p=160 > > [3] > http://dev.laptop.org/git/users/derosier/wireless-testing/tree/drivers/net/wireless/libertas_tf > > [4] http://wiki.laptop.org/go/Libertas_Thinfirmware_HOWTO > > [5] http://www.spinics.net/lists/linux-wireless/msg55208.html > > [6] > http://labs.isee.biz/index.php/How_to_setup_Marvell_88w8686_SDIO_wifi#How_to_debug_the_libertas_driver > > [7] http://wiki.laptop.org/go/XO_as_AP > > > _______________________________________________ > > Devel mailing list > > Devel@lists.laptop.org > > http://lists.laptop.org/listinfo/devel > > > -- > James Cameron > http://quozl.netrek.org/ >
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