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[openflow-discuss] PC Engine AP booting errors for OpenRoads

Masayoshi Kobayashi mkobaya1 at stanford.edu
Tue Mar 6 21:02:46 PST 2012


Hi Heming,

I've just finished updating the page. The boot issue can be independent 
of the image, so you may need to try KK's suggested solution too.

Let me know if you find any issue.

- Masa

On Mar 6, 2012, at 9:43 AM, Masayoshi Kobayashi wrote:
> Hi Heming,
> 
> Yes, the image SwanWifi.img is a bit old and I'd like to post a new one (and need to change
> the instruction). I'll do it sometime today.
> 
> - Masa
> 
> On Mar 6, 2012, at 7:51 AM, Heming Wen wrote:
>> Hi KK,
>> 
>> Thanks for the advice. I will try to find a ScanDisk CF (or a different brand CF) and see if that changes anything.
>> 
>> I noticed in the wiki for PC Engine AP that it was recently changed by Masa and is currently incomplete. Does that mean you have a new image for the AP?
>> 
>> The new instructions mention the file "OpenFlowAP.img.gz" which is named differently from the SwanWifi.img. The link to that file is not working yet but is there any difference in the new version beside the naming?
>> 
>> Thank you for your support,
>> 
>> Heming
>> ________________________________________
>> From: yapkke at gmail.com [yapkke at gmail.com] on behalf of kk yap [yapkke at stanford.edu]
>> Sent: March 3, 2012 20:01
>> To: Heming Wen
>> Cc: openflow-discuss at lists.stanford.edu
>> Subject: Re: [openflow-discuss] PC Engine AP booting errors for OpenRoads
>> 
>> Hi Heming,
>> 
>> Sorry for the late response.
>> 
>> The difference in size of the CF card should not make a difference,
>> esp. if you are using a larger card.  Expanding the filesystem to make
>> use of the 4GB space should be fairly simple too---a few commands with
>> fdisk which Google would remember better than I do.
>> 
>> As for the error, can I recommend that you try to use a SanDisk CF
>> card?  There is something about CF card and Grub's boot sector that
>> SanDisk seems to have got right.
>> 
>> http://lists.soekris.com/pipermail/soekris-tech/2008-October/015084.html
>> 
>> However, I cannot confirm that this is the problem, so just get one and try.
>> 
>> Regards
>> KK
>> 
>> On 27 February 2012 13:35, Heming Wen <heming.wen at mail.mcgill.ca> wrote:
>>> Greetings,
>>> 
>>> I am trying to run the image provided on the page: http://www.openflow.org/wk/index.php/OpenFlow_AP_with_PC_Engine
>>> Our lab has bought the same hardware as suggested by the tutorial. However, we are using 4GB Kingston compact flash drives instead of the 2GB one. After flashing the SwanWifi.img image on the CF card and trying to boot from it, I get the infamous GRUB Error 17 during bootloading.
>>> 
>>> I suspected whether the fact that I'm using 4GB CF card instead of 2GB makes a big difference. I also suspected whether the filesystem partitions has been properly installed or the disk properly formatted. When I use "fdisk -l" to peek into the content of the CF (through another PC with RHEL), I see four drive partitions, with a /boot/grub directory present on two of them. All the partitions types are "Linux". I tried playing around with the menu.lst and the device.map files but the error persists.
>>> 
>>> Also, is there any former steps that I have to do to flash the SwanWifi image into the CF card? I just assumed it was a regular image and used 'gunzip' and 'dd' commands to flash it. The tutorial site already assumes that the image is properly flashed on the CF card, which in this case I believe has failed.
>>> 
>>> Did anyone encounter similar issues before or have any good suggestions?
>>> 
>>> Thank you in advance for your support,
>>> 
>>> Heming Wen
>>> McGill University
>>> _______________________________________________
>>> openflow-discuss mailing list
>>> openflow-discuss at lists.stanford.edu
>>> https://mailman.stanford.edu/mailman/listinfo/openflow-discuss
>> _______________________________________________
>> openflow-discuss mailing list
>> openflow-discuss at lists.stanford.edu
>> https://mailman.stanford.edu/mailman/listinfo/openflow-discuss
> 
> - Masa
> 

- Masa



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