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

Heming Wen heming.wen at
Wed Mar 7 16:18:28 PST 2012

Good evening KK,

I have a question concerning the CF cards again. Do you usually use the SanDisk Original CF cards or the SanDisk Ultra CF cards? I ask this because the original CF cards are very old product and extremely hard to find.

Thank you for your help,

From: yapkke at [yapkke at] on behalf of kk yap [yapkke at]
Sent: March 3, 2012 20:01
To: Heming Wen
Cc: openflow-discuss at
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.

However, I cannot confirm that this is the problem, so just get one and try.


On 27 February 2012 13:35, Heming Wen <heming.wen at> wrote:
> Greetings,
> I am trying to run the image provided on the page:
> 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 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

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