Larry Martin | 13 May 22:39 2014

Re: What are the gotchas when updating Linaro kernels?

On 29Apr14 I wrote:

> Is there likely to be a conflict between my 3.14 kernel and the 3.5 filesystem image, or am I safe in assuming
I built things wrong and work on that?  I think the problem is probably in my build, but don't want to obsess
over that if somebody can tell me that it's bad to change the kernel that much (3.5 to 3.14) without also
changing X in the filesystem.

It turned out that it was bad to change that much.
+ I compiled 3.14.0+ uImage and modules,
+ successfully booted to a command line with the Linaro 3.5 file system,
+ ran ls -lR / overnight and declared victory,

but in actual use I got sync failures and other kernel panics, and had 
to go back to my 3.5.0+ kernel.

fwiw,
Larry

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Larry Martin | 13 May 22:55 2014

Is there an easy way to make a UBI image from a working MMC?

I have developed a solution in Linaro 3.5.0 on MMC, and now want to run 
from NAND.  ubiformat wants a built UBI image to write to NAND. How can 
I bridge that gap?

My project arc has been that I started with Linaro a year ago so I could 
compile modules on board.  Now I need to shoehorn the solution into NAND 
for production.  Starting with this image:

https://s3-us-west-2.amazonaws.com/linaro/GumstixLinaroROS_20130204_2.gz

By purging all the X windows and other visual stuff, and deleting ROS, I 
got a pretty small image, only 1.3 GB:

root <at> linaro-alip:~# df
Filesystem     1K-blocks    Used Available Use% Mounted on
/dev/mmcblk0p2   6493304 1305248   4858292  22% /
udev              246336       4    246332   1% /dev
tmpfs              99592     332     99260   1% /run
none                5120       0      5120   0% /run/lock
none              248972       0    248972   0% /run/shm

This page shows how to write my uImage to NAND, and that works great:

http://gumstix.org/software-development/how-to/70-writing-images-to-flash.html

but the instruction for rootfs assumes I have a built UBI image:
     ubiformat -y /dev/mtd4 -f omap3-desktop-nand-image-overo.ubi

I don't think I can reproduce my solution in Yocto or whatever without a 
lot of extra work.  How does one build a suitable UBI image from a 
(Continue reading)

Curtis Olson | 12 May 21:52 2014

flashing kernel/u-boot/rootfs/mlo to nand

I've run up against a problem here and have tried everything I can think of, but I can't manage to make my overo boot from onboard flash/nand and I'm hoping someone can't point out what I'm missing.

I have built a stock image from the yocto tree following the basic procedure outlined here and all the build steps completed successfully:


I am able to create a bootable microsd card following the basic procedure outlined here:


I am able to boot from the microsd built with the kernel, rootfs, u-boot, and MLO out of my build/tmp/deploy/images/overo/ directory.  So far everything seems good, except ...

Now I want to write my new (working) images to flash/nand and boot without the microsd card.

I followed the basic procedure outlined here:


But I get an immediate error with u-boot and it doesn't properly load/run.  I then hunted around and found an alternate set of instructions to write u-boot to nand:


After this u-boot is happy.  However when u-boot tries to load the kernel it spews a bunch of "Error: Bad compare! failed" messages and eventually gives up.  The Sakoman site also has similar instructions for installing the kernel, so I tried following those alternate instructions, but with no good result.

Does anyone have any idea what I'm missing here?  I'm not a complete novice and have successfully reflashed nand images last fall, but it seems like quite a bit has changed in the yocto tree and what I did before isn't working now.

This is an earlier overo, does that make a difference?  But it is booting fine with all the latest stuff as long as I boot from a microsd card. I just can't fine the magic to make this work in order to boot directly from flash/nand.

Thanks!

Curt.
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Michael | 12 May 15:22 2014
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Inherited a Verdex, but bricked.

So I inherited a bricked Verdex & JTAG.  I was hoping someone might 
guide me to un-bricking it or at least getting the JTAG functioning.  
I'm not certain the JTAG with it even works with the Verdex so that is a 
good place to start.

First of all I would like to just verify what I have.  Here are two 
images of what I believe to be gumstix Verdex.  From what I can tell it 
is a PXA270, 120-pin Molex & has no microSD.  (I think this means it is 
a Verdex and not a Verdex Pro).

http://tinypic.com/r/2vubsye/8
http://tinypic.com/r/s46yc4/8

Second, the JTAG that I'm less certain about.  There don't seem to be 
any non-dead links on the gumstix wiki.  Can anyone tell me a bit more 
about this JTAG?

http://tinypic.com/r/2yuhzjn/8
http://tinypic.com/r/11hs5lx/8

First, does this JTAG work with this Verdex board?
Second, is there any resource online for getting this Verdex + JTAG 
working together (assuming they can).

I have connected the pair together and spent some time with OpenOCD 
using the flyswatter interface and verdex configuration but haven't been 
successful.

Have I got all the hardware I need?  If I have perhaps I haven't 
connected them correctly?

I know the SOC is obsolete but I'm a hobbyist and wouldn't mind a hand.

Thanks much,

Michael

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dbrody | 10 May 22:17 2014

Unable to login when switching from sysvinit to systemd

I'm exploring some of the gumstix features just to learn a bit more about it. It looks like E-cons is using sysvinit for their build instead of systemd - psplash has the proper loading sequence. I also saw some recommendations on forums around using sysvinit over systemd. So I figured I would give it a shot and see what I can learn.

I changed my local.conf to have the following:

PREFERRED_PROVIDER_udev = "udev" DISTRO_FEATURES_append = " sysvinit pam" VIRTUAL-RUNTIME_init_manager = "sysvinit" I did the bitbake on the image and it built everything just fine.

The gumstix booted up to the login prompt but when I go to login with the root user, it fails to log in:
Poky (Yocto Project Reference Distro) 1.5.1 overo /dev/ttyO2 overo login: root Password: Module is unknown Poky (Yocto Project Reference Distro) 1.5.1 overo /dev/ttyO2 overo login: root Password: Last login: Sat May 10 13:24:20 Poky (Yocto Project Reference Distro) 1.5.1 overo /dev/ttyO2 overo login: root Password: Last login: Sat May 10 13:24:59 Poky (Yocto Project Reference Distro) 1.5.1 overo /dev/ttyO2 overo login: Attached is the bootup sequence output - failed_login.log

Any pointers would be helpful.
Thanks!
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Ashish Raste | 9 May 11:25 2014
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[ RTL8187 driver setup on Gumstix Overo ]

Hi all,

I've been trying get the rtl8187 driver working on my Gumstix Overo (3.5.7 kernel) image so that I can forgo the existing Marvell's wifi module.

I saw that rtl8187 driver's kernel module is already built along with the poky distribution and hence I edited the /etc/modules-load.d to have the rtl8187 loaded on boot.

When I connected the router (Alfa AWUS036H) directly to the Tobi board, I saw the kernel messages related to the rtl8187's properties and that its wireless switch is on.

But I haven't been able to see the router coming up physically (its small yellow-colored LED getting lit up) as it does when it is attached to the Ubuntu's kernel. The main differences that I observed were that the usb device was using xhci_hcd on Ubuntu while it was ehci-omap here, and the rate control algorithm being 'minstrel_ht' (on Ubuntu) and 'pid' here.  In short, I assume that the rtl8187 module is running fine.

I would like to know whether I'm missing anything here as the router has not opened up an interface on gumstix? Is it because we have to disable the libertas_sdio in order for the gumstix to recognize/invoke the Alfa router, or is it because I'm not connecting the router using a powered usb hub? Also I'd like to mention that connecting it through a usb hub threw errors such as:
khubd timed out on ep0in len=0/64

Thank you!


 



Thinking that



regards,
Ashish


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Abhishek Madaan | 8 May 05:37 2014
Picon

Tobi expansion board USB not working

Hi,

We just bought Overo Fire COM with Tobi expansion board. I am using Flash default image that came with overo. Everything works fine except USB host port. I can't even hook up keyboard or mouse. I also tried to use USB hub but nothing seems to be working. I looked online and see lot of people have the same issue with the tobi expansion board but couldn't find the solution related to this issue.

Is it possible that we got a bad Tobi board? Or Is something I need to do to turn the USB on?

Regards,
ABM
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Gaurav Chaturvedi | 7 May 15:40 2014

[Yocto over Overo/Beagleboard] "screen" utility not, working as expected

Hi,

I am using Yocto dylan 9.0.2 code to generate Ubuntu kernel and images 
for Overo/Beagleboard. Everything is working fine except the utility 
"screen" that I am using to ssh to board, running an application and 
logout.
This is what it is used for, but unfortunately it is not working that 
way. The application also exits once I logout from the board/terminate 
the ssh session.

I have tried different arguments of screen, but no use.
Can anyone please suggest some better ways of doing this.

Thanks in advance.

Cheers
Gaurav

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gotthardp | 6 May 23:12 2014
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Problems running Yocto image with Geppetto's 3-port USB Hub

Hello,
I have a Geppetto board with an (integrated) 3-port USB Hub. It works fine
with the default Linux shipped with the Overo COM (some older Angstrom with
kernel 2.6), however when I run the latest Yocto/Poky image (kernel 3.5.7) I
don't see any devices connected to any of the three ports. (I built a clean
Yocto image without any custom extensions.)

Do you have any hints what could be the root cause? Could the Yocto image
for Overo be missing some firmware / configuration for the Geppetto's 3-port
Hub?

Thanks a lot,
Petr

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dtran11 | 2 May 23:21 2014
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DuoVeroâ„¢ Zephyr Overheating

I am using a DuoVero Zephyr COM with wifi. I module would turn off if I try
to transfer a 10MB file over WIFI. I think it might be due to overheating.
The blue heatsink that came with the duovero is bigger than the POP chip
(extends into the wifi metal enclosure). 

Is the heatsink required? If not then I must be missing some throttling
module. If yes, then how are people putting the heatsink on when it is
bigger than the chip itself (can't get 100% of surface to be in contact with
heatsink).

Thanks

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krishna | 2 May 00:21 2014
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Wifi nok working for Overo board with official pre-built and compiled code.

Hi,

Wifi is not working on my Air Storm Overo Boards with the official image and
built image.

Has anybody NOT seen/worked-around this problem ? I am working on a clock
synchronization project and have to get it up soon.

I will be very grateful for any response.

Log  (during bootup): 
[FAILED] Failed to start network-wireless <at> wlan0.service

I have used the official images from here : 
http://gumstix.org/download-prebuilt-images.html

and also tested following the instructions here (used the master build): 
https://github.com/gumstix/Gumstix-YoctoProject-Repo
http://gumstix.org/software-development/how-to/252-bring-up-wifi-on-a-yocto-project-image.html

Linux version on laptop for yocto image build : Ubuntu 14_04
Poky (Yocto Project Reference Distro) 1.5.1 overo ttyO2

Thanks,
Krishna

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