bitbake SRC_URI checksum warnings

I am trying to setup a meta-layer to support some overo-based custom
hardware. I am trying to migrate recipes from the oe-classic build system to
the newer poky and oe-core. To get started I just wanted to make some simple
patched builds before attempting to convert the more complex recipes.
Basically the error I keep getting looks something like this:

WARNING: Unable to get checksum for linux-gumstix-mods SRC_URI entry
defconfig: file could not be found
WARNING: Unable to get checksum for linux-gumstix-mods SRC_URI entry
abc.patch: file could not be found
WARNING: Unable to get checksum for linux-gumstix-mods SRC_URI entry
xyz.patch: file could not be found

and etc...

The recipes are pretty straightforward. Basically just expanding a shell
like below
---------------------------------------------------------

require linux.inc

DESCRIPTION = "Linux kernel for OMAP processors"
KERNEL_IMAGETYPE = "uImage"

PV = "3.5"

S = "${WORKDIR}/git"

COMPATIBLE_MACHINE = "overo"

Error adding Jack recipe to overo image

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I2C problem when using IMU.py on RoboVero

This post was updated on May 16, 2013; 10:26am.
Hello all, 

I am using a RoboVero board mounted on Overo. I tried to talk to the boards
using the example Python scripts. 

When I run IMU.py, the command line just hang there and I cannot even kill
the program. On the RoboVero board, the LED heartbeat stop flashing once I
run the script. To restore control, I need to restart the RoboVero board and
the connection. 

After a closer look into IMU.py, I found that problem is caused by this
function: 
I2C_MasterTransferData() 

which is called when the program wants to write/read register values
(writeReg/readReg). Since accessing the sensors (accelerometer, compass,
gyro) needs to go through this procedure, the program halts. 

I tried connecting through USB and SSH. For adc.py, callback.py and DSP.py,
they work as expected (turning the LED on/off by pushing button, reading adc
values, etc). I believe I have configured the boards correctly, but there
should be some issues within the I2C routine. 

Can anyone shed a light on the problem? Does anyone experience similar
problem? How can I look into the I2C problem? 
Any help would be appreciated. 

Many thanks, 
Thomas

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Re: I2C problem when using IMU.py on RoboVero

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BogoMIPS not recalculated in yocto 3.5 stable after MPU_RATE change?

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serial data stream

Hello,

I'm looking for a way to transmit and/or receive a continuous stream
of digital, serial data using my Overo Fire COM on a Summit expansion
board. I'm relatively new to the whole embedded stuff, so I'm not sure
how to best go about this.

I'm experimenting with various devices like video game console
controllers and RGB LED strips, which use serial data communication,
but don't adhere to any commonly used protocol like 8n1 UART, SPI or
I2C. So I find myself in need to be able to transmit and receive
arbitrary streams of serial data with clocks of around 1 MHz. A
concrete example would be sending a raw bitstream of 2400 bits to some
device at 800 kHz, with the data line being set to low before and
after the transfer, and no pauses during the transfer.

I've been looking into SPI and from what the OMAP35x reference manual
says in the section about Single-Channel Master Mode (19.5.2.5) it
seems like I may be able to abuse the SPI interface to transmit
arbitrary serial data streams without having pauses between the
individual data words, but I'm not entirely sure, maybe I'm not
interpreting it correctly. From what I've read in the section about
the McBSP module, it wouldn't work since there may be pauses between
the data frames. Another possibility may be using the GPIO ports
directly (simply switching them on and off with the right timing to
send my data), but I don't know what kind of transfer rates I can get
on GPIO, or whether that is a good idea at all, with the scheduler and
interrupts getting in my way. Using the UARTs is out of the question
since these are way too slow from what I've seen in my experiment, in
addition to forcing me to send start and stop bits.

So, I'm not sure which approach is the easiest/best and I've been
thinking that what I'm trying to do here can't be all that special, so
I'm hoping that there is somehow a more straightforward way of doing
this, which doesn't involve low-level programming of the SPI interface
or bitbanging on the GPIO pins while fighting the process scheduler
and the interrupts. So any pointers on how to approach this problem
would be very helpful.

Thanks in advance,
 Julian

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Small typo on board schematics

Tobi schematic

http://pubs.gumstix.com/boards/TOBI/PCB30002-R3564/PCB30002.pdf

Connector J4, pin 39

It's labeled as GPIO20_MMC3_D2 inside the box and GPIO18_MMC3_D2 outside.
GPIO20 is the correct value.

PCB30002-R3474 and PCB30002-R3493 have the same error.

So does the Summit schematic

http://pubs.gumstix.com/boards/SUMMIT/PCB30001-R2734/PCB30001.pdf

That's all I checked.

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Thin client

Hi,

Anyone have experience with gumstix as Linux thin clients using xrdp and Ubuntu server. Does sound/video
work well, any known issues?

Thanks 

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path of least resistance? (which OS to use?)

I'm new to Gumstix but I've been reading a lot of old mailing list
discussions and poking around the wiki, as well as Yocto, Angstrom,
Linaro, etc.

At this point I'm rather confused and frustrated.  I feel like I've
been wasting a lot of time.  The information available online often
seems outdated or contradictory.  And I've spend hours burning SD card
images and trying to get a useful setup.

What I'd like to do is get a working SD card image that I can run on a
several different Overo units (Water, Fire, Earth) with Tobi boards.
I'm looking for a a distro that has integrated package management,
semi-modern kernel, and a decent selection of packages available
(rsync, perl, etc--nothing exotic).  I'm really NOT interested in
cross-compiling if I don't NEED to.

It seems that Angstrom works but is old and Gumstix isn't updating it anymore.

Linaro seems like a way forward (I know Ubuntu well) but I've
experienced a number of kernel panics and filesystem corruption so far
by going that route.

The Yocto images from Gumstix seem to work but there's no package
management, no compiler (gcc), and I'm having trouble understanding
why (and how anyone gets anything done starting from there).  And
building my own Yocto image appears to be a maze of twisty paths,
mostly not documented well.

Can anyone give me suggestions/pointers on a way forward?

Am I just spoiled, having spent 10+ years in the Debian ecosystem?  I
can't help but feel like what's currently available for Gumstix is
very Do It Yourself.

How do most people do this?

Thanks,

Jeremy

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