Activity

From 03/22/2016 to 04/20/2016

01:48 PM Software Development: RE: High latency for DMTimer interrupt: Mary, Thank you for this detailed post. Please let us know how this works out. Jonathan Cormier
01:44 PM Software Development: RE: High latency for DMTimer interrupt: Here's what I did to apply the RT PREEMPT patch:
Helpful websites:
https://rt.wiki.kernel.org/index.php/RT_PREEMP... Mary Frantz

10:06 AM Software Development: RE: High latency for DMTimer interrupt: Note that the RT linux page also has an Ftrace guide: https://rt.wiki.kernel.org/index.php/Ftrace Jonathan Cormier
09:53 AM Software Development: RE: High latency for DMTimer interrupt: Hi Mary,
Regarding RT Linux I would specifically recommend https://rt.wiki.kernel.org/index.php/RT_PREEMPT_HOWTO ... Gregory Gluszek

11:43 PM Software Development: RE: High latency for DMTimer interrupt: Mary,
Here is a link to the RT Linux Wiki:
https://rt.wiki.kernel.org/index.php/Main_Page
There's a direct lin... Bob Duke
03:35 PM Software Development: RE: All devices on i2c on the AM335 SOM: I created a wiki page for this information. Let me know if it answers your question.
[[MitySOM-335x_I2C_Addresses]] Jonathan Cormier

02:30 PM Software Development: All devices on i2c on the AM335 SOM: Hello,
I am writing some diagnostic software for our device to run through and make sure everything seems to be pr... Joseph Orender
11:09 AM Software Development: RE: High latency for DMTimer interrupt: Mary Frantz wrote:
> For more information about how the DM Timer works, refer the the AM335x Technical Reference Man... Jonathan Cormier
10:59 AM Software Development: RE: High latency for DMTimer interrupt: For more information about how the DM Timer works, refer the the AM335x Technical Reference Manual.
To summarize, ... Mary Frantz
10:09 AM Software Development: RE: High latency for DMTimer interrupt: Mary Frantz wrote:
> This code:
>
> [...]
>
> prints the value of 'start' (the counter value at the start of t... Jonathan Cormier
09:48 AM Software Development: RE: High latency for DMTimer interrupt: This code:... Mary Frantz
09:28 AM Software Development: RE: High latency for DMTimer interrupt: Mary Frantz wrote:
> I see this when the printk() call displays the last 16 'start' counter values.
What do you mea... Jonathan Cormier
08:58 AM Software Development: RE: High latency for DMTimer interrupt: No, this high latency is rare. Typical is more like 3 usec. I see this when the printk() call displays the last 16 ... Mary Frantz

02:25 PM Software Development: RE: High latency for DMTimer interrupt: Hi Mary,
You mentioned that your maximum latency is ~500 usec. Is this maximum a rare or common occurrence? What ... Gregory Gluszek
02:02 PM Software Development: High latency for DMTimer interrupt: I have implemented a timer interrupt in a kernel module. At the start of the isr, it reads the timer value which sho... Mary Frantz

04:24 PM Software Development: RE: Building an SD Card: Tom Tatakis wrote:
> This is a custom board- I did move the init of mmc back to the early init stage as a test and t... Jonathan Cormier
04:21 PM Software Development: RE: Building an SD Card: Tom,
We are working on a yocto filesystem release which allows you to build a new yocto based filesystem from sour... Jonathan Cormier
03:52 PM Software Development: RE: Building an SD Card: Actually I do have a question- do you have a pointer to documentation that tells me how to build an SD card image fro... Tom Tatakis
03:50 PM Software Development: RE: Building an SD Card: This is a custom board- I did move the init of mmc back to the early init stage as a test and the file system came up... Tom Tatakis
02:08 PM Software Development: RE: Building an SD Card: Tom, one more question: are you running this on a Critical Link Development Board or your own custom baseboard?
Bob Duke

09:57 AM Software Development: RE: Building an SD Card: Looking at the logs here are a few things I see.
* On the sd card boots, you are still loading u-boot from the nan... Jonathan Cormier
09:02 AM Software Development: RE: Building an SD Card: Thanks for the reply- of course now the symptoms have changed. The bad boot now stops waiting for the file system pa... Tom Tatakis

02:36 PM Software Development: RE: Building an SD Card: Actually 3 logs. The two sd card boot logs and the nand boot log with the new kernel. Jonathan Cormier
02:34 PM Software Development: RE: Building an SD Card: Tom,
Could you include the full boot log of the working and the broken boots? Jonathan Cormier
12:32 PM Software Development: Building an SD Card: Hello- First, I have a working SD card that boots that I have been using for over a year. I also have a newer kernel... Tom Tatakis

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