Mity CPU Platforms » MityDSP-L138 (ARM9 Based Platforms)

08/18/2014

04:31 PM PCB Development: RE: Protecting MityDSP module during development

Hi Udi,
Yes the FPGA I/Os can be damaged by sinking too much current - powered or off. The I/Os have protection d... Adam Dziedzic

03:39 PM PCB Development: Protecting MityDSP module during development

We just fried a MityDSP L138F module, and I'm not sure why. I'm suspecting that the problem was that we had an ADC mo... Udi Fuchs

08/11/2014

09:21 AM Software Development: RE: DSP HelloWorld Compile with gcc 4.3.3

tftp stalls when I set the block size larger than the standard MTU size (1500 - overhead = 1468). According to the so... Jonathan Cormier

09:06 AM Software Development: RE: DSP HelloWorld Compile with gcc 4.3.3

Glad that you got it working. I've never used the block size feature. I'll check out what affect it has on my tftp d... Jonathan Cormier

08/08/2014

03:20 PM Software Development: RE: DSP HelloWorld Compile with gcc 4.3.3

Successful tftp transfer of mityomap-full.jffs2 from VM to L138 ARM core! Tried setting the blocksize to 4096 in u-bo... Doug Browning

12:58 PM Software Development: RE: DSP HelloWorld Compile with gcc 4.3.3

Occasionally I see timeouts during the transfer but I haven't seen windows or the vm crash during a tftp transfer.
... Jonathan Cormier

10:52 AM Software Development: RE: DSP HelloWorld Compile with gcc 4.3.3

Thank you for the filesystem update procedures. I was able to successfully complete steps 1-5 (writing UBL_SPI_MEM.a... Doug Browning

08/07/2014

08:54 AM Software Development: RE: DSP HelloWorld Compile with gcc 4.3.3

I created a how to for updating an L138 devkit. Let me know if theres any confusing parts.
[[Updating devkit to lat... Jonathan Cormier

08/06/2014

02:37 PM Software Development: DSP HelloWorld Compile with gcc 4.3.3

I've recently completed the ARM HelloWorld example via the Starter Guide Wiki page and need help with the DSP HelloWo... Doug Browning

08/05/2014

09:30 AM Software Development: RE: How to enable PRU Subsystem on MityDSP-L138F SOM ???

Patches have been merged into linux-mityarm-v3.2 branch. Jonathan Cormier

09:16 AM Software Development: RE: I2C 0x8 Address

Cleaned up and merged changes into mitydsp-linux-v3.2 branch.
http://support.criticallink.com/gitweb/?p=linux-davi... Jonathan Cormier

08/04/2014

07:53 AM Software Development: RE: I2C 0x8 Address

Yes, works fine now. Thanks Jonathan.
Mostafa Afgani

08/01/2014

01:47 PM Software Development: RE: I2C 0x8 Address

I see now. Odd that i'm not encountering this lockup.
I moved the other cpufreq_notify and pushed it to the branch... Jonathan Cormier

11:16 AM Software Development: RE: I2C 0x8 Address

Yes, that only works when moving to a higher frequency because the voltage adjustments are made before the call to cp... Mostafa Afgani

11:12 AM Software Development: RE: I2C 0x8 Address

And thats why i moved the cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); to below that line as seen in your di... Jonathan Cormier

11:10 AM Software Development: RE: I2C 0x8 Address

Really don't know why we're seeing different things. I checked out both 'mitydsp-linux-v3.2' and 'mitydsp-linux-v3.2_... Mostafa Afgani

09:01 AM Software Development: RE: I2C 0x8 Address

I'm not seeing this hang with or without i2c-2 enabled. Jonathan Cormier

08:53 AM Software Development: RE: I2C 0x8 Address

Yes, v3.2_i2c_wip checked out and compiled as-is. Mostafa Afgani

08:32 AM Software Development: RE: I2C 0x8 Address

Are you saying you run into the hang when only i2c-1 is enabled? Jonathan Cormier

07/31/2014

03:36 PM Software Development: RE: Start Guide : Cannot build helloworld application with eclipse

Instructions for flashing a new filesystem can be found here:
https://support.criticallink.com/redmine/projects/arm9... Jonathan Cormier

11:57 AM Software Development: RE: Start Guide : Cannot build helloworld application with eclipse

After using the older toolchain v4.3.3 and existing ARM filesystem, I was able to get the HelloWorld executable to ru... Doug Browning

12:24 PM Software Development: RE: I2C 0x8 Address

I've just tried the latest mitydsp-linux-v3.2 from git (without the i2c patches) and that works fine. Mostafa Afgani

11:04 AM Software Development: RE: I2C 0x8 Address

Just for clarification, I had reverted all changes to the branch (enabling i2c-2) so 'git status' shows no local modi... Mostafa Afgani

10:41 AM Software Development: RE: I2C 0x8 Address

Yes, it is:... Mostafa Afgani

10:07 AM Software Development: RE: I2C 0x8 Address

Just to verify this was with the newer mitydsp-linux-v3.2_i2c_wip branch? Jonathan Cormier

09:55 AM Software Development: RE: I2C 0x8 Address

That's really strange. The only modifications I made were to baseboard-industrialio.c in order to enable i2c-2:
<p... Mostafa Afgani

08:24 AM Software Development: RE: I2C 0x8 Address

I tried your steps on the mitydsp-linux-v3.2_i2c_wip with i2c-2 enabled but didn't encounter a hang. Jonathan Cormier

07/30/2014

01:33 PM Software Development: RE: Start Guide : Cannot build helloworld application with eclipse

> root@mityomapl138:/var/volatile/tmp# ./HelloWorldCC
> ./HelloWorldCC: /usr/lib/libstdc++.so.6: version `CXXABI_ARM... Jonathan Cormier

12:48 PM Software Development: RE: Start Guide : Cannot build helloworld application with eclipse

Jonathan,
Thanks for the reply.
Yes, I’ve followed the Starter Guide. Spent most of last week working through it.... Doug Browning

08:18 AM Software Development: RE: I2C 0x8 Address

Hi Jonathan, thanks for the testing branch. As our code is still based around the old 2.6.34-rc1 release, it will be ... Mostafa Afgani

07/29/2014

02:25 PM Software Development: RE: I2C 0x8 Address

I've created a test branch with my patches for this problem. Could you verify it works for you? Note that branch wo... Jonathan Cormier

10:24 AM Software Development: RE: I2C 0x8 Address

Okay I have submitted a bug report to the linux davinci mailing list using some of your procedures and stack trace. ... Jonathan Cormier

10:12 AM Software Development: RE: I2C 0x8 Address

Thanks Jonathan, I can confirm that the workaround allows the CPU frequency scaling to work with I2C1 enabled (but no... Mostafa Afgani

09:56 AM Software Development: RE: I2C 0x8 Address

It appears that the wait_for_completion is the wrong type of synchronization as it currently will always be true as l... Jonathan Cormier

08:56 AM Software Development: RE: I2C 0x8 Address

The transition function looks like following. The wait_for_completion call then calls wait_for_common which can be s... Jonathan Cormier

08:50 AM Software Development: RE: I2C 0x8 Address

I can confirm. Made the following changes to the 3.2 kernel and tried changing the frequency. It locks up if you do... Jonathan Cormier

08:33 AM Software Development: RE: I2C 0x8 Address

Hi Mike,
??To confirm, you don't see this issue with I2C1 not enabled in you kernel (the "stock" dev kit kernel), ... Mostafa Afgani

07:42 AM Software Development: RE: I2C 0x8 Address

Ok, you didn't mention you are trying to adjust the CPU speed (or I missed it) as your I2C0 access method. That's no... Michael Williamson

05:44 AM Software Development: RE: I2C 0x8 Address

Hi Mike, actually our experience is the opposite:
1. Enable I2C1, flash the new kernel and reboot
2. Immediately ... Mostafa Afgani

09:09 AM Software Development: RE: Start Guide : Cannot build helloworld application with eclipse

Have you followed the instructions located on the wiki? https://support.criticallink.com/redmine/projects/arm9-platf... Jonathan Cormier

07/28/2014

03:13 PM Software Development: RE: Start Guide : Cannot build helloworld application with eclipse

I'm working through the Starter Guide for the MityDSP-L138 configured with
- VirtualBox 4.3.0 (could not get Mity... Doug Browning

11:55 AM Software Development: RE: I2C 0x8 Address

Looks like the kernel is configuring the OMAP-L138 I2C slave address as 0x08 (by default, it is 0x00 - illegal - in t... Michael Williamson

11:33 AM Software Development: RE: I2C 0x8 Address

No worries. I don't think i2c-detect does anything strange with this address. By looking at the code, I don't see any... Angelos Spanos

11:29 AM Software Development: RE: I2C 0x8 Address

We're looking at it now. I think that the i2c-tools may be emulating SMBus and trying to run the arbitration scheme ... Michael Williamson

10:49 AM Software Development: RE: I2C 0x8 Address

Source : System Management Bus (SMBus) Specification Version 2.0 August 3, 2000 :Appendix C – SMBus device address as... Angelos Spanos

10:20 AM Software Development: RE: I2C 0x8 Address

OK. So is it a defect on the MityDSP-L138F board, or is it the address of the OMAP I2C bus? Angelos Spanos

09:54 AM Software Development: RE: I2C 0x8 Address

Also on a devkit where the dvi chip was removed the 0x08 address still appears.... Jonathan Cormier

09:52 AM Software Development: RE: I2C 0x8 Address

Well at the least I can identify the others. 0x38 is the dvi chip, 0x48 is the pmic, and 0x50-58 is the eeprom. Whe... Jonathan Cormier

09:31 AM Software Development: RE: I2C 0x8 Address

We use a custom baseboard, but the address 0x8 is at the the industrial IO development kit as well:
root@PureVLC:~... Angelos Spanos

08:06 AM Software Development: RE: I2C 0x8 Address

Did you set the pin-mux settings for the I2C1 lines on the second device in the kernel as well? For the devkit baseb... Michael Williamson

07:59 AM Software Development: RE: I2C 0x8 Address

The problem is that if we enable both I2C interfaces by changing the linux source code by adding the following lines ... Angelos Spanos

07:55 AM Software Development: RE: I2C 0x8 Address

What are you using for your baseboard? Michael Williamson

07:46 AM Software Development: RE: I2C 0x8 Address

I am using MityDSP-L138F board. Angelos Spanos

07:44 AM Software Development: I2C 0x8 Address

Hi All,
When I run i2cdetect -y 1 I get the following output:
0 1 2 3 4 5 6 7 8 9 a b c d e ... Angelos Spanos

07/23/2014

11:06 PM FPGA Development: RE: fpgautil read Issue

Hi Mike,
I found the issue. I was updating the edo_out signals only when rd was going high.
From the waveform... pari subramaniam

08:42 PM FPGA Development: RE: fpgautil read Issue

Can you post (or email me) you VHDL source related to the loopback register?
Do you have Chipscope? It might be w... Michael Williamson

08:22 PM FPGA Development: fpgautil read Issue

I'm using MityDSP-L138 Board. I have implemented a Custom IP in the FPGA board.
I'm using the CS5 ARM Chipselect ... pari subramaniam

07/22/2014

11:42 AM Software Development: RE: uPP receiving problem

Hello Silvano,
No, the MDK uPP libraries are not setup to work with the debugger. In your code you can try settin... Gregory Gluszek

08:54 AM Software Development: RE: uPP receiving problem

The strange behaviour still continue.
When we do not send data to uPP using the FPGA the program does not have the s... Silvano Bertoldo

03:10 AM Software Development: RE: uPP receiving problem

Thanks a lot for the suggestion.
I will check with my colleague the VHDL connection.
I also had a check at the opti... Silvano Bertoldo

07/21/2014

12:41 PM Software Development: RE: uPP receiving problem

The strange stepping sounds exactly like when optimizations are turned on. Jonathan Cormier

11:46 AM Software Development: RE: uPP receiving problem

I'm not a VHDL guy, so I can't say whether this will work as you have it. It sounds like you and your VHDL guy shoul... David Rice

11:34 AM Software Development: RE: uPP receiving problem

Here you can find the VHDL sources.
I cannot help you a lot with VHDL becuse it is developed by a colleague of mine.... Silvano Bertoldo

11:19 AM Software Development: RE: uPP receiving problem

Thanks a lot.
Now the working principles are clearer.
The problem now is that the software has a strange behaviour.... Silvano Bertoldo

11:09 AM Software Development: RE: uPP receiving problem

Each time you call receive, a DMA is set up to fill the buffer you pass. Once that DMA completes, no data will be tr... David Rice

10:08 AM Software Development: RE: uPP receiving problem

Ok thank you.
I will try to change all the interrupt levels.
Another question is: but once the buffer is filled? Wh... Silvano Bertoldo

10:05 AM Software Development: RE: uPP receiving problem

I don't see any reason that it wouldn't work, but I have seen issues with some interrupt levels not working. I stron... David Rice

09:59 AM Software Development: RE: uPP receiving problem

Thanks to have a look.
I have the signal enable and start always active.
I think that therefore is right to set bCh... Silvano Bertoldo

09:49 AM Software Development: RE: uPP receiving problem

A couple of things that I see are different from some code that I have working here:
I use nHWInterruptLevel = 7. ... David Rice

09:05 AM Software Development: uPP receiving problem

Dear all,
I am trying to use to uPP to receive data coming from the FPGA.
Attached you can find the code I wrot... Silvano Bertoldo