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

10/24/2014

MW 10:41 AM PCB Development: RE: L138 SOM LEDs

Sorry,
On Non-FPGA modules:
D1 is connected to R16 (GP6_12) of the OMAP-L138.
D2 is connected to R17 (GP6_13) of the OMAP-L138.
-Mike
Michael Williamson

AK 10:05 AM PCB Development: RE: L138 SOM LEDs

Hi Mike,
The SOM we are using is the non-FPGA version. What do D1 and D2 connect to?
Thanks,
Anton Anton Kitai

MW 07:22 AM PCB Development: RE: L138 SOM LEDs

D1 is connected to the FPGA_DONE pin on the FPGA configuration block.
D2 is connected to P15 of the FPGA IO_L74P_AWAKE_1
D3 is connected to P16 of the FPGA IO_L74N_DOUT_BUSY_1
-Mike
Michael Williamson

AK 10:03 AM PCB Development: RE: MityDSP-L138 Boot Problem

This issue has been resolved - we had left an uterminated SPI1_CLK signal trace on our base board at an unpopulated device.
Anton Anton Kitai

10/22/2014

AK 03:13 PM PCB Development: L138 SOM LEDs

Please can you provide information for D1 and D2 LEDs on the L138-FX-225-RC module. What are they connected to?
Thanks,
Anton Anton Kitai

AK 02:05 PM PCB Development: MityDSP-L138 Boot Problem

We are using the L138-FX-225-RC on a new custom baseboard and are having trouble with boot:
- no UART activity in normal SPI boot
- UART boot mode sends "BOOTME"
We attempted to erase and flash the bootloader using the WinCE boot pa... Anton Kitai

09/26/2014

MA 02:27 AM Software Development: RE: GP0[4] state on boot for L138F

??How quickly do you need it to be low? You might put an external pull down on your board.??
Pretty much instantly would be ideal as we use it as a /SHUTDOWN control for some hardware that should only be brought up once the Mity is fu... Mostafa Afgani

09/25/2014

MW 07:46 PM Software Development: RE: GP0[4] state on boot for L138F

How quickly do you need it to be low? You might put an external pull down on your board.
You could disable the pull up, but keep in mind the OMAP-L138 controls for the pull up are in groups, so you will affect other pins when you dis... Michael Williamson

MA 05:11 PM Software Development: RE: GP0[4] state on boot for L138F

Hi Mike, thanks for the explanation. As we need this pin to be low on power-up, would the best place to set this be in the U-Boot mityomap config/init code? Mostafa Afgani

MW 03:40 PM Software Development: RE: GP0[4] state on boot for L138F

Hi,
If you check the OMAP-L138 datasheet (it's a bit convolved) Table 2-29, the GP0[4] pin pullup state is defined by CP[2] group control in the PUPDENA / PUPDSEL registers after reset completes (during reset it should be pulled down)... Michael Williamson

MA 03:28 PM Software Development: GP0[4] state on boot for L138F

Hi, we noticed that the power on state of GPIO_0_4 is that it is driven high. I am a little confused about this since I can't see anything in the U-Boot source code (u-boot-mitydspl138/board/davinci/mityomapl138/) changing PINMUX1 from t... Mostafa Afgani