Activity
From 04/17/2017 to 05/16/2017
05/15/2017
- BW 12:23 PM Software Development: RE: Altera spi
- Dan,
Sorry for the delay. I've been out of town. Here is the c file that I was using to test the spi.
Thanks,
Brian
05/10/2017
- DV 03:27 PM Software Development: RE: Altera spi
- Brian,
Would you mind posting your updated spi_test.c? I'll see if I can recreate what you're seeing on my dev kit.
Thanks,
Dan
05/09/2017
- BW 06:46 PM Software Development: RE: Altera spi
- Thanks Dan,
This cleared up the errors on the DTB. I have tried to run the spi_test.c provided in a different post and still get the Unable to handle kernel NULL pointer dereference at virtual address 00000000. I'm not sure if it's a pr...
05/08/2017
- DV 06:18 PM Software Development: RE: Altera spi
- Hi Brian,
Sorry you'll also have to set #size-cells to 0x0 for the altera spi driver nodes, this info was taken from here: https://support.criticallink.com/gitweb/?p=linux-socfpga.git;a=blob;f=Documentation/devicetree/bindings/spi/spi... - BW 05:11 PM Software Development: RE: Altera spi
- I'm still getting the same error.
- DV 04:57 PM Software Development: RE: Altera spi
- Hi Brain,
Sorry for the delay. Looking at the warnings you're getting from the critical link toolchain you need to set the #address-cells to 1.
For example: - BW 01:24 PM Software Development: RE: Altera spi
- I was able to comply the DTB using a tool chain from rocketboards and a spi device showed up under /dev/spidev. Writing to this device crashes Linux and gives me the following error:
Unable to handle kernel NULL pointer dereference at v...
05/02/2017
- BW 07:59 PM Software Development: RE: Altera spi
- Thanks for the reply. I have updated the dts and I'm getting the following warnings:
Warning (reg_format): "reg" property in /soc/bus@0ff200000/spi@0x0060/device@0 has invalid length (4 bytes) (#address-cells == 2, #size-cells == 0)
... - MW 02:54 PM Software Development: RE: Altera spi
- Hi Brian,
Are you trying to use the device from user space with the spidev driver? If so, then you need to fix the device tree to use:
05/01/2017
- I am trying to use an altera spi as a master. I have enabled the driver in the kernel and added the device to the DTB. No spi devices show up under /dev. I have been looking into using to the sysfs interface but I'm not sure if this is t...