Mity CPU Platforms » MitySOM-5CSX Altera Cyclone V

04/15/2017

JK 02:41 PM Software Development: RE: SPI Comm - can transmit data from Linux, but not receive

For completeness:
I think the reason U-boot wouldn't boot the device tree I attached for you is because it's too large for the ubootenv.bin you are using.
In uBootMMCEnv.txt (used to generate ubootenv.bin), loadkerneladdr needs to ... Jared Kirschner

04/14/2017

DV 06:01 PM Software Development: RE: SPI Comm - can transmit data from Linux, but not receive

That's awesome to hear! Sorry for the bit of delay, I was working on packaging up my old build to send out to you guys.
Glad to hear you got it working.
Dan Daniel Vincelette

JK 05:57 PM Software Development: RE: SPI Comm - can transmit data from Linux, but not receive

Update:
We got loopback working (so no longer need the FPGA project to compare with).
After regenerating our preloader, the loopback behavior changed, in that the operation hung rather than returning with an empty receive buffer.
... Jared Kirschner

JK 05:04 PM Software Development: RE: SPI Comm - can transmit data from Linux, but not receive

Edit: I see the device tree source above, so the FPGA project is the only information we'd need. Jared Kirschner

JK 04:08 PM Software Development: RE: SPI Comm - can transmit data from Linux, but not receive

Hello Dan,
I'm back from vacation and looking into this again with my hardware engineer colleague. Our first attempt at regenerating the preloader based on our current FPGA image didn't result in working loopback communication, so we'... Jared Kirschner