device-tree example for altera-cyclone-v bsp

[Sebastian Huber]

Hello Christian,

I added some basic BSP documentation:

https://docs.rtems.org/branches/master/user/bsps/bsps-arm.html#altera-cyclone-v

On 14/02/2019 13:54, Christian Spindeldreier wrote:
>
> we had to change the BSP_ARM_A9MPCORE_PERIPHCLK frequency to 100 MHz 
> as this is the frequency the L4 MP clock is set by Qsys or the SPL, 
> respectively. This meant adding a second board to the altera-cyclone-v 
> bsp differing only by this configuration option. Adapting the 
> configuration as described enabled the upstream RTEMS-5 version to 
> boot on the Terasic-DE10 Standard Board 
> (http://de10-standard.terasic.com).

I changed the BSP initialization to use the device tree for this clock:

https://git.rtems.org/rtems/commit/?id=af80b0a3406bef73dc6550421947a981c939da27

It would be nice if you could test this. Please remove the 
"BSP_ARM_A9MPCORE_PERIPHCLK=100000000" from the configure command line.

>
> U-Boot itself contains a device-tree of the board it is running on, 
> but i missed the u-boot command handing over the u-boot device-tree to 
> rtems which expects the device-tree address in R6 on startup. If there 
> is anything like this i am pleased on any information on it.

The device tree provided by U-Boot is in r2.

-- 
Sebastian Huber, embedded brains GmbH

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