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.. SPDX-License-Identifier: CC-BY-SA-4.0
.. Copyright (C) 2017, 2019 embedded brains GmbH
.. Copyright (C) 2017, 2019 Sebastian Huber
altera-cyclone-v (Intel Cyclone V)
==================================
This BSP offers only one variant, the `altcycv_devkit`. This variant supports
the Intel Cyclone V system on chip. The basic hardware initialization is not
performed by the BSP. A boot loader with device tree support must be used to
start the BSP, e.g. U-Boot.
The BSP is known to run on these boards:
* `Cyclone V SoC Development Kit <https://www.intel.com/content/www/us/en/programmable/products/boards_and_kits/dev-kits/altera/kit-cyclone-v-soc.html>`_
* `Enclustra Mars MA3 SoC Module <https://www.enclustra.com/en/products/system-on-chip-modules/mars-ma3/>`_
* `Terasic DE10-Standard Development Kit <https://www.terasic.com.tw/cgi-bin/page/archive.pl?Language=English&CategoryNo=165&No=1081>`_
Boot via U-Boot
---------------
The application executable file (ELF file) must be converted to an U-Boot
image. Use the following commands:
.. code-block:: none
arm-rtems5-objcopy -O binary app.exe app.bin
gzip -9 -f -c app.bin > app.bin.gz
mkimage -A arm -O linux -T kernel -a 0x00300000 -e 0x00300000 -n RTEMS -d app.bin.gz app.img
Use the following U-Boot commands to boot an application via TFTP download:
.. code-block:: none
tftpboot ${loadaddr} app.img && run loadfdt && bootm ${loadaddr} - ${fdt_addr} ; reset
The ``loadfdt`` command may be not defined in your U-Boot environment. Just
replace it with the appropriate commands to load the device tree at
``${fdt_addr}``.
Clock Driver
------------
The clock driver uses the `Cortex-A9 MPCore Global Timer`.
Console Driver
--------------
The console driver supports up to two on-chip NS16550 UARTs. The console
driver does not configure the pins.
I2C Driver
----------
There is a legacy I2C driver. It should be converted to the I2C driver framework.
Network Interface Driver
------------------------
The network interface driver is provided by the `libbsd`. It is initialized
according to the device tree. It supports checksum offload.
MMC/SDCard Driver
-----------------
The MMC/SDCard driver is provided by the `libbsd`. It is
initialized according to the device tree. Pin re-configuration according to
the serial clock frequency is not supported. DMA transfers are supported.
USB Host Driver
---------------
The USB host driver is provided by the `libbsd`. It is initialized according
to the device tree. The driver works in polled mode.
Caveats
-------
The clock and pin configuration support is quite rudimentary and mostly relies
on the boot loader.
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