user: Add basic Intel Cyclone V documentation

user/bsps/bsps-arm.rst

@@ -1,6 +1,7 @@
 .. SPDX-License-Identifier: CC-BY-SA-4.0
 
-.. Copyright (C) 2017, 2018 embedded brains GmbH
+.. Copyright (C) 2017, 2019 embedded brains GmbH
+.. Copyright (C) 2017, 2019 Sebastian Huber
 
 arm (ARM)
 *********
@@ -8,7 +9,77 @@ arm (ARM)
 altera-cyclone-v
 ================
 
-TODO.
+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:
+
+::
+
+    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:
+
+::
+
+    tftpboot ${loadaddr} app.img && run loadfdt && bootm ${loadaddr} - ${fdt_addr} ; reset
+
+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.
 
 atsam
 =====