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user: Add documentation for NOEL-V BSP

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@ -261,6 +261,63 @@ Serial terminal UART1 displays the SMP example messages
*** END OF TEST SMP 1 ***
noel
====
This BSP supports the `NOEL-V <https://gaisler.com/noel-v>`_ systems from Cobham
Gaisler. The NOEL-V is a synthesizable VHDL model of a processor that
implements the RISC-V architecture. It is part of the open source
`GRLIB <https://gaisler.com/grlib>`_ IP Library. The following BSP
variants correspond to common NOEL-V configurations:
* noel32im
* noel32imafd
* noel64imac
* noel64imafd
* noel64imafdc
The start of the memory is set to 0x0 to match a standard NOEL-V system,
but can be changed using the ``RISCV_RAM_REGION_BEGIN`` configuration
option. The size of the memory is taken from the information available
in the device tree.
Reference Designs
-----------------
The BSP has been tested with NOEL-V reference designs for
`Digilent Arty A7 <https://gaisler.com/noel-artya7>`_,
`Microchip PolarFire Splash Kit <https://gaisler.com/noel-pf>`_,
and `Xilinx KCU105 <https://gaisler.com/noel-xcku>`_.
See the accompanying quickstart guide for each reference design
to determine which BSP configuration to use.
Build Configuration Options
---------------------------
The following options can be used in the BSP section of the ``waf``
configuration INI file. The ``waf`` defaults can be used to inspect the values.
``BSP_CONSOLE_USE_INTERRUPTS``
Use the Termios interrupt mode in the console driver (true by default).
``BSP_FDT_BLOB_SIZE_MAX``
The maximum size of the device tree blob in bytes (262144 by default).
``RISCV_CONSOLE_MAX_APBUART_DEVICES``
The maximum number of APBUART devices supported by the console driver
(2 by default).
``RISCV_RAM_REGION_BEGIN``
The begin of the RAM region for linker command file (0x0 by default).
``RISCV_MAXIMUM_EXTERNAL_INTERRUPTS``
The maximum number of external interrupts supported by the BSP (64 by
default).
griscv
======