Nuvoton iBMC boards (``npcm750-evb``, ``quanta-gsj``)
=====================================================

The `Nuvoton iBMC`_ chips (NPCM7xx) are a family of ARM-based SoCs that are
designed to be used as Baseboard Management Controllers (BMCs) in various
servers. They all feature one or two ARM Cortex A9 CPU cores, as well as an
assortment of peripherals targeted for either Enterprise or Data Center /
Hyperscale applications. The former is a superset of the latter, so NPCM750 has
all the peripherals of NPCM730 and more.

.. _Nuvoton iBMC: https://www.nuvoton.com/products/cloud-computing/ibmc/

The NPCM750 SoC has two Cortex A9 cores and is targeted for the Enterprise
segment. The following machines are based on this chip :

- ``npcm750-evb``       Nuvoton NPCM750 Evaluation board

The NPCM730 SoC has two Cortex A9 cores and is targeted for Data Center and
Hyperscale applications. The following machines are based on this chip :

- ``quanta-gsj``        Quanta GSJ server BMC

There are also two more SoCs, NPCM710 and NPCM705, which are single-core
variants of NPCM750 and NPCM730, respectively. These are currently not
supported by QEMU.

Supported devices
-----------------

 * SMP (Dual Core Cortex-A9)
 * Cortex-A9MPCore built-in peripherals: SCU, GIC, Global Timer, Private Timer
   and Watchdog.
 * SRAM, ROM and DRAM mappings
 * System Global Control Registers (GCR)
 * Clock and reset controller (CLK)
 * Timer controller (TIM)
 * Serial ports (16550-based)
 * DDR4 memory controller (dummy interface indicating memory training is done)
 * OTP controllers (no protection features)
 * Flash Interface Unit (FIU; no protection features)
 * Random Number Generator (RNG)
 * USB host (USBH)
 * GPIO controller

Missing devices
---------------

 * LPC/eSPI host-to-BMC interface, including

   * Keyboard and mouse controller interface (KBCI)
   * Keyboard Controller Style (KCS) channels
   * BIOS POST code FIFO
   * System Wake-up Control (SWC)
   * Shared memory (SHM)
   * eSPI slave interface

 * Ethernet controllers (GMAC and EMC)
 * USB device (USBD)
 * SMBus controller (SMBF)
 * Peripheral SPI controller (PSPI)
 * Analog to Digital Converter (ADC)
 * SD/MMC host
 * PECI interface
 * Pulse Width Modulation (PWM)
 * Tachometer
 * PCI and PCIe root complex and bridges
 * VDM and MCTP support
 * Serial I/O expansion
 * LPC/eSPI host
 * Coprocessor
 * Graphics
 * Video capture
 * Encoding compression engine
 * Security features

Boot options
------------

The Nuvoton machines can boot from an OpenBMC firmware image, or directly into
a kernel using the ``-kernel`` option. OpenBMC images for `quanta-gsj` and
possibly others can be downloaded from the OpenPOWER jenkins :

   https://openpower.xyz/

The firmware image should be attached as an MTD drive. Example :

.. code-block:: bash

  $ qemu-system-arm -machine quanta-gsj -nographic \
      -drive file=image-bmc,if=mtd,bus=0,unit=0,format=raw

The default root password for test images is usually ``0penBmc``.