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arm: guide: add list of QEMU targets and their feature set
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Add list of the available QEMU targets for Cortex-M
platforms in Zephyr along with the corresponding feature set.

Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
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ioannisg authored and cfriedt committed Jul 16, 2021
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Expand Up @@ -356,3 +356,39 @@ following:
status before the CPU idle API was called.

The Zephyr CPU Idling mechanism is detailed in :ref:`cpu_idle`.


QEMU
****

We use QEMU to verify the implemented features of the Cortex-M architecture port in Zephyr.
Adequate coverage is achieved by defining and utilizing a list of QEMU targets,
each with a specific architecture variant and Arm peripheral support list.

The table below lists the QEMU platform targets defined in Zephyr
along with the corresponding Cortex-M implementation variant and the peripherals
these targets emulate.

+---------------------------------+--------------------+--------------------+----------------+-----------------+----------------+
| | **QEMU target** |
+---------------------------------+--------------------+--------------------+----------------+-----------------+----------------+
| Architecture variant | Arm v6-M | Arm v7-M | Arm v8-M | Arm v8.1-M |
+---------------------------------+--------------------+--------------------+----------------+-----------------+----------------+
| | **qemu_cortex_m0** | **qemu_cortex_m3** | **mps2_an385** | **mps2_an521** | **mps3_an547** |
+---------------------------------+--------------------+--------------------+----------------+-----------------+----------------+
| **Emulated features** | |
+---------------------------------+--------------------+--------------------+----------------+-----------------+----------------+
| NVIC | Y | Y | Y | Y | Y |
+---------------------------------+--------------------+--------------------+----------------+-----------------+----------------+
| BASEPRI | N | Y | Y | Y | Y |
+---------------------------------+--------------------+--------------------+----------------+-----------------+----------------+
| SysTick | N | Y | Y | Y | Y |
+---------------------------------+--------------------+--------------------+----------------+-----------------+----------------+
| MPU | N | N | Y | Y | Y |
+---------------------------------+--------------------+--------------------+----------------+-----------------+----------------+
| FPU | N | N | N | Y | N |
+---------------------------------+--------------------+--------------------+----------------+-----------------+----------------+
| SPLIM | N | N | N | Y | Y |
+---------------------------------+--------------------+--------------------+----------------+-----------------+----------------+
| TrustZone-M | N | N | N | Y | N |
+---------------------------------+--------------------+--------------------+----------------+-----------------+----------------+

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