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docs/system/arm/mps2.rst: Document the new mps3-an524 board 

Add brief documentation of the new mps3-an524 board.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210215115138.20465-24-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2021-02-15 11:51:37 +00:00
parent 41745d2053
commit ced8bb04ae
1 changed files with 18 additions and 6 deletions
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docs/system/arm/mps2.rst
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@ -1,12 +1,15 @@
Arm MPS2 boards (``mps2-an385``, ``mps2-an386``, ``mps2-an500``, ``mps2-an505``, ``mps2-an511``, ``mps2-an521``)
================================================================================================================
Arm MPS2 and MPS3 boards (``mps2-an385``, ``mps2-an386``, ``mps2-an500``, ``mps2-an505``, ``mps2-an511``, ``mps2-an521``, ``mps3-an524``)
=========================================================================================================================================
These board models all use Arm M-profile CPUs.
The Arm MPS2 and MPS2+ dev boards are FPGA based (the 2+ has a bigger
FPGA but is otherwise the same as the 2). Since the CPU itself
and most of the devices are in the FPGA, the details of the board
as seen by the guest depend significantly on the FPGA image.
The Arm MPS2, MPS2+ and MPS3 dev boards are FPGA based (the 2+ has a
bigger FPGA but is otherwise the same as the 2; the 3 has a bigger
FPGA again, can handle 4GB of RAM and has a USB controller and QSPI flash).
Since the CPU itself and most of the devices are in the FPGA, the
details of the board as seen by the guest depend significantly on the
FPGA image.
QEMU models the following FPGA images:
@ -22,12 +25,21 @@ QEMU models the following FPGA images:
Cortex-M3 'DesignStart' as documented in Arm Application Note AN511
``mps2-an521``
Dual Cortex-M33 as documented in Arm Application Note AN521
``mps3-an524``
Dual Cortex-M33 on an MPS3, as documented in Arm Application Note AN524
Differences between QEMU and real hardware:
- AN385/AN386 remapping of low 16K of memory to either ZBT SSRAM1 or to
block RAM is unimplemented (QEMU always maps this to ZBT SSRAM1, as
if zbt_boot_ctrl is always zero)
- AN524 remapping of low memory to either BRAM or to QSPI flash is
unimplemented (QEMU always maps this to BRAM, ignoring the
SCC CFG_REG0 memory-remap bit)
- QEMU provides a LAN9118 ethernet rather than LAN9220; the only guest
visible difference is that the LAN9118 doesn't support checksum
offloading
- QEMU does not model the QSPI flash in MPS3 boards as real QSPI
flash, but only as simple ROM, so attempting to rewrite the flash
from the guest will fail
- QEMU does not model the USB controller in MPS3 boards