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doc: sophgo: milkv_duo: document Milk-V Duo board

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Add document for Milk-V Duo board which based on Sophgo's CV1800B SoC.

Signed-off-by: Kongyang Liu <seashell11234455@gmail.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
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Kongyang Liu 2024-01-28 15:05:26 +08:00 • committed by Leo Yu-Chi Liang
parent 0dc6ee6d2b
commit 36278b7051
3 changed files with 73 additions and 0 deletions
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doc/board/index.rst
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@ -46,6 +46,7 @@ Board-specific doc
sifive/index
sipeed/index
socionext/index
sophgo/index
st/index
starfive/index
ste/index

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doc/board/sophgo/index.rst Normal file
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.. SPDX-License-Identifier: GPL-2.0+
Sophgo
======
.. toctree::
:maxdepth: 1
milkv_duo

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doc/board/sophgo/milkv_duo.rst Normal file
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.. SPDX-License-Identifier: GPL-2.0+
Milk-V Duo
==========
CV1800B RISC-V SoC
------------------
The CV1800B is a high-performance, low-power 1+1 64-bit RISC-V SoC from Sophgo.
Mainline support
----------------
The support for following drivers are already enabled:
1. ns16550 UART Driver.
Building
~~~~~~~~
1. Add the RISC-V toolchain to your PATH.
2. Setup ARCH & cross compilation environment variable:
.. code-block:: console
export CROSS_COMPILE=<riscv64 toolchain prefix>
cd <U-Boot-dir>
make milkv_duo_defconfig
make
This will generate u-boot-dtb.bin
Booting
~~~~~~~
Currently, we rely on vendor FSBL(First Stage Boot Loader) to initialize the
clock and load the u-boot image, then bootup from it.
Alternatively, to run u-boot-dtb.bin on top of FSBL, follow these steps:
1. Use the vendor-provided tool to create a unified fip.bin file containing
FSBL, OpenSBI, and U-Boot.
2. Place the generated fip.bin file into the FAT partition of the SD card.
3. Insert the SD card into the board and power it on.
The board will automatically execute the FSBL from the fip.bin file.
Subsequently, it will transition to OpenSBI, and finally, OpenSBI will invoke
U-Boot.
Sample boot log from Milk-V Duo board
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. code-block:: none
U-Boot 2024.01-rc5-00010-g51965baa36 (Dec 28 2023 - 13:15:53 +0800)milkv_duo
DRAM: 63.3 MiB
Core: 10 devices, 8 uclasses, devicetree: separate
Loading Environment from nowhere... OK
In: serial@4140000
Out: serial@4140000
Err: serial@4140000
Net: No ethernet found.
milkv_duo# cpu detail
0: cpu@0 rv64imafdc
ID = 0, freq = 0 Hz: L1 cache, MMU
milkv_duo#