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Provide a page describing the usage of U-Boot on the LicheeRV Nano and a description of the board. Signed-off-by: Thomas Bonnefille <thomas.bonnefille@bootlin.com> Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
73 lines
1.9 KiB
ReStructuredText
73 lines
1.9 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0+
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LicheeRV Nano
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=============
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SG2002 RISC-V SoC
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-----------------
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The SG2002 is a high-performance, low-power 64-bit RISC-V/ARM SoC from Sophgo.
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Mainline support
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----------------
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The support for following drivers are already enabled:
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1. ns16550 UART Driver.
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2. Synopsys Designware MSHC Driver
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Building
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~~~~~~~~
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1. Add the RISC-V toolchain to your PATH.
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2. Setup ARCH & cross compilation environment variable:
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.. code-block:: console
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export CROSS_COMPILE=<riscv64 toolchain prefix>
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cd <U-Boot-dir>
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make sipeed_licheerv_nano_defconfig
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make
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This will generate u-boot.bin
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Booting
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~~~~~~~
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Currently, we rely on vendor FSBL (First Stage Boot Loader) to initialize the
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clock and load the u-boot image, then bootup from it.
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To run u-boot.bin on top of FSBL, follow these steps:
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1. Use mainline OpenSBI with a newer version than 1.5 to generate fw_dynamic.
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2. Generate a compatible u-boot.bin using U-Boot with the LicheeRV Nano default
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configuration.
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3. Use the vendor-provided tool [1] to create a unified fip.bin file containing
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FSBL, OpenSBI, and U-Boot.
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Note that you will have to use the file cv181x.bin as the FSBL.
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2. Place the generated fip.bin file into the FAT partition of the SD card.
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3. Insert the SD card into the board and power it on.
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The board will automatically execute the FSBL from the fip.bin file.
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Subsequently, it will transition to OpenSBI, and finally, OpenSBI will invoke
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U-Boot.
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[1]: https://github.com/sophgo/fiptool
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Sample boot log from LicheeRV Nano board
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. code-block:: none
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U-Boot 2024.10 (Oct 24 2024 - 15:00:20 +0200)licheerv_nano
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DRAM: 256 MiB
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Core: 19 devices, 11 uclasses, devicetree: separate
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MMC: mmc@4310000: 0
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Loading Environment from nowhere... OK
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In: serial@4140000
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Out: serial@4140000
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Err: serial@4140000
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Net: No ethernet found.
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Hit any key to stop autoboot: 0
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licheerv_nano#
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