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u-boot/doc/board/aspeed/ibex-ast2700.rst
Chia-Wei Wang 9efcb10a09 riscv: Add AST2700 SoC initial platform support
AST2700 SoCs integrates a Ibex 32-bits RISC-V core as the boot MCU
for the first stage bootloader execution, namely SPL.

This patch implements the preliminary base to successfully run SPL
on this RV32-based MCU to the console banner message.

Signed-off-by: Chia-Wei Wang <chiawei_wang@aspeedtech.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
2024-09-11 20:35:03 +08:00

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.. SPDX-License-Identifier: GPL-2.0+
IBex AST2700
============
AST2700 integrates an IBex RISC-V 32-bits CPU as the boot MCU to execute the
first stage bootlaoder, namely SPL.
Build
-----
1. Prepare the toolchains and make sure the $PATH to toolchains is correct.
2. Use `make ibex-ast2700_defconfig` in u-boot root to build the image
Running U-Boot SPL
------------------
The U-Boot SPL will boot in M mode and load the FIT image which includes
the 2nd stage bootloaders executed by the main processor Cortex-A35.
Burn U-Boot to SPI Flash
------------------------
Use SPI flash programmer (e.g. SF100) to program the u-book-spl.bin with the
offset 0x80 bytes to the SPI flash beginning.