Introduce the board and provide instructions on how to get it work.
Signed-off-by: Jiaxun Yang jiaxun.yang@flygoat.com --- doc/board/emulation/index.rst | 1 + doc/board/emulation/qemu-xtensa.rst | 33 +++++++++++++++++++++++++++++++++ 2 files changed, 34 insertions(+)
diff --git a/doc/board/emulation/index.rst b/doc/board/emulation/index.rst index d3d6b8f3d86b..98a0b26ad245 100644 --- a/doc/board/emulation/index.rst +++ b/doc/board/emulation/index.rst @@ -14,3 +14,4 @@ Emulation qemu-ppce500 qemu-riscv qemu-x86 + qemu-xtensa diff --git a/doc/board/emulation/qemu-xtensa.rst b/doc/board/emulation/qemu-xtensa.rst new file mode 100644 index 000000000000..fdab6d7c439d --- /dev/null +++ b/doc/board/emulation/qemu-xtensa.rst @@ -0,0 +1,33 @@ +.. SPDX-License-Identifier: GPL-2.0+ +.. Copyright (C) 2024 Jiaxun Yang jiaxun.yang@flygoat.com + +QEMU Xtensa +=========== + +QEMU for Xtensa supports a special 'virt' machine designed for emulation and +virtualization purposes. This document describes how to run U-Boot under it. + +The QEMU virt machine models a generic Xtensa virtual machine with PCI Bus +and Xtensa ISS simcall semihosting support. It supports many different Xtensa +CPU configuration. Currently, only dc232b variant is tested against U-Boot. + +Building U-Boot +--------------- +Set the CROSS_COMPILE environment variable as usual, and run: + + make qemu-xtensa-dc232b_defconfig + make + +Note that Xtensa's toolchain is bounded to CPU configuration, you must use +the toolchain built for exactly the same CPU configuration as you selected +in U-Boot. + +Running U-Boot +-------------- +The minimal QEMU command line to get U-Boot up and running is: + + qemu-system-xtensa -nographic -machine virt -cpu dc232b -semihosting -kernel ./u-boot.elf + +You many change cpu option to match your U-Boot CPU type configuration. +semihosting option is mandatory because this is the only way to interact +with U-Boot in command line.