From 8363c876f6304da0b0fb96aa721ee50b3de2b2bf Mon Sep 17 00:00:00 2001 From: Jiaxun Yang Date: Tue, 18 Jun 2024 14:56:10 +0100 Subject: [PATCH] doc: New documentation for qemu-xtensa Introduce the board and provide instructions on how to get it work. Tested-by: Max Filippov Signed-off-by: Jiaxun Yang --- doc/board/emulation/index.rst | 1 + doc/board/emulation/qemu-xtensa.rst | 33 +++++++++++++++++++++++++++++ 2 files changed, 34 insertions(+) create mode 100644 doc/board/emulation/qemu-xtensa.rst diff --git a/doc/board/emulation/index.rst b/doc/board/emulation/index.rst index d3d6b8f3d8..98a0b26ad2 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 0000000000..fff23c1a9b --- /dev/null +++ b/doc/board/emulation/qemu-xtensa.rst @@ -0,0 +1,33 @@ +.. SPDX-License-Identifier: GPL-2.0+ +.. Copyright (C) 2024 Jiaxun Yang + +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 dc233c variant is tested against U-Boot. + +Building U-Boot +--------------- +Set the CROSS_COMPILE environment variable as usual, and run: + + make qemu-xtensa-dc233c_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 dc233c -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. -- 2.39.5