Commit 510e379c authored by Bin Meng's avatar Bin Meng Committed by Andes
Browse files

riscv: Add QEMU virt board support



This adds QEMU RISC-V 'virt' board target support, with the hope of
helping people easily test U-Boot on RISC-V.

The QEMU virt machine models a generic RISC-V virtual machine with
support for the VirtIO standard networking and block storage devices.
It has CLINT, PLIC, 16550A UART devices in addition to VirtIO and
it also uses device-tree to pass configuration information to guest
software. It implements RISC-V privileged architecture spec v1.10.

Both 32-bit and 64-bit builds are supported. Support is pretty much
preliminary, only booting to U-Boot shell with the UART driver on
a single core. Booting Linux is not supported yet.
Signed-off-by: Bin Meng's avatarBin Meng <bmeng.cn@gmail.com>
Reviewed-by: default avatarLukas Auer <lukas.auer@aisec.fraunhofer.de>
parent cd1f45c2
......@@ -11,9 +11,13 @@ choice
config TARGET_AX25_AE350
bool "Support ax25-ae350"
config TARGET_QEMU_VIRT
bool "Support QEMU Virt Board"
endchoice
source "board/AndesTech/ax25-ae350/Kconfig"
source "board/emulation/qemu-riscv/Kconfig"
choice
prompt "CPU selection"
......
# SPDX-License-Identifier: GPL-2.0+
#
# Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
obj-y += dram.o
obj-y += cpu.o
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
*/
#include <common.h>
#include <command.h>
/*
* cleanup_before_linux() is called just before we call linux
* it prepares the processor for linux
*
* we disable interrupt and caches.
*/
int cleanup_before_linux(void)
{
disable_interrupts();
/* turn off I/D-cache */
return 0;
}
int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
printf("reset unsupported yet\n");
return 0;
}
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
*/
#include <common.h>
#include <fdtdec.h>
int dram_init(void)
{
return fdtdec_setup_mem_size_base();
}
int dram_init_banksize(void)
{
return fdtdec_setup_memory_banksize();
}
if TARGET_QEMU_VIRT
config SYS_BOARD
default "qemu-riscv"
config SYS_VENDOR
default "emulation"
config SYS_CPU
default "qemu"
config SYS_CONFIG_NAME
default "qemu-riscv"
config SYS_TEXT_BASE
default 0x80000000
config BOARD_SPECIFIC_OPTIONS # dummy
def_bool y
imply SYS_NS16550
endif
QEMU RISC-V 'VIRT' BOARD
M: Bin Meng <bmeng.cn@gmail.com>
S: Maintained
F: board/emulation/qemu-riscv/
F: include/configs/qemu-riscv.h
F: configs/qemu-riscv32_defconfig
F: configs/qemu-riscv64_defconfig
# SPDX-License-Identifier: GPL-2.0+
#
# Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
obj-y += qemu-riscv.o
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
*/
#include <common.h>
#include <fdtdec.h>
#define MROM_FDT_ADDR 0x1020
int board_init(void)
{
return 0;
}
void *board_fdt_blob_setup(void)
{
/*
* QEMU loads a generated DTB for us immediately
* after the reset vectors in the MROM
*/
return (void *)MROM_FDT_ADDR;
}
CONFIG_RISCV=y
CONFIG_TARGET_QEMU_VIRT=y
CONFIG_NR_DRAM_BANKS=1
CONFIG_DISPLAY_CPUINFO=y
CONFIG_DISPLAY_BOARDINFO=y
CONFIG_OF_BOARD=y
CONFIG_RISCV=y
CONFIG_TARGET_QEMU_VIRT=y
CONFIG_CPU_RISCV_64=y
CONFIG_NR_DRAM_BANKS=1
CONFIG_DISPLAY_CPUINFO=y
CONFIG_DISPLAY_BOARDINFO=y
CONFIG_OF_BOARD=y
# SPDX-License-Identifier: GPL-2.0+
#
# Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
U-Boot on QEMU's 'virt' machine on RISC-V
=========================================
QEMU for RISC-V supports a special 'virt' machine designed for emulation and
virtualization purposes. This document describes how to run U-Boot under it.
Both 32-bit 64-bit targets are supported.
The QEMU virt machine models a generic RISC-V virtual machine with support for
the VirtIO standard networking and block storage devices. It has CLINT, PLIC,
16550A UART devices in addition to VirtIO and it also uses device-tree to pass
configuration information to guest software. It implements RISC-V privileged
architecture spec v1.10.
Building U-Boot
---------------
Set the CROSS_COMPILE environment variable as usual, and run:
- For 32-bit RISC-V:
make qemu-riscv32_defconfig
make
- For 64-bit RISC-V:
make qemu-riscv64_defconfig
make
Running U-Boot
--------------
The minimal QEMU command line to get U-Boot up and running is:
- For 32-bit RISC-V:
qemu-system-riscv32 -nographic -machine virt -kernel u-boot
- For 64-bit RISC-V:
qemu-system-riscv64 -nographic -machine virt -kernel u-boot
The commands above create targets with 128MiB memory by default.
A freely configurable amount of RAM can be created via the '-m'
parameter. For example, '-m 2G' creates 2GiB memory for the target,
and the memory node in the embedded DTB created by QEMU reflects
the new setting.
These have been tested in QEMU 3.0.0.
/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
*/
#ifndef __CONFIG_H
#define __CONFIG_H
#include <linux/sizes.h>
#define CONFIG_SYS_SDRAM_BASE 0x80000000
#define CONFIG_SYS_INIT_SP_ADDR (CONFIG_SYS_SDRAM_BASE + SZ_2M)
#define CONFIG_SYS_LOAD_ADDR (CONFIG_SYS_SDRAM_BASE + SZ_2M)
#define CONFIG_SYS_MALLOC_LEN SZ_8M
/* Environment options */
#define CONFIG_ENV_SIZE SZ_4K
#endif /* __CONFIG_H */
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