LXR uboot/board/emulation/qemu-riscv/qemu-riscv.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
   4 */
   5
   6#include <common.h>
   7#include <dm.h>
   8#include <fdtdec.h>
   9#include <virtio_types.h>
  10#include <virtio.h>
  11
  12int board_init(void)
  13{
  14        /*
  15         * Make sure virtio bus is enumerated so that peripherals
  16         * on the virtio bus can be discovered by their drivers
  17         */
  18        virtio_init();
  19
  20        return 0;
  21}
  22
  23int board_late_init(void)
  24{
  25        ulong kernel_start;
  26        ofnode chosen_node;
  27        int ret;
  28
  29        chosen_node = ofnode_path("/chosen");
  30        if (!ofnode_valid(chosen_node)) {
  31                debug("No chosen node found, can't get kernel start address\n");
  32                return 0;
  33        }
  34
  35#ifdef CONFIG_ARCH_RV64I
  36        ret = ofnode_read_u64(chosen_node, "riscv,kernel-start",
  37                              (u64 *)&kernel_start);
  38#else
  39        ret = ofnode_read_u32(chosen_node, "riscv,kernel-start",
  40                              (u32 *)&kernel_start);
  41#endif
  42        if (ret) {
  43                debug("Can't find kernel start address in device tree\n");
  44                return 0;
  45        }
  46
  47        env_set_hex("kernel_start", kernel_start);
  48
  49        return 0;
  50}
  51
  52/*
  53 * QEMU specifies the location of Linux (supplied with the -kernel argument)
  54 * in the device tree using the riscv,kernel-start and riscv,kernel-end
  55 * properties. We currently rely on the SBI implementation of BBL to run
  56 * Linux and therefore embed Linux as payload in BBL. This causes an issue,
  57 * because BBL detects the kernel properties in the device tree and ignores
  58 * the Linux payload as a result. To work around this issue, we clear the
  59 * kernel properties before booting Linux.
  60 *
  61 * This workaround can be removed, once we do not require BBL for its SBI
  62 * implementation anymore.
  63 */
  64int ft_board_setup(void *blob, bd_t *bd)
  65{
  66        int chosen_offset, ret;
  67
  68        chosen_offset = fdt_path_offset(blob, "/chosen");
  69        if (chosen_offset < 0)
  70                return 0;
  71
  72#ifdef CONFIG_ARCH_RV64I
  73        ret = fdt_setprop_u64(blob, chosen_offset, "riscv,kernel-start", 0);
  74#else
  75        ret = fdt_setprop_u32(blob, chosen_offset, "riscv,kernel-start", 0);
  76#endif
  77        if (ret)
  78                return ret;
  79
  80#ifdef CONFIG_ARCH_RV64I
  81        ret = fdt_setprop_u64(blob, chosen_offset, "riscv,kernel-end", 0);
  82#else
  83        ret = fdt_setprop_u32(blob, chosen_offset, "riscv,kernel-end", 0);
  84#endif
  85        if (ret)
  86                return ret;
  87
  88        return 0;
  89}
  90