Hi Lukas,
On Tue, Oct 30, 2018 at 8:57 PM Lukas Auer
<lukas.a...@aisec.fraunhofer.de> wrote:
>
> QEMU embeds the location of the kernel image in the device tree. Store
> this address in the environment as variable kernel_start and use it in
> CONFIG_BOOTCOMMAND to boot the kernel. Use the device tree passed by the
> prior boot stage to boot Linux.
>
> Signed-off-by: Lukas Auer <lukas.a...@aisec.fraunhofer.de>
> ---
>
> Changes in v2:
> - Rebase onto u-boot-dm/next
> - Boot Linux with the device tree provided by the prior boot stage
>
> board/emulation/qemu-riscv/Kconfig | 1 +
> board/emulation/qemu-riscv/qemu-riscv.c | 29 +++++++++++++++++++++++++
> configs/qemu-riscv32_defconfig | 1 +
> configs/qemu-riscv64_defconfig | 1 +
> include/configs/qemu-riscv.h | 10 ++++++++-
> 5 files changed, 41 insertions(+), 1 deletion(-)
>
> diff --git a/board/emulation/qemu-riscv/Kconfig
> b/board/emulation/qemu-riscv/Kconfig
> index 37a80db6a9..be5839b7db 100644
> --- a/board/emulation/qemu-riscv/Kconfig
> +++ b/board/emulation/qemu-riscv/Kconfig
> @@ -29,5 +29,6 @@ config BOARD_SPECIFIC_OPTIONS # dummy
> imply CMD_EXT2
> imply CMD_EXT4
> imply CMD_FAT
> + imply BOARD_LATE_INIT
>
> endif
> diff --git a/board/emulation/qemu-riscv/qemu-riscv.c
> b/board/emulation/qemu-riscv/qemu-riscv.c
> index 2ce093e19a..ee20983095 100644
> --- a/board/emulation/qemu-riscv/qemu-riscv.c
> +++ b/board/emulation/qemu-riscv/qemu-riscv.c
> @@ -19,3 +19,32 @@ int board_init(void)
>
> return 0;
> }
> +
> +int board_late_init(void)
> +{
> + ulong kernel_start;
> + ofnode chosen_node;
> + int ret;
> +
> + chosen_node = ofnode_path("/chosen");
> + if (!ofnode_valid(chosen_node)) {
> + printf("No chosen node found\n");
> + return 0;
> + }
> +
> +#ifdef CONFIG_ARCH_RV64I
> + ret = ofnode_read_u64(chosen_node, "riscv,kernel-start",
> + (u64 *)&kernel_start);
> +#else
> + ret = ofnode_read_u32(chosen_node, "riscv,kernel-start",
> + (u32 *)&kernel_start);
> +#endif
> + if (ret) {
> + printf("Can't find kernel start address in device tree\n");
I think we need use 'debug' instead of 'printf' here, for situation
that kernel is not passed to QEMU.
> + return 0;
> + }
> +
> + env_set_hex("kernel_start", kernel_start);
> +
> + return 0;
> +}
[snip]
Regards,
Bin
_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
https://lists.denx.de/listinfo/u-boot
