[U-Boot] [RFC 03/22] thunderx: add FDT support

[Alexander Graf]

On 22.02.19 19:03, Tim Harvey wrote:
> The thunderx boards use the Cavium Bringup and Diagnostics Kit (BDK) as a
> secondary program loader (SPL). This initial boot firmware loads the
> device-tree and passes it to the next layer of software in X1.
> 
> Signed-off-by: Tim Harvey <tharvey at gateworks.com>

In the long run we maybe want to standardize on CONFIG_OF_PRIOR_STAGE
for aarch64 as well and then move rpi as well as this target over to it.
But for now, I think this solution is very reasonable.

> ---
>  arch/arm/mach-thunderx/Makefile        |  2 +-
>  arch/arm/mach-thunderx/fdt.c           | 50 ++++++++++++++++++++++++++
>  arch/arm/mach-thunderx/lowlevel_init.S | 31 ++++++++++++++++
>  board/cavium/thunderx/thunderx.c       | 12 +++++--
>  4 files changed, 92 insertions(+), 3 deletions(-)
>  create mode 100644 arch/arm/mach-thunderx/fdt.c
>  create mode 100644 arch/arm/mach-thunderx/lowlevel_init.S
> 
> diff --git a/arch/arm/mach-thunderx/Makefile b/arch/arm/mach-thunderx/Makefile
> index 34b6ecc2f9..fb457cb3e0 100644
> --- a/arch/arm/mach-thunderx/Makefile
> +++ b/arch/arm/mach-thunderx/Makefile
> @@ -1,2 +1,2 @@
>  # SPDX-License-Identifier: GPL-2.0+
> -obj-y	:= atf.o
> +obj-y	:= atf.o lowlevel_init.o fdt.o
> diff --git a/arch/arm/mach-thunderx/fdt.c b/arch/arm/mach-thunderx/fdt.c
> new file mode 100644
> index 0000000000..31f1128e9f
> --- /dev/null
> +++ b/arch/arm/mach-thunderx/fdt.c
> @@ -0,0 +1,50 @@
> +// SPDX-License-Identifier:	GPL-2.0+
> +/**
> + * Copyright (C) 2014, Cavium Inc.
> + */
> +
> +#include <common.h>
> +#include <malloc.h>
> +#include <errno.h>
> +#include <environment.h>
> +#include <fdtdec.h>
> +
> +/* From lowlevel_init.S */
> +extern unsigned long fdt_base_addr;
> +
> +/**
> + * If the firmware passed a device tree use it for U-Boot
> + *
> + * @return	FDT base address received from ATF in x1 register
> + */
> +void *board_fdt_blob_setup(void)
> +{
> +        if (fdt_magic(fdt_base_addr) != FDT_MAGIC)
> +                return NULL;
> +	return (void *)fdt_base_addr;
> +}
> +
> +int ft_board_setup(void *blob, bd_t *bd)
> +{
> +	int offset;
> +	int ret = 0;
> +
> +	debug("%s\n", __func__);
> +	ret = fdt_check_header(blob);
> +	if (ret < 0) {
> +		printf("ERROR: %s\n", fdt_strerror(ret));
> +		return ret;
> +	}
> +
> +	/* remove "cavium, bdk" node from DT */
> +	if (blob) {
> +		offset = fdt_path_offset(blob, "/cavium,bdk");
> +		if(offset >= 0) {
> +			ret = fdt_del_node(blob, offset);
> +			debug("%s deleted 'cavium,bdk' node\n", __func__);

Why remove it?


Alex