u-boot/arch/arm/mach-tegra/tegra186/nvtboot_board.c
Stephen Warren a182e69d79 ARM: tegra: allow passing cboot DTB to the kernel
Some users may wish to pass the cboot-supplied DTB to the booted kernel
rather than having U-Boot load the DTB itself. To allow this, expose the
address of the cboot-supplied DTB in environment variable $fdt_addr. At
least when using extlinux.conf, if the user doesn't explicitly specify
which DTB to pass to the kernel, U-Boot passes the DTB referred to by
this variable.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
2017-01-03 10:34:13 -07:00

72 lines
1.5 KiB
C

/*
* Copyright (c) 2016, NVIDIA CORPORATION.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <fdt_support.h>
#include <fdtdec.h>
#include <asm/arch/tegra.h>
extern unsigned long nvtboot_boot_x0;
static int set_fdt_addr(void)
{
int ret;
ret = setenv_hex("fdt_addr", nvtboot_boot_x0);
if (ret) {
printf("Failed to set fdt_addr to point at DTB: %d\n", ret);
return ret;
}
return 0;
}
/*
* Attempt to use /chosen/nvidia,ether-mac in the nvtboot DTB to U-Boot's
* ethaddr environment variable if possible.
*/
static int set_ethaddr_from_nvtboot(void)
{
const void *nvtboot_blob = (void *)nvtboot_boot_x0;
int ret, node, len;
const u32 *prop;
/* Already a valid address in the environment? If so, keep it */
if (getenv("ethaddr"))
return 0;
node = fdt_path_offset(nvtboot_blob, "/chosen");
if (node < 0) {
printf("Can't find /chosen node in nvtboot DTB\n");
return node;
}
prop = fdt_getprop(nvtboot_blob, node, "nvidia,ether-mac", &len);
if (!prop) {
printf("Can't find nvidia,ether-mac property in nvtboot DTB\n");
return -ENOENT;
}
ret = setenv("ethaddr", (void *)prop);
if (ret) {
printf("Failed to set ethaddr from nvtboot DTB: %d\n", ret);
return ret;
}
return 0;
}
int tegra_soc_board_init_late(void)
{
/*
* Ignore errors here; the value may not be used depending on
* extlinux.conf or boot script content.
*/
set_fdt_addr();
/* Ignore errors here; not all cases care about Ethernet addresses */
set_ethaddr_from_nvtboot();
return 0;
}