u-boot/arch/arm/mach-tegra/tegra186/nvtboot_board.c
Stephen Warren 2b950f3aea ARM: tegra: configure Ethernet address on Tegra186
On Tegra186, the bootloader which runs before U-Boot passes the Ethernet
MAC address to U-Boot using device tree. Extract this value and write it
to the environment, so that the Ethernet uclass picks it up and uses it
for the built-in Ethernet device.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
2016-11-07 11:28:16 -06:00

54 lines
1.2 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;
/*
* 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; not all cases care about Ethernet addresses */
set_ethaddr_from_nvtboot();
return 0;
}