mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-13 06:42:56 +00:00
a182e69d79
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>
72 lines
1.5 KiB
C
72 lines
1.5 KiB
C
/*
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* Copyright (c) 2016, NVIDIA CORPORATION.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <fdt_support.h>
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#include <fdtdec.h>
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#include <asm/arch/tegra.h>
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extern unsigned long nvtboot_boot_x0;
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static int set_fdt_addr(void)
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{
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int ret;
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ret = setenv_hex("fdt_addr", nvtboot_boot_x0);
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if (ret) {
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printf("Failed to set fdt_addr to point at DTB: %d\n", ret);
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return ret;
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}
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return 0;
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}
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/*
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* Attempt to use /chosen/nvidia,ether-mac in the nvtboot DTB to U-Boot's
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* ethaddr environment variable if possible.
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*/
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static int set_ethaddr_from_nvtboot(void)
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{
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const void *nvtboot_blob = (void *)nvtboot_boot_x0;
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int ret, node, len;
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const u32 *prop;
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/* Already a valid address in the environment? If so, keep it */
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if (getenv("ethaddr"))
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return 0;
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node = fdt_path_offset(nvtboot_blob, "/chosen");
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if (node < 0) {
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printf("Can't find /chosen node in nvtboot DTB\n");
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return node;
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}
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prop = fdt_getprop(nvtboot_blob, node, "nvidia,ether-mac", &len);
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if (!prop) {
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printf("Can't find nvidia,ether-mac property in nvtboot DTB\n");
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return -ENOENT;
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}
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ret = setenv("ethaddr", (void *)prop);
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if (ret) {
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printf("Failed to set ethaddr from nvtboot DTB: %d\n", ret);
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return ret;
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}
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return 0;
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}
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int tegra_soc_board_init_late(void)
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{
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/*
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* Ignore errors here; the value may not be used depending on
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* extlinux.conf or boot script content.
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*/
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set_fdt_addr();
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/* Ignore errors here; not all cases care about Ethernet addresses */
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set_ethaddr_from_nvtboot();
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return 0;
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}
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