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ARM: tegra: allow passing cboot DTB to the kernel

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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>
This commit is contained in:
Stephen Warren 2016-12-02 12:26:42 -07:00 committed by Tom Warren
parent 87f5f5417f
commit a182e69d79
1 changed files with 18 additions and 0 deletions
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18
arch/arm/mach-tegra/tegra186/nvtboot_board.c
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@ -11,6 +11,19 @@
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.
@ -47,6 +60,11 @@ static int set_ethaddr_from_nvtboot(void)
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();