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>
diff --git a/arch/arm/mach-tegra/tegra186/nvtboot_board.c b/arch/arm/mach-tegra/tegra186/nvtboot_board.c
index 1d78346..feb935f 100644
--- a/arch/arm/mach-tegra/tegra186/nvtboot_board.c
+++ b/arch/arm/mach-tegra/tegra186/nvtboot_board.c
@@ -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 @@
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();