fdt: Set kernaddr if fdt indicates a kernel is present
If kernel-offset is specified in the fdt, set an environment variable
so that scripts can access the attached kernel.
This can be used by a packaging program to tell U-Boot about a kernel
that has been downloaded alongside U-Boot. The value in the fdt is
the offset of the kernel from the start of the U-Boot image, so we can
find it just by adding CONFIG_SYS_TEXT_BASE.
It is then fairly easy to put something like this in the environment
variables in the board header file:
"if test ${kernaddr} != \"\"; then "\
"echo \"Using bundled kernel\"; "\
"bootm ${kernaddr};" \
"fi; "\
/* rest of boot sequence follows here */
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/main.c b/common/main.c
index 61c6cac..8052d42 100644
--- a/common/main.c
+++ b/common/main.c
@@ -333,6 +333,20 @@
hang();
}
+static void process_fdt_options(const void *blob)
+{
+ ulong addr;
+
+ /* Add an env variable to point to a kernel payload, if available */
+ addr = fdtdec_get_config_int(gd->fdt_blob, "kernel-offset", 0);
+ if (addr)
+ setenv_addr("kernaddr", (void *)(CONFIG_SYS_TEXT_BASE + addr));
+
+ /* Add an env variable to point to a root disk, if available */
+ addr = fdtdec_get_config_int(gd->fdt_blob, "rootdisk-offset", 0);
+ if (addr)
+ setenv_addr("rootaddr", (void *)(CONFIG_SYS_TEXT_BASE + addr));
+}
#endif /* CONFIG_OF_CONTROL */
@@ -451,6 +465,8 @@
if (env)
s = env;
+ process_fdt_options(gd->fdt_blob);
+
/*
* If the bootsecure option was chosen, use secure_boot_cmd().
* Always use 'env' in this case, since bootsecure requres that the