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fdt: Set kernaddr if fdt indicates a kernel is present

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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>
This commit is contained in:
Simon Glass 2012-10-25 16:31:11 +00:00 • committed by Gerald Van Baren
parent d95f6ec733
commit fcabc24f4f
1 changed files with 16 additions and 0 deletions
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16
common/main.c
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@ -333,6 +333,20 @@ err:
hang(); 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 */ #endif /* CONFIG_OF_CONTROL */
@ -451,6 +465,8 @@ void main_loop (void)
if (env) if (env)
s = env; s = env;
process_fdt_options(gd->fdt_blob);
/* /*
* If the bootsecure option was chosen, use secure_boot_cmd(). * If the bootsecure option was chosen, use secure_boot_cmd().
* Always use 'env' in this case, since bootsecure requres that the * Always use 'env' in this case, since bootsecure requres that the