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>
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@ -333,6 +333,20 @@ err:
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hang();
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}
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static void process_fdt_options(const void *blob)
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{
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ulong addr;
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/* Add an env variable to point to a kernel payload, if available */
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addr = fdtdec_get_config_int(gd->fdt_blob, "kernel-offset", 0);
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if (addr)
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setenv_addr("kernaddr", (void *)(CONFIG_SYS_TEXT_BASE + addr));
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/* Add an env variable to point to a root disk, if available */
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addr = fdtdec_get_config_int(gd->fdt_blob, "rootdisk-offset", 0);
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if (addr)
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setenv_addr("rootaddr", (void *)(CONFIG_SYS_TEXT_BASE + addr));
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}
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#endif /* CONFIG_OF_CONTROL */
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@ -451,6 +465,8 @@ void main_loop (void)
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if (env)
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s = env;
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process_fdt_options(gd->fdt_blob);
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/*
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* If the bootsecure option was chosen, use secure_boot_cmd().
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* Always use 'env' in this case, since bootsecure requres that the
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