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On x86 boards Linux uses a block of binary data to provide information about the command line, memory map, etc. Provide a way to store this in the bootflow so it can be passed on to the OS. No attempt is made to generalise the code, since other archs don't need this information. The field is present always, though, to avoid needing accessors or #ifdefs when building code on other archs. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>