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由 York Sun 提交于
As the name may be confusing, the CONFIG_SYS_MEM_TOP_HIDE reserves some memory from the end of ram, tracked by gd->ram_size. It is not always the top of u-boot visible memory. Rewrite the macro with a weak function to provide flexibility for complex calcuation. Legacy use of this macro is still supported. Signed-off-by: NYork Sun <yorksun@freescale.com> Reviewed-by: NSimon Glass <sjg@chromium.org>
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