x86: Add an option to control the position of U-Boot
The existing work-around for positioning U-Boot in the ROM when it actually runs from RAM still exists and there is not obvious way to change this. Add a proper Kconfig option to handle this case. This also adds a new bool property to indicate whether CONFIG_SYS_TEXT_BASE exists. Signed-off-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NBin Meng <bmeng.cn@gmail.com>
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