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由 Simon Glass 提交于
At present we have SPL_SERIAL and TPL_SERIAL but not piain SERIAL. This works because there is a special build rule in Makefile that always includes the drivers/serial directory. It is better to have all driver directories included by drivers/Makefile and there is already a rule in there for this purpose. It just needs a Kconfig for U-Boot proper, so add one. It is always enabled, for now, since that mimics the current behaviour. It should be possible to drop the strange 'SERIAL_PRESENT' option at some point and use SERIAL instead. Signed-off-by: NSimon Glass <sjg@chromium.org>
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