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doc: ls1046ardb: Expand boot mode section
This adds some additional info about booting from different sources, including the correct switch positions. Signed-off-by: Sean Anderson <sean.anderson@seco.com>
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@ -95,6 +95,17 @@ Start Address End Address Description Size
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Booting Options
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---------------
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- QSPI boot
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- SD boot
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- eMMC boot
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NB: The reference manual documents the RCW source with the *least-significant
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bit first*.
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QSPI boot
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^^^^^^^^^
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This is the default. ``{ SW5[0:8], SW4[0] }`` should be ``0010_0010_0``.
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SD boot and eMMC boot
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^^^^^^^^^^^^^^^^^^^^^
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``{ SW5[0:8], SW4[0] }`` should be ``0010_0000_0``. eMMC is selected only if
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there is no SD card in the slot.
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