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Benjamin Herrenschmidt f9f18906a3 soc: Rename wb_dram_ctrl to wb_ext_io and rework decoding
This makes the control bus currently going out of "soc" towards
litedram more generic for external IO devices added by the
top-level rather than inside the SoC proper.

This is mostly renaming of signals and a small change on how the
address decoder operates, using a separate "cascaded" decode for
the external IOs.

We make the region 0xc8nn_nnnn be the "external IO" region for
now.

This will make it easier / cleaner to add more external devices.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2020-06-14 14:00:35 +10:00
..
2020-05-08 21:06:16 +10:00