There's nothing wrong with this but it shouldn't be necessary. The kernel buffer in depthcharge only starts being used *after* depthcharge is entered, at which point both the ramstage and cbfs_cache from coreboot are no longer used. So it should not be a problem to overlap them. The only thing you need to watch out for is that the depthcharge program itself (i.e. what comes after CONFIG_BASE_ADDRESS) doesn't overlap with those regions.
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