Does MPC5748G D-cache only support writethrough? or writeback is also supported?
If it supports both, how to configure it?
It only supports Write-through mode. Writeback (we called it Copy-back) mode has been removed, as I know, from all MPC57xx devices excluding MPC5777C, probably due to low utilization.
Copy-back mode exists on MPC55xx and MPC56xx legacy devices.
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