Does rocket chip support cache flushing & data burst loading now？

**Type of issue**: feature request

**Impact**: no functional change

**Development Phase**: request

**Other information**

**What is the use case for changing the behavior?**

The issue provides no files, tests, or entry points. Start by locating Rocket Chip's cache and data-loading components, then clarify whether cache flushing and burst loading are supported and what behavior is expected. The issue does not define acceptance criteria or a clear meaning of done.

Written by the indexing model from the issue text.