tree 9a2dfa88c8453e5d8994ad5fa0f054d7fe30bb29
parent 34ca5429362fbdcdf204293bf8b78bbda2e15ea9
author Timothy Chen <timothytim@google.com> 1600150242 -0700
committer tjaychen <timothytim@google.com> 1600387973 -0700

[flash_ctrl] Add ECC to program / erase datapaths

- New parameters are defined to represent the "metadata" of flas
  - Software only has direct access to data portion
  - Metadata area is used for empty detection as well as ECC
  - There are currently no plans to make metadata directly accessible to
    software, although that can be done.
- ECC and scramble are always disabled / enabled at the same time.
- ECC is calculated on the scrambled data.
- There is no good DV / verilator support yet, To get around the issue,
  prim_generic_flash instantiates a memory for main, and another for metadata.
  - long term there will need to be a better backdoor solution to flash.
- ECC uncorrectable errors are forwarded up to both the host / controller
- When an uncorrectable error occurs, all F's are returned to the reading agent.

Signed-off-by: Timothy Chen <timothytim@google.com>

[flash_ctrl] update for review comments

Signed-off-by: Timothy Chen <timothytim@google.com>