# v19.7.0

> This is a working draft for the up-coming 19.7.0 release.

We are pleased to announce the release of TT System Firmware firmware version 19.7.0 🥳🎉.

Major enhancements with this release include:

## Blackhole

### API Changes
- New CMFW message `TT_SMC_MSG_TOGGLE_GDDR_RESET` to reset and retrain a specific GDDR controller (0-7).
  Sample usage can be found in the [pytest file](https://github.com/tenstorrent/tt-system-firmware/tree/main/app/smc/pytest/e2e_smoke.py#L961).

### Developer Features
- DMFW and SMFW now store Zephyr's `APP_VERSION_STRING` and `APP_BUILD_VERSION` binary descriptors, which provide the app version and the FW bundle's git revision respectively. These are printed to the boot banner, and can also be accessed using Zephyr's [`west bindesc` tool](https://docs.zephyrproject.org/latest/services/binary_descriptors/index.html).

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### Stability Improvements

- Updated Blackhole ERISC FW to v1.9.0
  - Embedded erisc fw version at known location (offset 0x188) for SYSIP-190
  - Increased ERISC_CODE region by 4K, taken from ERISC_DATA region
  - Updated chip_info_exchange to be more of a handshake
  - Fixed send telemetry logic bug
  - Fixed bug where is eth_sel unset the core would still attempt SerDes init
  - Reworked SerDes synchronization between 2 ETH cores sharing a SerDes
  - Added per-lane SerDes reset control
    - Reworked port action up/down to properly bring link down
    - Reinit from reset only toggles lane resets instead of full SerDes reset

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### System Improvements
- Improved DRAM interface margins on Galaxy Rev C boards

### NOC
- Fixed NOC "logical_id" programming for GDDR ports (this does not functionally impact NOC translation, just how it is reported)

## Grendel

Added a virtual console logging driver, which supports outputting
logs from Zephyr's logging subsystem via the virtual console used in pre-SI
simulation

### Driver Additions

- Enabled driver for CDNS MIPI I3C peripheral

## Migration guide

An overview of required and recommended changes to make when migrating from the previous v19.6.0 release can be found in [19.7 Migration Guide](https://github.com/tenstorrent/tt-system-firmware/tree/main/doc/release/migration-guide-19.7.md).

## Full ChangeLog

The full ChangeLog from the previous v19.6.0 release can be found at the link below.

https://github.com/tenstorrent/tt-system-firmware/compare/v19.6.0...v19.7.0