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|**Time**|**Title**|**Speaker(s)**|
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|14:00 - 14:30|WR status at KM3NeT: current and future developments|Tommaso Chiarusi (INFN), Diego Real (IFIC)|
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|14:30 - 15:00|White Rabbit Network at GSI - stretching WR switches|Enkhbold Ochirsuren (GSI)|
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|14:30 - 15:00|||
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|15:00 - 15:30|WR deployment at LHAASO and other works|Guanghua Gong (Tsinghua University)|
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|15:30 - 15:45|Coffee break||
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|15:45 - 16:15|Porting SPEC drivers to current Linux kernels and embedded ARM boards for WRTD applications|Mathis Marion (INPG), Gwenhael Goavec-Merou (FEMTO-ST), Jean-Michel Friedt (FEMTO-ST)|
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### Thursday
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- **White Rabbit Network at GSI - stretching WR switches**: A number of White Rabbit timing system instances are currently employed for acceleration control by GSI. Each instance is application-specific, but they all are maintained uniformly. In addition, common systems for WR network management, monitoring and diagnostic are co-supervised by the control system administration with less effort. These are mostly brought by intensive utilization of networking functionalities embedded in the WR switch. Here, an improved WR network infrastructure, which was re-built last year, is presented.
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- **WR deployment at LHAASO and other works**: The LHAASO experiment has been fully operational since last June and discovered PeVatrons from our Galaxy. The more than six thousand detector units are synchronized to sub-ns level with the help of WR technology. The deployment of the WR network and some running status will be given in this report.
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- **Porting SPEC drivers to current Linux kernels and embedded ARM boards for WRTD applications**: In the context of distributed multistatic RADAR systems, we are considering using White Rabbit for synchronizing radiofrequency receivers. Starting with an initial demonstration receiving the continuous wave emitted by GRAVES from Eastern France at 143.05 MHz, multiple Ettus Research X310 are synchronized for complementing Doppler target velocity measurement with direction of arrival and hence location of the target. Sub-degree phase resolution along the distributed receiver array requires sub-20 ps phase alignment of the clocks driving the receivers as provided by a White Rabbit Switch associated with each X310. In order to increase the number of receiving sites by decreasing cost, size and consumption, running SPEC boards fitted with analog to digital converters on embedded boards is considered. With the wide availability of the Compute Module 4 OEM version of the Raspberry Pi 4 and its PCIe slot, the White Rabbit Trigger Distribution (WRTD) framework was ported to Buildroot used to cross-compile the embedded image. Doing so required tuning some of the driver functionality to match ARM-architecture requirements in addition to adapting to current Linux kernel API. Thanks to these efforts, runnig WRTD on embedded ARM-based boards is now functional. Perspectives include disciplining the ADC clock on White Rabbit to synchronize data sampling.
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- **The future of White Rabbit**: An open discussion session with the aim of identifying past and current successes and issues and finding the best path forward for the WR community. In particular, we will discuss the latest draft of the [WR Collaboration proposal](https://cernbox.cern.ch/index.php/s/PPUdASzjKyDBVXU) and try to decide if there is enough support to launch the effort in 2022.
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