As an AI language model, I do not have access to the context or code surrounding this log message. However, based on the information provided, it appears that the GnssHAL_GnssInterface is reporting a callback function for satellite status updates. The "b" may indicate a boolean value, and the input svInfo.flags being 8 could represent a specific flag or status update related to the satellite information. Without more information, it is difficult to provide a more detailed explanation.