Every document for ATSAMA5D225-CD1G states that this SiP has 2 SDMMC interfaces, but only SDMMC1 is available in Harmony3 Configurator.
I can see that only the SDMMC0 memory segment is present, but the SDMMC0 instance, interrupts lines 31 and 71 are not present.
I have already verified, that supplementing missing peripherals (SDMMC0 and FLEXCOM2) results in proper work of these interfaces. In my free time, I will try to make a pull request with these changes.
Every document for ATSAMA5D225-CD1G states that this SiP has 2 SDMMC interfaces, but only SDMMC1 is available in Harmony3 Configurator. I can see that only the SDMMC0 memory segment is present, but the SDMMC0 instance, interrupts lines 31 and 71 are not present.