Checking for AB Partition Slot Support

But I want without fastboot command My usecase is the bootloader need to check the currect active slot and set the proper suffix How can I do

If the bootloader implements fastboot, it should support the command set_active slot> that sets the current active slot to the given slot (this

fastboot set active slot But I want without fastboot command My usecase is the bootloader need to check the currect active slot and set the proper suffix How can I do

fastboot_ error_ failed to identify current slot This command provides information about the active slot from which the device is currently booting user $ fastboot getvar current-slot Dump