In a stock environment, Slot B sits idle until an Over-The-Air (OTA) update installs background files onto it.
| Aspect | A/B for updates | A/B for multiboot | |--------|----------------|-------------------| | Safety | Update rollback safe | Switching slots retains both ROMs | | Storage | Requires ~2x space for system/vendor | Same limitation | | Multiboot ease | Not designed for it, but possible | Requires custom recovery or DSU | | Official support | Yes (since Android 7) | Only DSU (temporary GSI) | ab multiboot
While the OS itself takes up space, secondary ROMs require user-data partitions. You often need to allocate a significant portion of your internal storage (sometimes up to 40% depending on the setup). Step-by-Step Overview of a Slot-Based GSI Setup In a stock environment, Slot B sits idle
You do not have to delete factory recovery blocks or alter master GUID Partition Tables (GPT), preserving your device warranty and physical storage integrity. Step-by-Step Overview of a Slot-Based GSI Setup You
For 64-bit entry points, extensions to Multiboot2 allow addresses beyond 64 bits while maintaining backward compatibility. However, traditional Multiboot implementations transfer control in 32-bit mode, making 64-bit addresses only relevant for memory map information.