A64/Memory map

The full memory map can be found in the official A64 user manual, this table here just shows deviations from that (as found by experiments on the SoC) or annotations.

Memory Map

Start	End	Size	Name	Remarks
0x00000000	0x0000FFFF	64KiB	BROM	Only a small part is used (0x0000 ~ 0x8080)
0x00010000	0x00017FFF	32KiB	SRAM A1	The Boot ROM loads the first user provided code (usually boot0 or U-Boot's SPL, loaded from eMMC, SD card, SPI flash or FEL) into this region and executes it.
0x00018000	0x00032FFF	108KiB	SRAM C	Contiguous with the SRAM A1. Following the manual this region should be larger (160KiB, 0x18000-0x3FFFF). Also this region doesn't work reliably when AHB1 is clocked at 200MHz but well when clocked at 100MHz (which is the frequency used by FEL mode).
0x00033000	0x0003FFFF	52KiB	RAZ/WI	The manual claims this is part of SRAM C, but this region is always read as zero with writes ignored.
0x00040000	0x00043FFF	16KiB	arisc excp	ARISC exception vectors: sparsely implemented, only one 32-bit word at each 256 Byte boundary, followed by a hardcoded OpenRISC NOP (0x15000000).
0x00044000	0x00053FFF	64KiB	SRAM A2	This region is tightly coupled to the ARISC core, so OpenRISC code is normally loaded here.
Peripherals
0x01C28000	0x01C283FF	1KiB	UART 0	This is the UART used by the firmware (boot0, ATF) and U-Boot.
Memory
0x40000000	0xFFFFFFFF	3GiB	SDRAM	DRAM space, up to 3GiB.