Memory map

Physical address	name	description
0x00000000		internal RAM (0x2000 bytes)
0x00002000		DRAM (repeats to fill address space until 0x20000000)
0x40000000		memory-mapped SPI flash
0x50000000		mystery space (32-bit reads return the address(?))
0x7fff0000		Boot ROM alias
0x80000000		Internal RAM and DRAM alias (like 0x00000000-0x1fffffff)
0xb0000000	GCR	System Global Control Registers
0xb0000200	CLK	Clock Registers
0xb0001000	MC	Memory controller
0xb0002000	MAC1	Ethernet MAC 1
0xb0003000	MAC2	Ethernet MAC 2
0xb0005000	USB2	USB 2.0 device controller
0xb0006000	USB1	USB 1.1 device controller
0xb0007000	SDHC	SD Card host controller
0xb0018000	VCD	video capture device
0xb8000000	UART0	UART0
0xb8000100	UART1	UART1
0xb8000200	PECI	PECI controller
0xb8000300	GFXI	graphics interface
0xb8001000	TIMER	Timers
0xb8002000	AIC	Interrupt controller
0xb8003000	GPIO	GPIOs
0xb8004000	TACH0	tachometer 0
0xb8005000	TACH1	tachometer 1
0xb8006000	I2C0	I2C controllers
0xb8006100	I2C1
0xb8006200	I2C2
0xb8006300	I2C3
0xb8006400	I2C4
0xb8006500	I2C5
0xb8007000	PWM	Pulse-width modulation
0xb8008000	KCS	IPMI KCS and POST code monitor
0xb8009000	ADC	Analog-digital converter
0xb800b000	AES
0xc0000000		memory-mapped SPI flash
0xc6000000		internal RAM, 0x400 bytes
0xc8000000	FIU	boot SPI flash controller
0xc8001000	SHM	Shared memory(?)
0xffff0000		Boot ROM

Buses

• The ATEN kernel indicates that AHB starts at 0xb0000000 and APB starts at 0xb8000000.

ATEN kernel

The ATEN kernel installs the following mappings, to be used from the kernel and from userspace:

physical	virtual	size	description
0xb0000000	0xf0010000	0x00010000 (64k)	AHB, I/O devices
0xb0010000	0xf0020000	0x00010000 (64k)	VCD
0xb8000000	0xf0030000	0x00010000 (64k)	APB, more I/O devices
0x06400000	0xf0100000	0x02000000 (32M)	VCD memory, part of RAM

Note that the VCDMEM mapping is longer than it should be: 0x06400000 + 0x02000000 = 0x08400000. As a result, the first 4 MiB of RAM are also accessible to all userspace.

References

• Memory map: AMI, ATEN