Hardware/Memory Controller

These registers contain various settings relevant to configuring system memory (and perhaps some aspects of the AHB). boot1 seems responsible for initially configuring a lot of these registers during the boot process - most likely for setting the DDR memory timings. In general, IOS (including BC/MIOS) seem to interact with these early when booting. The IOS[58] kernel also exposes syscall 0x57 for writing to this register space, which only appears to be used by the STM module.

Memory Controller
Access
Broadway	???
Starlet	Full
Registers
Base	0x0d8b4200
Length	0xcc (?)
Access size	16 bits
Byte order	Big Endian

Some of these register banks (SEQ/BIST/PERF) are not directly mapped into memory, but are instead accessed using a corresponding pair of registers:

• For the DDR SEQ registers, MEM_SEQ_ADDR and MEM_SEQ_DATA
• For the DDR BIST, MEM_BIST_ADDR and MEM_BIST_DATA

Although the memory controller registers are actually mapped and available to ARM starting at 0x0d8b4200, some [all?] of the indirect accesses are performed starting with another pair in the Memory Interface registers.

Note: MEM_ARB_EXADDR and MEM_ARB_EXCMD at the end of the register space may also indicate an additional set of indirectly-accessible registers.

Memory Controller Base Registers
Address	Bits	Name	Description
0x0d8b4200	16	MEM_COMPAT
0x0d8b4202	16	MEM_PROT_REG
0x0d8b4204	16	MEM_PROT_SPL	SPL (?) protection enabled/disable
0x0d8b4206	16	MEM_PROT_SPL_BASE	SPL (?) protection base address
0x0d8b4208	16	MEM_PROT_SPL_END	SPL (?) protection end address
0x0d8b420a	16	MEM_PROT_DDR	DDR protection enable/disable
0x0d8b420c	16	MEM_PROT_DDR_BASE	DDR protection base address
0x0d8b420e	16	MEM_PROT_DDR_END	DDR protection end address
0x0d8b4210	16	MEM_COLSEL
0x0d8b4212	16	MEM_ROWSEL
0x0d8b4214	16	MEM_BANKSEL
0x0d8b4216	16	MEM_RANKSEL
0x0d8b4218	16	MEM_COLMSK
0x0d8b421a	16	MEM_ROWMSK
0x0d8b421c	16	MEM_BANKMSK
0x0d8b421e	16	MEM_PROT_SPL_ERR
0x0d8b4220	16	MEM_PROT_DDR_ERR
0x0d8b4222	16	MEM_PROT_SPL_MSK
0x0d8b4224	16	MEM_PROT_DDR_MSK
0x0d8b4226	16	MEM_RFSH
0x0d8b4228	16	MEM_AHMFLUSH	AHB flush request
0x0d8b422a	16	MEM_AHMFLUSH_ACK	AHB flush request acknowledgment
0x0d8b4268	16	MEM_SEQRD_HWM
0x0d8b426a	16	MEM_SEQWR_HWM
0x0d8b426c	16	MEM_SEQCMD_HWM
0x0d8b426e	16	MEM_CPUAHM_WR_T
0x0d8b4270	16	MEM_DMAAHM_WR_T
0x0d8b4272	16	MEM_DMAAHM0_WR_T
0x0d8b4274	16	MEM_DMAAHM1_WR_T
0x0d8b4276	16	MEM_PI_WR_T
0x0d8b4278	16	MEM_PE_WR_T
0x0d8b427a	16	MEM_IO_WR_T
0x0d8b427c	16	MEM_DSP_WR_T
0x0d8b427e	16	MEM_ACC_WR_T
0x0d8b4280	16	MEM_ARB_MAXWR
0x0d8b4282	16	MEM_ARB_MINRD
0x0d8b4284	16	MEM_PROF_CPUAHM
0x0d8b4286	16	MEM_PROF_CPUAHM0
0x0d8b4288	16	MEM_PROF_DMAAHM
0x0d8b428a	16	MEM_PROF_DMAAHM0
0x0d8b428c	16	MEM_PROF_DMAAHM1
0x0d8b428e	16	MEM_PROF_PI
0x0d8b4290	16	MEM_PROF_VI
0x0d8b4292	16	MEM_PROF_IO
0x0d8b4294	16	MEM_PROF_DSP
0x0d8b4296	16	MEM_PROF_TC
0x0d8b4298	16	MEM_PROF_CP
0x0d8b429a	16	MEM_PROF_ACC
0x0d8b429c	16	MEM_RDPR_CPUAHM
0x0d8b429e	16	MEM_RDPR_CPUAHM0
0x0d8b42a0	16	MEM_RDPR_DMAAHM
0x0d8b42a2	16	MEM_RDPR_DMAAHM0
0x0d8b42a4	16	MEM_RDPR_DMAAHM1
0x0d8b42a6	16	MEM_RDPR_PI
0x0d8b42a8	16	MEM_RDPR_VI
0x0d8b42aa	16	MEM_RDPR_IO
0x0d8b42ac	16	MEM_RDPR_DSP
0x0d8b42ae	16	MEM_RDPR_TC
0x0d8b42b0	16	MEM_RDPR_CP
0x0d8b42b2	16	MEM_RDPR_ACC
0x0d8b42b4	16	MEM_ARB_MAXRD
0x0d8b42b6	16	MEM_ARB_MISC
0x0d8b42b8	16	MEM_ARAM_EMUL	"ARAM Emulation" (?)
0x0d8b42ba	16	MEM_WRMUX
0x0d8b42bc	16	MEM_PERF
0x0d8b42be	16	MEM_PERF_READ
0x0d8b42c0	16	MEM_ARB_EXADDR
0x0d8b42c2	16	MEM_ARB_EXCMD
0x0d8b42c4	16	MEM_SEQ_DATA	Data from read (or for pending write) on DDR SEQ
0x0d8b42c6	16	MEM_SEQ_ADDR	Offset for access on DDR SEQ register space
0x0d8b42c8	16	MEM_BIST_DATA	Data from read (or for pending write) on DDR BIST
0x0d8b42ca	16	MEM_BIST_ADDR	Offset for access on DDR BIST register space

DDR SEQ Register Space

SEQ
Access
Broadway	???
Starlet	Full
Registers
Base	N/A
Length	???
Access size	16 bits
Byte order	Big Endian

Note: These registers are NOT mapped into memory.

DDR SEQ Registers
Address	Bits	Name	Description

DDR BIST Register Space

BIST
Access
Broadway	???
Starlet	Full
Registers
Base	N/A
Length	???
Access size	16 bits
Byte order	Big Endian

Note: These registers are NOT mapped into memory.

DDR BIST Registers
Address	Bits	Name	Description

DDR PERF Register Space

PERF
Access
Broadway	???
Starlet	Full
Registers
Base	N/A
Length	???
Access size	16 bits
Byte order	Big Endian

Note: These registers are NOT mapped into memory.

DDR PERF Registers
Address	Bits	Name	Description