Difference between revisions of "CONFIG11 Registers"

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Line 8: Line 8:
 
|-
 
|-
 
| style="background: green" | Yes
 
| style="background: green" | Yes
−
| [[#PDN_SHAREDWRAM_32K_DATA|PDN_SHAREDWRAM_32K_DATA]]<0-7>
+
| [[#CFG11_SHAREDWRAM_32K_CODE|CFG11_SHAREDWRAM_32K_CODE]]<0-7>
 
| 0x10140000
 
| 0x10140000
 
| 1*8
 
| 1*8
Line 14: Line 14:
 
|-
 
|-
 
| style="background: green" | Yes
 
| style="background: green" | Yes
−
| [[#PDN_SHAREDWRAM_32K_CODE|PDN_SHAREDWRAM_32K_CODE]]<0-7>
+
| [[#CFG11_SHAREDWRAM_32K_DATA|CFG11_SHAREDWRAM_32K_DATA]]<0-7>
 
| 0x10140008
 
| 0x10140008
 
| 1*8
 
| 1*8
 
| Boot11, Process9, [[DSP Services]]
 
| Boot11, Process9, [[DSP Services]]
−
|-
+
|-style="border-top: double"
 
| style="background: green" | Yes
 
| style="background: green" | Yes
−
| ?
+
| [[#CFG11_NULLPAGE_CNT|CFG11_NULLPAGE_CNT]]
 
| 0x10140100
 
| 0x10140100
−
| 2
+
| 4
 
|  
 
|  
 
|-
 
|-
 
| style="background: green" | Yes
 
| style="background: green" | Yes
−
| ?
+
| [[#CFG11_FIQ_MASK|CFG11_FIQ_MASK]]
−
| 0x10140102
 
−
| 2
 
−
|
 
−
|-
 
−
| style="background: green" | Yes
 
−
| ARM11 interrupt related.
 
 
| 0x10140104
 
| 0x10140104
 
| 1
 
| 1
Line 38: Line 32:
 
|-
 
|-
 
| style="background: green" | Yes
 
| style="background: green" | Yes
−
| ?
+
| Debug related bitfield?
 +
Observed: 0b1100(N3DS)/0b0000(O3DS)
 
| 0x10140105
 
| 0x10140105
 
| 1
 
| 1
−
| Kernel11.
+
|  
 
|-
 
|-
 
| style="background: green" | Yes
 
| style="background: green" | Yes
−
| ?
+
| [[#CFG11_CDMA_CNT|CFG_CDMA_CNT]]
−
| 0x10140108
+
| 0x1014010C
 
| 2
 
| 2
 
| TwlBg
 
| TwlBg
 
|-
 
|-
 
| style="background: green" | Yes
 
| style="background: green" | Yes
−
| ?
+
| [[#CFG11_GPUPROT|CFG11_GPUPROT]]
−
| 0x1014010C
 
−
| 2
 
−
|
 
−
|-
 
−
| style="background: green" | Yes
 
−
| ?
 
 
| 0x10140140
 
| 0x10140140
−
| 2
+
| 4
−
|  
+
| Kernel11
 
|-
 
|-
 
| style="background: green" | Yes
 
| style="background: green" | Yes
−
| [[#PDN_WIFI_CNT|PDN_WIFI_CNT]]
+
| [[#CFG11_WIFICNT|CFG11_WIFICNT]]
 
| 0x10140180
 
| 0x10140180
 
| 1
 
| 1
−
| TwlBg
+
| TwlBg, [[NWM Services]]
 
|-
 
|-
 
| style="background: green" | Yes
 
| style="background: green" | Yes
−
| [[#PDN_SPI_CNT|PDN_SPI_CNT]]
+
| [[#CFG11_SPI_CNT|CFG11_SPI_CNT]]
 
| 0x101401C0
 
| 0x101401C0
−
| 4
+
| 2
 
| [[SPI Services]], TwlBg
 
| [[SPI Services]], TwlBg
−
|-
+
|-style="border-top: double"
 
| style="background: green" | Yes
 
| style="background: green" | Yes
 
| ?
 
| ?
 
| 0x10140200
 
| 0x10140200
 
| 4
 
| 4
−
|  
+
|
 
|-style="border-top: double"
 
|-style="border-top: double"
 
| style="background: red" | No
 
| style="background: red" | No
−
| Clock related?
+
| [[#CFG11_GPU_N3DS_CNT|CFG11_GPU_N3DS_CNT]]
 
| 0x10140400
 
| 0x10140400
 
| 1
 
| 1
−
| NewProcess11
+
| NewKernel11
 
|-
 
|-
 
| style="background: red" | No
 
| style="background: red" | No
−
| Clock related?
+
| [[#CFG11_CDMA_PERIPHERALS|CFG11_CDMA_PERIPHERALS]]
 
| 0x10140410
 
| 0x10140410
 
| 4
 
| 4
−
| NewProcess11
+
| NewKernel11
 
|-
 
|-
 
| style="background: red" | No
 
| style="background: red" | No
−
| [[#PDN_BOOTROM_OVERLAY_CNT|PDN_BOOTROM_OVERLAY_CNT]]
+
| [[#CFG11_BOOTROM_OVERLAY_CNT|CFG11_BOOTROM_OVERLAY_CNT]]
 
| 0x10140420
 
| 0x10140420
−
| 4
+
| 1
−
| NewProcess11
+
| NewKernel11
 
|-
 
|-
 
| style="background: red" | No
 
| style="background: red" | No
−
| [[#PDN_BOOTROM_OVERLAY_VAL|PDN_BOOTROM_OVERLAY_VAL]]
+
| [[#CFG11_BOOTROM_OVERLAY_VAL|CFG11_BOOTROM_OVERLAY_VAL]]
 
| 0x10140424
 
| 0x10140424
 
| 4
 
| 4
−
| NewProcess11
+
| NewKernel11
 
|-
 
|-
 
| style="background: red" | No
 
| style="background: red" | No
Line 107: Line 96:
 
| 0x10140428
 
| 0x10140428
 
| 4
 
| 4
−
|  
+
|
 
|-style="border-top: double"
 
|-style="border-top: double"
 
| style="background: green" | Yes
 
| style="background: green" | Yes
−
| [[#PDN_MPCORE_CFG|PDN_MPCORE_CFG]]
+
| [[#CFG11_SOCINFO|CFG11_SOCINFO]]
 
| 0x10140FFC
 
| 0x10140FFC
−
| 1
 
−
| Kernel11
 
−
|-style="border-top: double"
 
−
| style="background: green" | Yes
 
−
| PDN_GPU_STATUS?
 
−
| 0x10141000
 
−
| 4
 
−
| Kernel11, TwlBg
 
−
|-
 
−
| style="background: green" | Yes
 
−
| PDN_PTM_0
 
−
| 0x10141008
 
−
| 4
 
−
| [[PTM Services]], [[PDN Services]]
 
−
|-
 
−
| style="background: green" | Yes
 
−
| PDN_PTM_1
 
−
| 0x1014100C
 
−
| 4
 
−
| [[PTM Services]], TwlBg, [[PDN Services]]
 
−
|-style="border-top: double"
 
−
| style="background: green" | Yes
 
−
| [[#PDN_TWLMODE_0|PDN_TWLMODE_0]]
 
−
| 0x10141100
 
−
| 2
 
−
| TwlProcess9, TwlBg
 
−
|-
 
−
| style="background: green" | Yes
 
−
| [[#PDN_TWLMODE_1|PDN_TWLMODE_1]]
 
−
| 0x10141104
 
 
| 2
 
| 2
−
| TwlBg
 
−
|-
 
−
| style="background: green" | Yes
 
−
| [[#PDN_TWLMODE_2|PDN_TWLMODE_2]]
 
−
| 0x10141108
 
−
| 2
 
−
| TwlBg
 
−
|-
 
−
| style="background: green" | Yes
 
−
|
 
−
| 0x1014110A
 
−
| 2
 
−
| TwlBg
 
−
|-
 
−
| style="background: green" | Yes
 
−
| PDN_WIFI?
 
−
| 0x1014110C
 
−
| 1
 
−
|
 
−
|-
 
−
| style="background: green" | Yes
 
−
| ?
 
−
| 0x10141110
 
−
| 2
 
−
| TwlBg
 
−
|-
 
−
| style="background: green" | Yes
 
−
| ?
 
−
| 0x10141112
 
−
| 2
 
−
| TwlBg
 
−
|-
 
−
| style="background: green" | Yes
 
−
| [[#PDN_CODEC|PDN_CODEC_0]]
 
−
| 0x10141114
 
−
| 2
 
−
| [[CODEC Services]], TwlBg
 
−
|-
 
−
| style="background: green" | Yes
 
−
| [[#PDN_CODEC|PDN_CODEC_1]]
 
−
| 0x10141116
 
−
| 2
 
−
| [[CODEC Services]], TwlBg
 
−
|-
 
−
| style="background: green" | Yes
 
−
| ?
 
−
| 0x10141118
 
−
| 1
 
−
| TwlBg
 
−
|-
 
−
| style="background: green" | Yes
 
−
| ?
 
−
| 0x10141119
 
−
| 1
 
−
| TwlBg
 
−
|-
 
−
| style="background: green" | Yes
 
−
| ?
 
−
| 0x10141120
 
−
| 1
 
−
| TwlBg
 
−
|-
 
−
|-style="border-top: double"
 
−
| style="background: green" | Yes
 
−
| [[#PDN_GPU_CNT|PDN_GPU_CNT]]
 
−
| 0x10141200
 
−
| 4
 
−
| Boot11, Kernel11, [[PDN Services]]
 
−
|-
 
−
| style="background: green" | Yes
 
−
| [[#PDN_GPU_CNT2|PDN_GPU_CNT2]]
 
−
| 0x10141204
 
−
| 4
 
 
| Boot11, Kernel11
 
| Boot11, Kernel11
−
|-
 
−
| style="background: green" | Yes
 
−
| PDN_GPU_CNT3
 
−
| 0x10141210
 
−
| 2
 
−
| Kernel11, TwlBg
 
−
|-
 
−
| style="background: green" | Yes
 
−
| [[#PDN_CODEC_CNT|PDN_CODEC_CNT]]
 
−
| 0x10141220
 
−
| 1
 
−
| Boot11, TwlBg, [[PDN Services]]
 
−
|-
 
−
| style="background: green" | Yes
 
−
| [[#PDN_CAMERA_CNT|PDN_CAMERA_CNT]]
 
−
| 0x10141224
 
−
| 1
 
−
| [[PDN Services]]
 
−
|-
 
−
| style="background: green" | Yes
 
−
| PDN_DSP_CNT
 
−
| 0x10141230
 
−
| 1
 
−
| Process9, [[PDN Services]]
 
−
|-style="border-top: double"
 
−
| style="background: red" | No
 
−
| [[#PDN_MPCORE_CLKCNT|PDN_MPCORE_CLKCNT]]
 
−
| 0x10141300
 
−
| 2
 
−
| NewProcess11
 
−
|-
 
−
| style="background: red" | No
 
−
| [[#PDN_MPCORE_CNT|PDN_MPCORE_CNT]]
 
−
| 0x10141304
 
−
| 2
 
−
| NewProcess11
 
−
|-
 
−
| style="background: red" | No
 
−
| [[#PDN_MPCORE_BOOTCNT<0-3>|PDN_MPCORE_BOOTCNT]]<0-3>
 
−
| 0x10141310
 
−
| 1*4
 
−
| NewProcess11
 
 
|}
 
|}
  
−
== PDN_SHAREDWRAM_32K_DATA ==
+
== CFG11_SHAREDWRAM_32K_CODE ==
 
Used for mapping 32K chunks of shared WRAM for DSP data.
 
Used for mapping 32K chunks of shared WRAM for DSP data.
  
Line 269: Line 113:
 
|-
 
|-
 
| 0-1
 
| 0-1
−
| Master (0=ARM9?, 1=ARM11?, 2 or 3=DSP/data)
+
| Master (0=ARM9?, 1=ARM11?, 2 or 3=DSP/code)
 
|-
 
|-
 
| 2-4
 
| 2-4
Line 281: Line 125:
 
|}
 
|}
  
−
== PDN_SHAREDWRAM_32K_CODE ==
+
== CFG11_SHAREDWRAM_32K_DATA ==
 
Used for mapping 32K chunks of shared WRAM for DSP data.
 
Used for mapping 32K chunks of shared WRAM for DSP data.
  
Line 289: Line 133:
 
|-
 
|-
 
| 0-1
 
| 0-1
−
| Master (0=ARM9?, 1=ARM11?, 2 or 3=DSP/code)
+
| Master (0=ARM9?, 1=ARM11?, 2 or 3=DSP/data)
 
|-
 
|-
 
| 2-4
 
| 2-4
Line 301: Line 145:
 
|}
 
|}
  
−
== PDN_SPI_CNT ==
+
== CFG11_NULLPAGE_CNT ==
 
{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
 
!  Bit
 
!  Bit
Line 307: Line 151:
 
|-
 
|-
 
| 0
 
| 0
−
| Enable [[SPI Registers]] 0x10160000.
+
| Trap all ''data'' accesses to physmem addresses 0x0000 to 0x1000
−
|-
 
−
| 1
 
−
| Enable [[SPI Registers]] 0x10142000.
 
 
|-
 
|-
−
| 2
+
| 16
−
| Enable [[SPI Registers]] 0x10143800.
+
| Unknown
 
|}
 
|}
  
−
== PDN_BOOTROM_OVERLAY_CNT ==
+
The reset value of this register is 0x10000.
−
Bit0: Enable bootrom overlay functionality.
+
 
 +
== CFG11_FIQ_MASK ==
 +
Write bit N to mask FIQ interrutps on core N? (judging from what Kernel11 does -- it only ever configures FIQ for core1)
  
−
== PDN_BOOTROM_OVERLAY_VAL ==
+
Reset value: 0xF
−
The 32-bit value to overlay data-reads to bootrom with. See [[#PDN_MPCORE_BOOTCNT|PDN_MPCORE_BOOTCNT]].
 
  
−
== PDN_MPCORE_CFG ==
+
== CFG11_CDMA_CNT ==
−
Read-only register.
+
Write 1 to enable, to disable.
  
 
{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
Line 330: Line 172:
 
|-
 
|-
 
| 0
 
| 0
−
| Always set to 1 on both Old3DS and New3DS.
+
| Enable Microphone DMA (CDMA 0x00)
 
|-
 
|-
 
| 1
 
| 1
−
| 3rd ARM11 MPCore available maybe?
+
| Enable NTRCARD DMA on Arm11 side (CDMA 0x01)
 +
|-
 +
| 2-4
 +
| ?
 
|-
 
|-
−
| 2
+
| 5
−
| 4th ARM11 MPCore available maybe?
+
| WiFi. Enabled during kernel init since 11.4.
 
|}
 
|}
  
−
== PDN_MPCORE_CLKCNT ==
+
== CFG11_SPI_CNT ==
−
This is used for configuring the New3DS ARM11 CPU clock-rate(unknown if writing here does anything on Old3DS).
+
When the corresponding bit is 0, the bus has to be accessed using the DS SPI registers. Otherwise it has to be accessed using the 3DS SPI registers.
−
 
 
 
{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
−
!  Bits
+
!  Bit
 
!  Description
 
!  Description
 
|-
 
|-
 
| 0
 
| 0
−
| Always(?) set to 1 on both Old3DS and New3DS.
+
| Enable [[SPI Registers]] 0x10160800.
 +
|-
 +
| 1
 +
| Enable [[SPI Registers]] 0x10142800.
 +
|-
 +
| 2
 +
| Enable [[SPI Registers]] 0x10143800.
 
|}
 
|}
  
−
[[SVC#KernelSetState|svcKernelSetState]] type10, only implemented on New3DS, uses this register. That code writes the following values to this register, depending on the input Param0 bit0 state, and the state of PDN_MPCORE_CFG:
+
== CFG11_GPU_N3DS_CNT ==
 
{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
−
!  Register value
+
!  Bit
−
!  Higher-clockrate bit set in svcKernelSetState Param0
 
−
!  PDN_MPCORE_CFG bit2 set
 
−
!  MPCore timer/watchdog prescaler value, prior to subtracting it by 0x1 when writing it into hw/state
 
−
!  Clock-rate multiplier
 
 
!  Description
 
!  Description
 
|-
 
|-
−
| 0x01
+
| 0
−
| No
+
| Enable N3DS mode? (enables access to the extra N3DS FCRAM banks, etc.)
−
| Yes
 
−
| 0x01
 
−
| 1x
 
−
| 268MHz
 
 
|-
 
|-
−
| 0x02
+
| 1
−
| No
+
| Texture related? (observing texture glitches when disabling this bit)
−
| No
+
|}
−
| 0x01
+
 
−
| 1x
+
== CFG11_CDMA_PERIPHERALS ==
−
| 268MHz
+
{| class="wikitable" border="1"
 +
!  Bit
 +
!  Description
 
|-
 
|-
−
| 0x05
+
| 0-17
−
| Yes
+
| CDMA Peripheral 0x00-0x11 data request target (0=Old CDMA, 1=New CDMA)
−
| Yes
 
−
| 0x03
 
−
| 3x
 
−
| 804MHz
 
 
|-
 
|-
−
| 0x03
+
| 18-31
−
| Yes
+
| Unused
−
| No
 
−
| 0x02
 
−
| 2x
 
−
| 536MHz (tested on New3DS)
 
 
|}
 
|}
  
−
Note that the above PDN_MPCORE_CFG bit is 1 on New3DS, and 0 on Old3DS. Since this SVC is only available with the New3DS ARM11-kernel, the only additional available clock-rate is 804MHz when running on New3DS(with official kernel code).
+
== CFG11_BOOTROM_OVERLAY_CNT ==
 +
Bit0: Enable bootrom overlay functionality.
 +
 
 +
== CFG11_BOOTROM_OVERLAY_VAL ==
 +
The 32-bit value to overlay data-reads to bootrom with. See [[PDN Registers#PDN_LGR_CPU_CNT<0-3>|PDN_LGR_CPU_CNT]]<0-3>.
 +
 
 +
== CFG11_SOCINFO ==
 +
Read-only register. Identifies the maximum mode-switching capabilities of the SoC.
 +
 
 +
* CTR: O3DS
 +
* LGR1: N3DS prototype, 4 cores (orginally 2), up to 535MHz, no L2C (see below)
 +
* LGR2: retail N3DS, 4 cores, up to 804MHz, has L2C
  
−
The following register value(s) were tested on New3DS by patching the kernel:
+
Kernel code suggests that devices that support LGR1 but not LGR2 only had 2 cores. All cores (the number of which can be read from MPCORE SCU registers) are usable in LGR1 mode.
−
* 0x00: Entire system hangs.
 
−
* 0x02: Entire system hangs.
 
−
* 0x03: ARM11 runs at 536MHz.
 
−
* 0x04: Entire system hangs.
 
−
* 0x06: Entire system hangs.
 
−
* 0x07: Same result as 0x05.
 
−
* 0x0D: Same result as 0x05.
 
−
* 0x0F: Same result as 0x05.
 
  
−
== PDN_MPCORE_CNT ==
 
 
{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
 
!  Bits
 
!  Bits
 
!  Description
 
!  Description
 +
!  Used by
 
|-
 
|-
 
| 0
 
| 0
−
| Power on 3rd ARM11 MPCore maybe?
+
| CTR mode (1 on all 3DSes)
 +
| Boot11
 +
|-
 +
| 1
 +
| LGR1 (1 on all N3DSes, orginally 2 cores, and 2x clockrate)
 +
| Kernel11
 
|-
 
|-
−
| 8
+
| 2
−
| Power on 4th ARM11 MPCore maybe?
+
| LGR2 (1 on all released N3DSes, 4 cores and 3x clockrate)
 +
| Kernel11
 
|}
 
|}
  
−
== PDN_MPCORE_BOOTCNT<0-3> ==
+
==CFG11_GPUPROT==
 
{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
 +
!  Old3DS
 
!  Bits
 
!  Bits
 
!  Description
 
!  Description
 
|-
 
|-
−
| 0
+
| style="background: green" | Yes
−
| Enable bootrom instruction overlay, maybe? This bit is only writable for core2 and core3.
+
| 3-0
 +
| Old FCRAM DMA cutoff size, 0 = no protection.
 +
|-
 +
| style="background: red" | No
 +
| 7-4
 +
| New FCRAM DMA cutoff size, 0 = no protection.
 
|-
 
|-
−
| 1
+
| style="background: green" | Yes
−
| Enable bootrom data overlay. This bit is only writable for core2 and core3.
+
| 8
 +
| AXIWRAM protection, 0 = accessible.
 
|-
 
|-
−
| 4
+
| style="background: red" | No
−
| Has core booted maybe?
+
| 10-9
 +
| QTM DMA cutoff size
 
|-
 
|-
−
| 5
+
| style="background: green" | Yes
−
| Always 1?
+
| 31-11
 +
| Zeroes
 
|}
 
|}
  
−
The normal ARM11 bootrom checks cpuid and hangs if cpuid >= 2. This is a problem when booting the 2 additional New3DS ARM11 MPCores. NewKernel11 solves this by using a hardware feature to overlay the bootrom with a configurable branch to a kernel function. This overlay feature was added with the New3DS.
+
For the old FCRAM DMA cutoff, it protects starting from 0x28000000-(0x800000*x) until end of FCRAM. There is no way to protect the first 0x800000-bytes.
  
−
Bit1 in register above enables a bootrom data-override for physical addresses 0xFFFF0000-0xFFFF1000 and 0x10000-0x11000. All _data reads_ made to those regions now read the 32-bit value provided in [[#PDN_BOOTROM_OVERLAY_VAL|PDN_BOOTROM_OVERLAY_VAL]].
+
For the new FCRAM DMA cutoff, it protects starting from 0x30000000-(0x800000*x) until end of FCRAM. When the old FCRAM cutoff is set to non-zero, the first 0x800000-bytes bytes of new FCRAM are protected.
  
−
Bit0 enables a bootrom instruction-overlay which means that _instruction reads_ made to the bootrom region are overridden. We have not been able to dump what instructions are actually placed at bootrom by this switch (because reading the area only yields data-reads). Jumping randomly into the 0xFFFF0000-0xFFFF1000 region works fine and jumps to the value provided by the data overlay [[#PDN_BOOTROM_OVERLAY_VAL|PDN_BOOTROM_OVERLAY_VAL]]. Thus we may predict that the entire bootrom region is filled by:
+
On New3DS the old+new FCRAM cutoff can be used at the same time, however this isn't done officially.
−
ldr pc, [pc]
 
  
−
Or equivalent. However, jumping to some high addresses such as 0xFFFF0FF0+ will crash the core. This may be explained by prefetching in the ARM pipeline, and might help us identify what instructions are placed by the instruction-overlay.
+
For the QTM DMA cutoff, it protects starting from 0x1F400000-(0x100000*x) until end of QTM mem.
  
−
==PDN_WIFI_CNT==
+
On cold boot this reg is set to 0.
−
Bit0: Enable wifi.
 
  
−
==PDN_TWLMODE_0==
+
When this register is set to value 0, the GPU can access the entire FCRAM, AXIWRAM, and on New3DS all QTM-mem.
−
Observed 0x8001 when running under TWL_ and AGB_FIRM, 0 NATIVE_FIRM.
 
  
−
This address is poked from ARM7 to signal that it has booted and begun executing code. The ARM7-mode address for this register is 0x4700000.
+
[[SVC|Initialized]] during kernel boot, and used with [[SVC]] 0x59 which was implemented with [[11.3.0-36|v11.3]].
  
−
The very last 3DS-mode register poke the [[FIRM|TWL_FIRM]] Process9 does before it gets switched into TWL-mode, is writing 0x8000 to this register. Before writing this register, TWL Process9 waits for ARM7 to change the value of this register. The Process9 code for this runs from ITCM, since switching into TWL-mode includes remapping all ARM9 physical memory.
+
==CFG11_WIFICNT==
−
 
+
{| class="wikitable" border="1"
−
Writing 0x8000 to here from the ARM9 with NATIVE_FIRM running doesn't seem to do anything, other reg-pokes likely need done first.
+
!  Old3DS
−
 
+
!  Bits
−
==PDN_TWLMODE_1==
+
!  Description
−
Observed 0x8000 when running under TWL_FIRM, 0 NATIVE_FIRM.
+
|-
−
 
+
| style="background: green" | Yes
−
==PDN_GPU_CNT==
+
| 0
−
This one seems to control the LCD/GPU/Backlight.
+
| Enable wifi subsystem
−
 
+
|}
−
Bit0: Enable GPU registers at 0x10400000+.
 
−
Bit16: Turn on LCD backlight.
 
−
 
 
−
==PDN_GPU_CNT2==
 
−
Bit0: Power on GPU?
 
−
 
 
−
==PDN_GPU_CNT3==
 
−
Bit1: FCRAM access from ARM11? Clearing this bit in 3DS-mode causes the ARM11 and ARM9 to hang/crash.
 
−
 
 
−
==PDN_CODEC==
 
−
The following is the only time the ARM11 CODEC module uses any 0x1EC41XXX registers. In one case CODEC module clears bit1 in register 0x1EC41114, in the other case CODEC module sets bit1 in registers 0x1EC41114 and 0x1EC41116.
 
−
 
 
−
==PDN_CODEC_CNT==
 
−
This is the power register used for the [[PDN_Services|PDN]] CODEC service.
 
−
 
 
−
bit0 = unknown, bit1 = turn on/off DSP, rest = always 0.
 
−
 
 
−
==PDN_CAMERA_CNT==
 
−
This is the power register used for the [[PDN_Services|PDN]] camera service.
 
−
 
 
−
bit0 = unknown, bit1 = turn on/off cameras, rest = always 0.
 

Latest revision as of 00:56, 27 January 2021

Registers[edit]

Old3DS Name Address Width Used by
Yes CFG11_SHAREDWRAM_32K_CODE<0-7> 0x10140000 1*8 Boot11, Process9, DSP Services
Yes CFG11_SHAREDWRAM_32K_DATA<0-7> 0x10140008 1*8 Boot11, Process9, DSP Services
Yes CFG11_NULLPAGE_CNT 0x10140100 4
Yes CFG11_FIQ_MASK 0x10140104 1 Kernel11.
Yes Debug related bitfield?

Observed: 0b1100(N3DS)/0b0000(O3DS)

0x10140105 1
Yes CFG_CDMA_CNT 0x1014010C 2 TwlBg
Yes CFG11_GPUPROT 0x10140140 4 Kernel11
Yes CFG11_WIFICNT 0x10140180 1 TwlBg, NWM Services
Yes CFG11_SPI_CNT 0x101401C0 2 SPI Services, TwlBg
Yes ? 0x10140200 4
No CFG11_GPU_N3DS_CNT 0x10140400 1 NewKernel11
No CFG11_CDMA_PERIPHERALS 0x10140410 4 NewKernel11
No CFG11_BOOTROM_OVERLAY_CNT 0x10140420 1 NewKernel11
No CFG11_BOOTROM_OVERLAY_VAL 0x10140424 4 NewKernel11
No ? 0x10140428 4
Yes CFG11_SOCINFO 0x10140FFC 2 Boot11, Kernel11

CFG11_SHAREDWRAM_32K_CODE[edit]

Used for mapping 32K chunks of shared WRAM for DSP data.

Bits Description
0-1 Master (0=ARM9?, 1=ARM11?, 2 or 3=DSP/code)
2-4 Offset (0..7) (slot 0..7) (LSB of address in 32Kbyte units)
5-6 Not used (0)
7 Enable (0=Disable, 1=Enable)

CFG11_SHAREDWRAM_32K_DATA[edit]

Used for mapping 32K chunks of shared WRAM for DSP data.

Bits Description
0-1 Master (0=ARM9?, 1=ARM11?, 2 or 3=DSP/data)
2-4 Offset (0..7) (slot 0..7) (LSB of address in 32Kbyte units)
5-6 Not used (0)
7 Enable (0=Disable, 1=Enable)

CFG11_NULLPAGE_CNT[edit]

Bit Description
0 Trap all data accesses to physmem addresses 0x0000 to 0x1000
16 Unknown

The reset value of this register is 0x10000.

CFG11_FIQ_MASK[edit]

Write bit N to mask FIQ interrutps on core N? (judging from what Kernel11 does -- it only ever configures FIQ for core1)

Reset value: 0xF

CFG11_CDMA_CNT[edit]

Write 1 to enable, to disable.

Bits Description
0 Enable Microphone DMA (CDMA 0x00)
1 Enable NTRCARD DMA on Arm11 side (CDMA 0x01)
2-4 ?
5 WiFi. Enabled during kernel init since 11.4.

CFG11_SPI_CNT[edit]

When the corresponding bit is 0, the bus has to be accessed using the DS SPI registers. Otherwise it has to be accessed using the 3DS SPI registers.

Bit Description
0 Enable SPI Registers 0x10160800.
1 Enable SPI Registers 0x10142800.
2 Enable SPI Registers 0x10143800.

CFG11_GPU_N3DS_CNT[edit]

Bit Description
0 Enable N3DS mode? (enables access to the extra N3DS FCRAM banks, etc.)
1 Texture related? (observing texture glitches when disabling this bit)

CFG11_CDMA_PERIPHERALS[edit]

Bit Description
0-17 CDMA Peripheral 0x00-0x11 data request target (0=Old CDMA, 1=New CDMA)
18-31 Unused

CFG11_BOOTROM_OVERLAY_CNT[edit]

Bit0: Enable bootrom overlay functionality.

CFG11_BOOTROM_OVERLAY_VAL[edit]

The 32-bit value to overlay data-reads to bootrom with. See PDN_LGR_CPU_CNT<0-3>.

CFG11_SOCINFO[edit]

Read-only register. Identifies the maximum mode-switching capabilities of the SoC.

  • CTR: O3DS
  • LGR1: N3DS prototype, 4 cores (orginally 2), up to 535MHz, no L2C (see below)
  • LGR2: retail N3DS, 4 cores, up to 804MHz, has L2C

Kernel code suggests that devices that support LGR1 but not LGR2 only had 2 cores. All cores (the number of which can be read from MPCORE SCU registers) are usable in LGR1 mode.

Bits Description Used by
0 CTR mode (1 on all 3DSes) Boot11
1 LGR1 (1 on all N3DSes, orginally 2 cores, and 2x clockrate) Kernel11
2 LGR2 (1 on all released N3DSes, 4 cores and 3x clockrate) Kernel11

CFG11_GPUPROT[edit]

Old3DS Bits Description
Yes 3-0 Old FCRAM DMA cutoff size, 0 = no protection.
No 7-4 New FCRAM DMA cutoff size, 0 = no protection.
Yes 8 AXIWRAM protection, 0 = accessible.
No 10-9 QTM DMA cutoff size
Yes 31-11 Zeroes

For the old FCRAM DMA cutoff, it protects starting from 0x28000000-(0x800000*x) until end of FCRAM. There is no way to protect the first 0x800000-bytes.

For the new FCRAM DMA cutoff, it protects starting from 0x30000000-(0x800000*x) until end of FCRAM. When the old FCRAM cutoff is set to non-zero, the first 0x800000-bytes bytes of new FCRAM are protected.

On New3DS the old+new FCRAM cutoff can be used at the same time, however this isn't done officially.

For the QTM DMA cutoff, it protects starting from 0x1F400000-(0x100000*x) until end of QTM mem.

On cold boot this reg is set to 0.

When this register is set to value 0, the GPU can access the entire FCRAM, AXIWRAM, and on New3DS all QTM-mem.

Initialized during kernel boot, and used with SVC 0x59 which was implemented with v11.3.

CFG11_WIFICNT[edit]

Old3DS Bits Description
Yes 0 Enable wifi subsystem
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