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Identification

Inet U70B
Manufacturer	iNet
Dimensions	193 mm x 110mm x 11mm
Specifications
SoC	A33 @ 1.2Ghz
DRAM	512MiB DDR3 @ 480MHz
NAND	8GB
Power	DC 5V @ 3A, 2000mAh 3.7V Li-Ion battery
Features
LCD	1024x600 7"
Touchscreen	Multi-finger capacitive (Silead GSL1686)
Audio	3.5mm headphone/microphone plug, internal speaker, internal microphone
Network	WiFi 802.11 b/g/n (Realtek 8723CS)
Storage	µSD
USB	1 USB2.0 OTG
Camera	Header (unpopulated in device on hand)
Other	Accelerometer (Bosch BMA250)

This white-label board may appear in tablets by other brands. One tablet using this board is the "Nimbus 17 V1". On the back of the tablet, the following is printed:

cm2
NIMBUS performance
2AM4S-NIMBUS17V1
[serial number sticker]

The PCB has the following silkscreened on it:

INET-U70B-REV01
Zeng-gc 2016-11-30

In android, under Settings->About Tablet, you will find:

Model Number: Nimbus 17 V1
Build Number: Nimbus_20171110_V001

More android build info:

[ro.build.characteristics]: [tablet]
[ro.build.date.utc]: [1510293882]
[ro.build.date]: [Fri Nov 10 14:04:42 CST 2017]
[ro.build.description]: [astar_ibt_8723bs-eng 4.4.2 KVT49L 20171110 test-keys]
[ro.build.display.id]: [Nimbus_20171110_V001]
[ro.build.fingerprint]: [iNet/astar_ibt_8723bs/astar-ibt-8723bs:4.4.2/KVT49L/20171110:eng/test-keys]
[ro.build.host]: [inet-server01]
[ro.build.id]: [KVT49L]
[ro.build.product]: [astar-ibt-8723bs]
[ro.build.tags]: [test-keys]
[ro.build.type]: [eng]
[ro.build.user]: [inet-soft03]
[ro.build.version.codename]: [REL]
[ro.build.version.incremental]: [20171110]
[ro.build.version.release]: [4.4.2]
[ro.build.version.sdk]: [19]
[ro.product.board]: [exdroid]
[ro.product.brand]: [Nimbus]
[ro.product.device]: [astar-ibt-8723bs]
[ro.product.firmware]: [2.1_20160317]
[ro.product.manufacturer]: [unknown]
[ro.product.model]: [Nimbus 17 V1]
[ro.product.model_mtp]: [Nimbus_17_V1]
[ro.product.name]: [astar_ibt_8723bs]
[ro.reversion.aw_sdk_tag]: [exdroid4.4.2_r2-a33-v2.1]
[ro.rock.gota.brand]: [unknown]
[ro.rock.gota.model]: [Nimbus 17 V1]
[ro.rock.gota.model_mtp]: [Nimbus_17_V1]
[ro.rock.gota.version]: [Nimbus_20171110_V001_1510293882]

Sunxi support

Current status

Give a brief overview of the current status of support under sunxi here.

Manual build

You can build things for yourself by following our Manual build howto and by choosing from the configurations available below.

U-Boot

Mainline U-Boot

Use the MANUFACTURER_DEVICE build target.

Linux Kernel

Mainline kernel

Use the FAMILY-CHIP-DEVICE.dtb device-tree binary.

Tips, Tricks, Caveats

Add MANUFACTURER DEVICE specific tips, tricks, Caveats and nice to have changes here.

Adding a serial port (voids warranty)

DEVICE UART pads

See the UART howto. A microSD breakout board is recommended for UART access. This does not require disassembly.

Device disassembly

Pop off the back cover by releasing the clips around the edges. The speaker is loosely glued to the back cover, so you will need to gently remove it before fully removing the back cover.

Locating the UART

There are UART TX and RX pads near the SD card slot. You can solder wires onto these pads, but since they are the same pins (PF2 and PF4) used for the microSD card, there is no advantage over using a microSD breakout board to access them.

Pictures

Take some pictures of your device, upload them, and add them here. DO NOT UPLOAD PICTURES WHICH YOU PLUCKED OFF THE INTERNET.

Schematic

No schematic is available, but here is some hardware info gathered from the stock android build:

GPIO mapping:

GPIOs 0-383, platform/sunxi-pinctrl, sunxi-pinctrl:
 gpio-36  (cd                  ) in  lo
 gpio-225 (?                   ) out lo
 gpio-232 (otg_id              ) in  hi
 gpio-233 (?                   ) out lo

I2C mapping:

root@astar-ibt-8723bs:/ # grep . /sys/bus/i2c/devices/*-0*/name
/sys/bus/i2c/devices/0-0040/name:gslX680
/sys/bus/i2c/devices/1-0018/name:bma250

Pinctrl mapping:

root@astar-ibt-8723bs:/ # cat /sys/kernel/debug/pinctrl/pinctrl-handles
Requested pin control handlers their pinmux maps:
device: sunxi-pinctrl current state: none
device: axp-pinctrl current state: none
device: twi0 current state: default
  state: default
    type: MUX_GROUP controller sunxi-pinctrl group: PH2 (103) function: twi0 (26)
    type: MUX_GROUP controller sunxi-pinctrl group: PH3 (104) function: twi0 (26)
device: twi1 current state: default
  state: default
    type: MUX_GROUP controller sunxi-pinctrl group: PH4 (105) function: twi1 (27)
    type: MUX_GROUP controller sunxi-pinctrl group: PH5 (106) function: twi1 (27)
device: twi2 current state: default
  state: default
    type: MUX_GROUP controller sunxi-pinctrl group: PE12 (75) function: twi2 (20)
    type: MUX_GROUP controller sunxi-pinctrl group: PE13 (76) function: twi2 (20)
device: uart0 current state: default
  state: default
    type: MUX_GROUP controller sunxi-pinctrl group: PF2 (83) function: uart0 (8)
    type: CONFIGS_GROUP controller sunxi-pinctrl group PF2 (83) 00010002
    type: MUX_GROUP controller sunxi-pinctrl group: PF4 (85) function: uart0 (8)
    type: CONFIGS_GROUP controller sunxi-pinctrl group PF4 (85) 00010002
device: uart1 current state: default
  state: default
    type: MUX_GROUP controller sunxi-pinctrl group: PG6 (93) function: uart1 (17)
    type: CONFIGS_GROUP controller sunxi-pinctrl group PG6 (93) 00010002
    type: MUX_GROUP controller sunxi-pinctrl group: PG7 (94) function: uart1 (17)
    type: CONFIGS_GROUP controller sunxi-pinctrl group PG7 (94) 00010002
    type: MUX_GROUP controller sunxi-pinctrl group: PG8 (95) function: uart1 (17)
    type: CONFIGS_GROUP controller sunxi-pinctrl group PG8 (95) 00010002
    type: MUX_GROUP controller sunxi-pinctrl group: PG9 (96) function: uart1 (17)
    type: CONFIGS_GROUP controller sunxi-pinctrl group PG9 (96) 00010002

PWM mapping:

root@astar-ibt-8723bs:/ # cat /sys/kernel/debug/pwm
platform/sunxi_pwm, 2 PWM devices
 pwm-0   (lcd                 ): requested
 pwm-1   ((null)              ):

U-Boot log:

U-Boot 2011.09-rc1-00024-g36bb972 (Jun 26 2017 - 09:39:25) Allwinner Technology

[      0.271]version: 2.1.0
[      0.360]pmbus:   ready
[      0.362]PMU: AXP221
[      0.364]PMU: AXP22x found
[      0.368]PMU: dcdc3 1200
[      0.371]PMU: pll1 1008 Mhz,PLL6=600 Mhz
AXI=336 Mhz,AHB=200 Mhz, APB1=100 Mhz
set power on vol to default
dcdc1_vol = 3000
dcdc2_vol = 1100
dcdc3_vol = 1200
dcdc4_vol = 0
dcdc5_vol = 1500
aldo2_vol = 2500
aldo3_vol = 3000
find power_sply to end
vbus pc exist, limit to pc
fel key old mode
run key detect
no key found
no key input
dram_para_set start
dram_para_set end
[      0.496]DRAM:  512 MiB
relocation Offset is: 15aee000
smcl's set manager is NULL
OSAL_Power_Enable:<axp22, dc1sw>
workmode = 0
[      0.702]NAND: NAND_UbootInit
NAND_UbootInit start
NB1 : enter NAND_LogicInit
uboot:nand version: 2 32 20170220 1103
nand : get id_number_ctl from script, 2
uboot:nand info: ab14dead ffff4a42 318c 60704 6
nand : get sorting_flag fail, a
nand : get CapacityLevel fail, 5fb7fc70
not burn nand partition table!
NB1 : nftl num: 2
 init nftl: 0
NB1 : NAND_LogicInit ok, result = 0x0
[      1.237]sunxi flash init ok
sunxi secure storage is not supported
find key burned flag
In:    serial
Out:   serial
Err:   serial
--------fastboot partitions--------
-total partitions:12-
-name-        -start-       -size-
bootloader  : 1000000       2000000
env         : 3000000       1000000
boot        : 4000000       1000000
system      : 5000000       30000000
misc        : 35000000      1000000
recovery    : 36000000      2000000
cache       : 38000000      20000000
metadata    : 58000000      1000000
private     : 59000000      1000000
klog        : 5a000000      1000000
alog        : 5b000000      4000000
UDISK       : 5f000000      0
-----------------------------------
base bootcmd=run setargs_nand boot_normal
bootcmd set setargs_nand
key 0
recovery key high 100, low 2
cant find fstbt value
misc partition found
misc_message->command = 0
to be run cmd=run setargs_nand boot_normal
mount part name bootloader
cant open script.bin, maybe it is not exist
WORK_MODE_BOOT
board_status_probe
[      1.351]pre sys mode
sunxi_bmp_logo_display
screen_id =0, screen_width =1024, screen_height =600
[      1.474]Hit any key to stop autoboot:  0
read boot or recovery all
[      1.953]sunxi flash read :offset 4000000, 12626790 bytes OK
no signature
[      1.962]ready to boot
para err in disp_ioctl, cmd = 0xa,screen id = 1
[      1.969][mmc]: MMC Device 2 not found
[      1.973][mmc]:  mmc  not find,so not exit
NAND_UbootExit
NB1 : NAND_LogicExit
nand release dma:0
[      1.977]
Starting kernel ...

PMIC info from dmesg:

[    0.520045] axp22_board axp22_board: AXP (CHIP ID: 0x06) detected
[    0.522136] axp22_dcdc1: 1600 <--> 3400 mV at 3000 mV
[    0.522136] axp22_dcdc2: 600 <--> 1540 mV at 1100 mV
[    0.522136] axp22_dcdc3: 600 <--> 1860 mV at 1200 mV
[    0.522136] axp22_dcdc4: 600 <--> 1540 mV at 1100 mV
[    0.522136] axp22_dcdc5: 1000 <--> 2550 mV at 1500 mV
[    0.522136] axp22_rtc: 3000 mV
[    0.522136] axp22_aldo1: 700 <--> 3300 mV at 3000 mV
[    0.522136] axp22_aldo2: 700 <--> 3300 mV at 2500 mV
[    0.522136] axp22_aldo3: 700 <--> 3300 mV at 3000 mV
[    0.522136] axp22_dldo1: 700 <--> 3300 mV at 700 mV
[    0.522136] axp22_dldo2: 700 <--> 3300 mV at 700 mV
[    0.522136] axp22_dldo3: 700 <--> 3300 mV at 700 mV
[    0.522136] axp22_dldo4: 700 <--> 3300 mV at 700 mV
[    0.522136] axp22_eldo1: 700 <--> 3300 mV at 700 mV
[    0.522136] axp22_eldo1: supplied by axp22_dcdc1
[    0.522136] axp22_eldo2: 700 <--> 3300 mV at 700 mV
[    0.522136] axp22_eldo2: supplied by axp22_dcdc1
[    0.522136] axp22_eldo3: 700 <--> 3300 mV at 700 mV
[    0.522136] axp22_eldo3: supplied by axp22_dcdc1
[    0.522136] axp22_dc5ldo: 700 <--> 1400 mV at 1100 mV
[    0.522136] axp22_ldoio0: 700 <--> 3300 mV at 3800 mV
[    0.522136] axp22_ldoio1: 700 <--> 3300 mV at 3800 mV
[    0.530071] axp22_dc1sw: at 700 mV
[    0.530071] axp22_dc1sw: supplied by axp22_dcdc1
[    0.565902] no usbc(0) det_vbus gpio and try to axp det_pin
[    0.669659] [rtl8723bs]: module power name axp22_dldo1
[    0.669673] [rtl8723bs]: module power ext1 name axp22_dldo2
[    0.669849] [rtl8723bs]: rtl8723bs module power set by axp.
[   12.940521] lcd_power0:axp22_dc1sw
[   14.590835] [sw_device]:get_power_para: power_ldo = axp22_ldoio1,power_ldo_vol = 3300,power_io = 0,reset_pin = 225

More info from dmesg:

[   24.900024] ctp_wakeup gpio number is 225
[   24.904473] ctp_irq gpio number is 37

Also known as

Nimbus 17 V1

Inet U70B

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