The first device with the Allwinner A733 (Cortex-A76 Dual-Core, Cortex-A55 Hexa-Core, RISC-V E902 Single-Core CPU). Sells for around 80 USD. Surprisingly good look and feel (metal back) for that price class.

Pictures

Teclast P50Ai
Manufacturer	Teclast
Dimensions	258mm x 170mm x 8.3mm, 540g
Release Date	2024
Website	P50Ai Product Page
Specifications
SoC	A733 @ 2.0Ghz
DRAM	6 GiB LPDDR5 @ Unknown MHz
NAND	128 GiB UFS
Power	DC 5V, 7000mAh 3.7V Li-Ion battery
Features
LCD	1280x800@90Hz (10.92" 16:10)
Touchscreen	yes
Video	USB-C DisplayPort video out
Audio	3.5mm headphone plug, internal stereo speakers, internal microphone
Network	WiFi 6 (AICSemi AIC8800), BT 5.4
Storage	µSD, eMMC
USB	1 x USB3.0 OTG via USB-C, 1 x USB host-only
Camera	5MP front, 13MP + 0.08MP rear

Locating the UART

UART is exposed via the Micro SD card slot. A Micro SD breakout is required (or opening the tablet and soldering cables directly).

More information can be found here: https://linux-sunxi.org/MicroSD_Breakout

Boot log (stock firmware)

The BSP outputs some boot information via UART0 pinmuxed on the PortF pins 2 & 4, which can be accessed via a microSD breakout board without opening the device.

boot log from factory firmware

[641]HELLO! SBOOT is starting!
[644]sboot commit : {12e38aac}
[650]PMU: AXP8191
[652]pmu_chip_id = 14
[654]set pll start
[656]cpul clk 0xf8802700!
[659]cpub clk 0xf8802700!
[662]dsu clk 0xf8801e00!
[665]set pll end
[671]dram_para_total:0xf
[674]vaild para:16  select dram para1
[677]board init ok
[679]rtc[3] value = 0xa301
[682]rtc[7] value = 0x2
[684]enable_jtag
[686]Driver version 0.0.9 2024.11.20 10:19
[705]Cal words efuse addr 0x60 value 0x966e0000, addr 0x64 value 0x4f23976e
[754]Device  up at:[755][RX, TX]: gear=[4, 4], lane[2, 2], pwr[FAST MODE, FAST MODE], rate = 2
[763]sc st 2
[764]Read blk size 4096,capacity 31246335
[768]DRAM BOOT DRIVE INFO: V0.596
[773]DRAM_VCC set to 560 mv
[775]DRAM CLK =1800 MHZ
[777]DRAM Type =9 (8:LPDDR4,9:LPDDR5)
[915]Training result is = 7
[917]DRAM Pstate 1 training, frequency is 1200 Mhz
[1091]Training result is = 7
[1094]DRAM Pstate 2 training, frequency is 800 Mhz
[1433]Training result is = 7
[1436]DRAM Pstate 3 training, frequency is 400 Mhz
[1534]Training result is = 7
[1537]DRAM Pstate 0 training, frequency is 1800 Mhz
[1545]Actual DRAM SIZE =6144 M
[1548]DRAM SIZE =6144 MBytes, para1 = a10a, para2 = 18001001, dram_tpr13 = 10065
[1558]DRAM simple test OK.
[1560]dram size = 6144
[1568]aw root ceritf rsa 2048
[1571]OLD version: 0.0
[1573]NEW version: 0.0
[1576]don't have rotpk, skip check
[1801]monitor entry=0x48000000
[1804]uboot entry=0x4a000000
[1806]optee entry=0x48600000
[1809]opensbi entry=0x0
[1812]no need rotpk flag
[1814]sec_mem_map[0]: addr = 0x48000000, size = 0x100000
[1819]sec_mem_map[1]: addr = 0x48600000, size = 0x100000
[1825]run out of boot0
NOTICE:  BL31: OP-TEE 64bit detected
NOTICE:  BL31: U-BOOT 32bit detected
NOTICE:  BL31: v2.5(debug):5fc237a6a
NOTICE:  BL31: Built : 18:21:25, Feb 21 2025
NOTICE:  BL31: No DTB found.
NOTICE:  SEC mem [0]: addr = 0x48000000, size = 0x100000
NOTICE:  SEC mem [1]: addr = 0x48600000, size = 0x100000
NOTICE:  DRM mem [2]: addr = 0xb6a00000, size = 0x9600000
M/TC: OP-TEE version: 18450130 (gcc version 9.2.1 20191025 (GNU Toolchain for the A-profile Architecture 9.2-2019.12 (arm-9.10))) #1 Sat Feb 22 07:09:25 UTC 2025 aarch64
M/TC: OP-TEE 64bit
ETC:0 0 plat_rng_init:460 prng seed by trng


U-Boot 2018.07 (Mar 21 2025 - 19:34:32 +0800) Allwinner Technology

[01.935]CPU:   Allwinner Family
[01.938]Model: sun60iw2
I2C:   ready
[02.052]DRAM:  6 GiB
[02.056]Relocation Offset is: 6c79c000, reloc addr is: b679c000
[02.116]secure enable bit: 1
[02.120]PMU: AXP8191
[02.122]PMU: AXP8191 VER_A
[02.127]BMU: AXP515
[02.130][AXP8191] charge/reboot status:0x1
[02.133][AXP515] charge/reboot status:0x62
[02.148][AXP515] battery exist:1
[02.163][AXP8191] onoff status: 0x50 = 0x0, 0x51 = 0x0
[02.168][AXP8191] charge status: 0x4 = 0x0
[02.171][AXP515] poweron irq: 0x4a:0x0, 0x4b:0x0
[02.176][AXP515] on/off status 0x6:0x0
[02.181]CPU=1014 MHz,PLL6=1200 Mhz,AHB=200 Mhz, APB1=24Mhz  MBus=600Mhz
[02.187]gic: sec monitor mode
[02.198]flash init start
[02.200]workmode = 0,storage type = 8
[ufs]:Driver version 0.0.23 2024.11.20 14:12
[ufs]:Cal words 0x60:val 0x966e0000, 0x64:val 0x4f23976e
[ufs]:[RX, TX]: gear=[4, 4], lane[2, 2], pwr[FAST MODE, FAST MODE], rate = 2
[ufs]:qTotalRawDeviceCapacity 0x000000000EE64000, max_num_alloc_units 0x00007732
[ufs]:qTotalRawDeviceCapacity 0x000000000EE64000, CapacityAdjFactor 0x00000001, bAllocationUnitSize 0x01, dSegmentSize 0x00002000, max_num_alloc_units 0x00007732, res_num_alloc_units 0
x00000004
[ufs]:dNumAllocUnits:0x000c0000
 [ufs]:bLogicalBlockSize:0
 [ufs]:bProvisioningType:3
 [ufs]:bdatareliability:1
 [ufs]:ufshcd_write_desc_param: param size is over buff len,only write buff_len
[ufs]:__ufshcd_query_descriptor: opcode 0x02 for idn 1 failed, index 0, err = 250
[ufs]:__ufshcd_query_descriptor: opcode 0x02 for idn 1 failed, index 0, err = 250
[ufs]:__ufshcd_query_descriptor: opcode 0x02 for idn 1 failed, index 0, err = 250
[ufs]:ufshcd_write_desc_param: Failed writing descriptor. desc_id 1, desc_index 0, param_offset 0, ret 250[ufs]:write config des:config logical unit
[ufs]:sc st 2
[ufs]:scsi status:Check conditon
[ufs]:blk size 4096,capacity 31246336 block
[02.361]sunxi flash init ok
[02.388]Loading Environment from SUNXI_FLASH... erase secure storage failed
OK
[02.398][AXP8191] charge/reboot status:0x0
[02.416]Warn: can't find connect driver
success get enable-num=0x2
success get lcd_id=0x1b38
success get bias-slave-addr=0x3e
i2c_get_bus_num is busnum = 1
i2c_get_bus_num is not SUNXI_VIR_I2C1!
num=[0] reg=0xda val=0x99
num=[1] reg=0xdb val=0x51
[fixup_lcdid_cmdline]:lcd_id_val=1b38
dsi0@5506000:  detailed mode clock 119166 kHz, flags[0]
    H: 0800 0840 0844 0884
    V: 1280 2203 2207 2247
bus_format: 0
secure storage read hdcpkey fail
[03.289]usb burn from boot
delay time 0
[03.295]usb prepare ok
[03.534]usb sof ok
[03.536]usb probe ok
[03.538]usb setup ok
set address 0x9
set address 0x9 ok
[03.944]do_burn_from_boot usb : have no handshake
skip update boot_param
List file under ULI/factory
Error: FAT sector size mismatch (fs=4096, dev=512)
[03.960]update part info
[03.965]battery temp is 264
[03.968]update bootcmd
[04.004]change working_fdt 0xb274be30 to 0xb271be30
ret 0
[04.038]update dts
Hit any key to stop autoboot:  0
val is 379
Android's image name: arm64
ERROR: reserving fdt memory region failed (addr=b6a00000 size=9600000)
ERROR: reserving fdt memory region failed (addr=b27e1000 size=3e8000)
[04.378]Starting kernel ...

[04.380]total: 4380 ms

[ufs]:sync cache
NOTICE:  [SCP] :wait arisc ready....
NOTICE:  [SCP] :arisc version: [-00661-gb9f31a5b5a8-dirty]
NOTICE:  [SCP] :arisc startup ready
NOTICE:  [SCP] :arisc startup notify message feedback
NOTICE:  [SCP] :sunxi-arisc driver is starting
NOTICE:  BL3-1: Next image address = 0x40080000
NOTICE:  BL3-1: Next image spsr = 0x3c9
[    0.000000][    T0] Booting Linux on physical CPU 0x0000000000 [0x412fd050]
[    0.000000][    T0] Linux version 6.6.30-android15-8-gcdcd52e8915f-ab12246136-4k (kleaf@build-host) (Android (11368308, +pgo, +bolt, +lto, +mlgo, based on r510928) clang version 18.
0.0 (https://android.googlesource.com/toolchain/llvm-project 477610d4d0d988e69dbc3fae4fe86bff3f07f2b5), LLD 18.0.0) #1 SMP PREEMPT Mon Aug 19 16:01:06 UTC 2024
[    0.000000][    T0] KASLR disabled due to lack of seed
[    0.000000][    T0] random: crng init done
[    0.000000][    T0] Machine model: sun60iw2
[    0.000000][    T0] stackdepot: disabled
[    0.000000][    T0] earlycon: uart8250 at MMIO32 0x0000000002500000 (options '')
[    0.000000][    T0] printk: bootconsole [uart8250] enabled
[    0.279185][  T124] AW BSP version: UNKNOWN, 2025-03-21 19:34:38
AW_Keymint_v3_CreateEntryPoint
Gatekeeper_TA_CreateEntryPoint

Manufacturer images

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Teclast P50Ai

Contents

Pictures

Locating the UART

Boot log (stock firmware)

See also

Manufacturer images

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