There are solderpoints next to the power connector, it seems to be a usb-a port ?
Im loving to use openwrt, I have very fantastic Wifi6 hardware but the firmware is limiting everything and makes it useless, I can't even upload a firmware-image file, just pull OTA-Updates if available by vodafone.
The webinterface is built with vue, there are no ports open except 53 (DNS) and 80/443 for webinterface.
I'd think any soldering pads for serial would rather be on the other side of your PCB, going by the FCC pictures. I couldn't tell you which ones though.
This board has many, sadly unmarked, test points, hot candidates might be the three horizontal ones left to QJ2012A and the 6 vertical ones above that chip, but many of the other could also be the one (e.g. the trapezoid made out of 6 test points below the three mentioned above). You will have to measure, ideally with a scope and/ or logic analyzer.
The pins/ test points for the serial console are typically not too far away from the SOC, often quite close to the flash chip - and their 4 pins (Vcc, GND, RX, TX in random order) are often easy to spot, but not always (and Vcc might be omitted, so 3 pins can be enough - or even 2, if you borrow GND from somewhere else on the board).
Looks like the three horizontal test points left of QJ2012A, as marked on the image, are the serial port for the modem (not the main CPU). Careful as it's 1.8 V. My (homebrew) serial converter works fine with those signal levels but I'd need to build a divider for TX.
UEFI Start [ 833]
- 0x08F701000 [ 847] Sec.efi
PROD Mode : On
ASLR : On
Timer Delta : +13 mS
RAM Entry 0 : Base 0x0000000080000000 Size 0x0000000010000000
RAM Entry 1 : Base 0x0000000090000000 Size 0x0000000010000000
Could not find the DBI Dump region .
UEFI Ver : 5.0.210901.BOOT.UEFI.4.0-00195-SDX55LEZB-2
Build Info : 32b Sep 1 2021 08:34:05
Boot Device : NAND
DEP Enabled
PM3: 33, PM4: 42,
-----------------------------
Platform Init [ 1273] BDS
UEFI Ver : 5.0.210901.BOOT.UEFI.4.0-00195-SDX55LEZB-2
Platform : MTP
Subtype : 11
Chip Name : SDX55
Chip Ver : 2.0
Core 0 Freq: 1497 MHz
-----------------------------
UEFI Total : 441 ms
POST Time [ 1274] OS Loader
Loader Build Info: Sep 1 2021 12:14:54
VB: RWDeviceState: Succeed using devinfo!
Total DDR Size: 0x0000000020000000
KeyPress:0, BootReason:0
Fastboot=0, Recovery:0
GetVmData: No Vm data present! Status = (0x80000003)
VM Hyp calls not present
Booting Into Mission Mode
Loading Image Start : 1378 ms
Loading Image Done : 1384 ms
Total Image Read size : 4096 Bytes
Loading Image Start : 1384 ms
Loading Image Done : 2068 ms
Total Image Read size : 7536640 Bytes
Loading Image Start : 2068 ms
Loading Image Done : 2122 ms
Total Image Read size : 524288 Bytes
VB: LoadImageAndAuthForLE complete!
GetVmData: No Vm data present! Status = (0x80000003)
Memory Base Address: 0x80000000
Dtbo hdr magic mismatch FFFFFFFF, with D7B7AB1E
Best match DTB tags 357/0B010008/0x0000000B/20000/0/0/0/20021/(offset)0x84B657B8/(size)0x00000000
Using pmic info 0x0/0x0/0x0/0x20021 for device 0x0/0x0/0x0/0x20021
Memory Base Address: 0x80000000
Failed to get Boot Device Base address, Buffer Too Small
Failed to get Boot Device: Buffer Too Small
Unable to get Panel Config, Not Found
USB Composition Magic Verification Failed
USB Composition Magic Verification Failed
USB Composition Magic Verification Failed
Cmdline: noinitrd ro rootwait androidboot.hardware=qcom msm_rtb.filter=0x237 lpm_levels.sleep_disabled=1 firmware_class.path=/lib/firmware/updates service_locator.enable=1 net.ifnames=0 atlantic_fwd.rx_ring_size=1024 rootfstype=ubifs rootflags=bulk_read
RAM Partitions
Add Base: 0x0000000080000000 Available Length: 0x0000000010000000
Add Base: 0x0000000090000000 Available Length: 0x0000000010000000
Failed to get MinPasrSize, Status = Unsupported
Unable to get splash buffer info, Not Found
Update Device Tree total time: 24 ms
No valid dtbo image found
Shutting Down UEFI Boot Services: 2214 ms
BDS: LogFs sync skipped, No Media
App Log Flush : 72 ms
Exit BS [2289] UEFI End
mdm 0742 sdxprairie ttyMSM0
sdxprairie login:
Checking out the 6 vertical ones will require disassembly of the heatsink. Also, the 6 test points in the trapezoid don't appear to be a serial port.
