Allwinner A10 tablet - Not able to go past "Starting kernel..."

I had an old tablet lying around so I created the page according to linux-sunxi (https://linux-sunxi.org/Softwinners_crane ). I was trying to get Linux running on it. A different tablet was similar (as also pointed out in another mailing list) to mine - Topwise A721, so I used it's .dts file for this. After following the extensive documentation on the website, collecting all details and so on, I built u-boot and kernel and flashed them on an SD card. When trying to boot I get stuck at this screen, and then the display goes off:

U-Boot 2025.07-rc2-00018-g126a88d49bca (May 18 2023 - 10:35:18 +0530) Allwinner Technology

CPU:   Allwinner A10 (SUN4I)
Model: Topwise A721
DRAM:  1 GiB
Core: 70 devices, 21 uclasses, devicetree: separate
WDT:   Not starting watchdog@01c20c90
MMC:   mmc@1c0f000: 0
Loading Environment from FAT... Unable to read "uboot.env" from mmc0:1...
HDMI connected: Setting up a 1920x1080 hdmi console (overscan 0x0)
In:    serial,usbkbd
Out:   serial,vidconsole
Err:   serial,vidconsole
Net:   No ethernet found.

starting USB...
No host cable detected. Bus usb@01c13000: Port not available.
No USB controllers found
   scanning USB for storage devices... 0 Storage Device(s) found
Hit any key to stop autoboot: 0
switch to partitions #0, OK
mmc0 is current device
Scanning mmc0:1...
Found U-Boot script /boot.scr
301 bytes read in 1 ms (293.9 KiB/s)
## Executing script at 43100000
24070 bytes read in 3 ms (7.7 MiB/s)
6105264 bytes read in 335 ms (21.6 MiB/s)
Kernel image @ 0x42000000 [ 0x000000 - 0x5d28b0 ]
## Flattened Device Tree blob at 43000000 
   Booting using the fdt blob at 0x43000000 
Working FDT set to 43000000
   Loading Device Tree to [49ff7000, end 49fffe05] ... OK
Working FDT set to 49ff7000 

Starting kernel ...

How do I fix this?