Sony QDA-EX1 not useable

[Durmeldier]

Hi,

unfortunately my Sony QDA-EX1 XQD card adapter is not functional with this driver.
Succesfully compiled and installed the sxs module.
The kernel loads the module, but in the log it complains that 'loading out-of-tree module taints kernel'.
lspci -v finds the card:
05:00.0 Mass storage controller: Sony Corporation SxS Pro+ memory card
Subsystem: Sony Corporation SxS Pro+ memory card
Physical Slot: 1
Flags: bus master, fast devsel, latency 0, IRQ 11
Memory at f5f00000 (64-bit, non-prefetchable) [size=4K]
Capabilities: [40] Power Management version 3
Capabilities: [48] Vital Product Data
Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+
Capabilities: [70] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [200] L1 PM Substates

No new device is listed in /dev

gentoo linux with kernel 5.4.38 on Lenovo ThinkPad W701.

Any idea what went wrong?

Thank you for your support.
Best regards
Wolfram