I noticed that the AHCI module has also only been added to the kernel building very recently to aarch64. Thank you very much, because I can confirm that USB works well here after my Improving aarch64-image booting (+ ESPRESSObin network setup).
@arne_f As the author of the AHCI change, may I kindly ask you, if you could also enable that CONFIG_USB_UAS line for aarch64 and armv5tel?