Can't bootNetBSD 11 on RaspberryPi 4 from SDCARD - black screen (HDMI)

[Piotr Kolasiński <nome%nutilius.eu@localhost>]

 Hi!

 I try to boot NetBSD 11 on RasPi 4 from sdcard and see (initalized, because monitor detected signal) 
 black screen. I've downloaded sdcard image from:
 https://nycdn.netbsd.org/pub/arm/NetBSD-10.2-release/NetBSD-10-aarch64--generic.img.gz
 and succesfully mounted the card on FreeBSD instance - seems to be good.
 
 When I boot writhout the card - I see RasPi bootloader screen with
 messages about boot mode, nd lacking of sdcard, but after inserting 
 the card - boot process is going to the black screen again. 
 Do I nedd special version of image, some diffrent settings in the boot
 screen or maybe soemthing else?

 Piotr