Comment 43 for bug 1848703

I'm now running a 2019-09-26-raspbian-buster-lite.img with 4.19.75-v7l+ kernel and /dev/mmcblk0* are correctly populated.

pi@raspberrypi:~ $ dmesg | grep firmware
[ 0.090391] raspberrypi-firmware soc:firmware: Attached to firmware from 2019-09-24 17:34, variant start
[ 0.100110] raspberrypi-firmware soc:firmware: Firmware hash is cd3add54955f8fa065b414d8fc07c525e7ddffc8
[ 4.322157] vc4-drm soc:gpu: bound fe600000.firmwarekms (ops vc4_fkms_ops [vc4])

But I've also set total_mem=1024 to be on the safe side, so it may be related. I'll try to build an initramfs with BTRFS for this kernel and switch back to Ubuntu.