Bug#977645: 5.10.1 Debian kernel does not boot on raspi 4 with ext4 rootfs and sdcard

[Ryutaroh Matsumoto <ryutaroh@ict.e.titech.ac.jp>]

Control: reassign -1 linux-image-5.10.0-1-arm64 5.10.4-1
Control: severity -1 important

I checked the reported symptom with
linux-image-5.10.0-1-arm64 5.10.4-1

It booted with completely garbled screen output.
disable_fw_kms_setup=1 in config.txt did not help.
Removing vc4.ko let the screen output normal.
/proc/cmdline looked like
dma.dmachans=0x71f5 bcm2709.boardrev=0xd03114 bcm2709.serial=0x488d2af3 bcm2709.uart_clock=48000000 bcm2709.disk_led_gpio=42 bcm2709.disk_led_active_low=0 smsc95xx.macaddr=DC:A6:32:BB:99:D9 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000  console=tty0 console=ttyS1,115200 root=LABEL=RASPIROOT rw fsck.repair=yes net.ifnames=0 cma=64M rootwait

Ryutaroh