I'm booting my Pis without u-boot with this in my config.txt:
[pi4]
enable_gic=1
armstub=armstub8-gic.bin
total_mem=1024
[all]
kernel=vmlinuz
initramfs initrd.img followkernel
arm_64bit=1
gpu_mem=32
dtparam=eee=off
This exact setup works fine on my Pi 3B+ (and also my Pi 2B has this
non-u-boot-setup - they both boot fine this way.) The Pi 4 only even
tries to boot with that total_mem=1024 line in the config.txt. Without
that line (i.e. with the full 4GB RAM) it stays at the rainbow screen.
But this isn't the big issue.
When booting, it's failing to detect the SD card and thus the root
filesystem. This is with today's updates and your PPA included.
cmdline.txt is:
root=/dev/mmcblk0p2 rootfstype=ext4 rootflags=noload rootwait
verbose nosplash net.ifnames=0 dwc_otg.lpm_enable=0
dwc_otg.fiq_fix_enable=1 fsck.repair=yes modprobe.blacklist=sdhci_iproc
So what does u-boot do differently than the internal bootloader? Or what
could be the issue in my setup? I'd like to keep going without u-boot if
possible.
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https://bugs.launchpad.net/bugs/1847163
Title:
[FFe] Firmware bump for Pi 4 boot support
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https://bugs.launchpad.net/ubuntu/+source/linux-firmware-raspi2/+bug/1847163/+subscriptions
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