On Wed, Aug 31, 2022 at 04:42:05PM +0200, Maxime Ripard wrote: > Sorry for the fairly broad list of recipients, I'm not entirely sure > where the issue lies exactly, and it seems like multiple areas are > involved. > > Martin reported me an issue discovered with the VC4 DRM driver that > would prevent the RaspberryPi4 from booting entirely. At boot, and > apparently before the console initialization, the board would just die. > > It first appeared when both DYNAMIC_DEBUG and DRM_VC4 were built-in. We > started to look into what configuration would trigger it. > > It looks like a good reproducer is: > > ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make -j18 defconfig mod2yesconfig > ./scripts/config -e CONFIG_DYNAMIC_DEBUG > ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make -j18 olddefconfig Interestingly, this was making the kernel Image cross the 64MB boundary. I've compiled the same configuration but with -Os, and then tried to boot the failing configuration with U-Boot instead of the RaspberryPi firmware, and both of them worked. I guess that leaves us with a bootloader bug, and nothing related to Linux after all. Sorry for the noise, Maxime
