On Fri, 21 Aug 2020 20:34:07 +1000, Michael Ellerman wrote:

It's possible to enable CONFIG_PPC_EARLY_DEBUG_BOOTX for a pseries
kernel (maybe it shouldn't be), which is then booted with qemu/slof.

But if you do that the kernel crashes in draw_byte(), with a DAR
pointing somewhere near INT_MAX.

Adding some debug to prom_init we see that we're not able to read the
"address" property from OF, so we're just using whatever junk value
was on the stack.

[...]

Applied to powerpc/next.

[1/1] powerpc/prom_init: Check display props exist before enabling btext
      https://git.kernel.org/powerpc/c/6c71cfcc01685ef495ca7886471a76e73446424e

cheers