On Mon, Apr 7, 2025 at 9:13 PM Vladimir 'phcoder' Serbinenko <phco...@gmail.com> wrote: > > Why does it crash? Is it because of MMU or is it because of relocations?
The first, it crashes super early on before anything is even visible on screen. I think it is essentially a firmware error where it they advertise memory that isn't actually usable. > Arm is trickier than x64 add we can't be sure that there is any memory under > 4GiB mark. Entire memory may be married above 4GiB urgh indeed. Just learnt that it won't work on Apple hardware for example. I suppose another way to deal with this could be a machine specific quirk. We can identify the affected machines via smbios but it would have to happen pretty early on to work. > > Le lun. 7 avr. 2025, 21:31, Tobias Heider <tobias.hei...@canonical.com> a > écrit : >> >> Some Qualcomm Snapdragon X Elite based machines like the Lenovo Thinkpad T14s >> crash when trying to use memory above 0xffffffff. >> Enforcing the same 4GB limit as we do on x86_64 fixes the issue. >> >> Signed-off-by: Tobias Heider <tobias.hei...@canonical.com> >> --- >> include/grub/arm64/efi/memory.h | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/include/grub/arm64/efi/memory.h >> b/include/grub/arm64/efi/memory.h >> index c6cb32417..2c64918e3 100644 >> --- a/include/grub/arm64/efi/memory.h >> +++ b/include/grub/arm64/efi/memory.h >> @@ -1,6 +1,6 @@ >> #ifndef GRUB_MEMORY_CPU_HEADER >> #include <grub/efi/memory.h> >> >> -#define GRUB_EFI_MAX_USABLE_ADDRESS 0xffffffffffffULL >> +#define GRUB_EFI_MAX_USABLE_ADDRESS 0xffffffff >> >> #endif /* ! GRUB_MEMORY_CPU_HEADER */ >> -- >> 2.48.1 >> >> >> _______________________________________________ >> Grub-devel mailing list >> Grub-devel@gnu.org >> https://lists.gnu.org/mailman/listinfo/grub-devel > > _______________________________________________ > Grub-devel mailing list > Grub-devel@gnu.org > https://lists.gnu.org/mailman/listinfo/grub-devel _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org https://lists.gnu.org/mailman/listinfo/grub-devel
