On 18/12/2023 at 04:26, Andrei Borzenkov wrote:
On 17.12.2023 23:50, Pascal Hambourg wrote:
...
Note 2: there have been a few lightweight PC with 32-bit UEFI firmware
and 64-bit x86 CPU around. To boot on these you need to install an x86
32-bit EFI image as bootia32.efi. It can boot i386 and amd64 kernels.
...
if [ $grub_cpu = x86_64 ]; then
# instructions to boot with amd64 kernel
elif [ $grub_cpu = i386 ]; then
# instructions to boot with i386 kernel
This obviously will not work for such systems as you mentioned earlier.
64-bit CPUs can run 32-bit kernels, so it will work but be sub-optimal.
Or you can drop support for 32-bit CPUs and load a 64-bit kernel even
with 32-bit UEFI. It seems that only early Intel Mac had 32-bit CPU and
UEFI.
Besides, distributions may require additional CPU features beyond mere
"supports 64 bit".
Do you mean 32-bit CPU features such as PAE ?
