[bug #64471] grub efi memory allocation (efi/mm) does not work on every machine

[Alexey Kuznetsov]

Follow-up Comment #2, bug #64471 (project grub):

My laptop wont boot with GRUB_EFI_MAX_USABLE_ADDRESS 0xffffffffffULL (asus),
but desktop works fine (gigabyte).

Looks like we can detect how much memory we have.

Running simple script can show how much memory we have below 4GB mark and
above:

dmesg | awk '/usable/ && /BIOS-e820/ && match($0, /mem
([0-9a-z]+)-([0-9a-z]+)/,aa){s=strtonum(aa[1]);e=strtonum(aa[2]);if(s<0x100000000
&& e-s>1*1024*1024*1024)printf("0x%x-0x%x
%dGB\n",s,e,((e-s)/1024/1024/1024))}'

following script print all memory blocks more then 1GB size:

dmesg | awk '/usable/ && /BIOS-e820/ && match($0, /mem
([0-9a-z]+)-([0-9a-z]+)/,aa){s=strtonum(aa[1]);e=strtonum(aa[2]);if(e-s>1*1024*1024*1024)printf("0x%x-0x%x
%dGB\n",s,e,((e-s)/1024/1024/1024))}'

And if we do not have 1-2GB blocs below 4GB we need to increase
GRUB_EFI_MAX_USABLE_ADDRESS 


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