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

Follow-up Comment #4, bug #64471 (project grub):

You are right. Not every EFI works with GRUB_EFI_MAX_USABLE_ADDRESS
0xffffffffffULL. My laptop won't boot if I change it. Grub simply unable to
open drive (ssd) and unlock the key. Not sure what is going on.

Laptop:

[    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009ffff] usable
[    0.000000] BIOS-e820: [mem 0x00000000000a0000-0x00000000000fffff]
reserved
[    0.000000] BIOS-e820: [mem 0x0000000000100000-0x0000000009cfefff] usable
[    0.000000] BIOS-e820: [mem 0x0000000009cff000-0x000000000a000fff]
reserved
[    0.000000] BIOS-e820: [mem 0x000000000a001000-0x000000000a1fffff] usable
[    0.000000] BIOS-e820: [mem 0x000000000a200000-0x000000000a20efff] ACPI
NVS
[    0.000000] BIOS-e820: [mem 0x000000000a20f000-0x00000000bb251fff] usable
[    0.000000] BIOS-e820: [mem 0x00000000bb252000-0x00000000bc755fff]
reserved
[    0.000000] BIOS-e820: [mem 0x00000000bc756000-0x00000000bc7b1fff] ACPI
data
[    0.000000] BIOS-e820: [mem 0x00000000bc7b2000-0x00000000bc964fff] ACPI
NVS
[    0.000000] BIOS-e820: [mem 0x00000000bc965000-0x00000000bd140fff]
reserved
[    0.000000] BIOS-e820: [mem 0x00000000bd141000-0x00000000bd1fefff] type 20
[    0.000000] BIOS-e820: [mem 0x00000000bd1ff000-0x00000000bdffffff] usable
[    0.000000] BIOS-e820: [mem 0x00000000be000000-0x00000000bfffffff]
reserved
[    0.000000] BIOS-e820: [mem 0x00000000f0000000-0x00000000f7ffffff]
reserved
[    0.000000] BIOS-e820: [mem 0x00000000fd000000-0x00000000fdffffff]
reserved
[    0.000000] BIOS-e820: [mem 0x00000000feb80000-0x00000000fec01fff]
reserved
[    0.000000] BIOS-e820: [mem 0x00000000fec10000-0x00000000fec10fff]
reserved
[    0.000000] BIOS-e820: [mem 0x00000000fed00000-0x00000000fed00fff]
reserved
[    0.000000] BIOS-e820: [mem 0x00000000fed40000-0x00000000fed44fff]
reserved
[    0.000000] BIOS-e820: [mem 0x00000000fed80000-0x00000000fed8ffff]
reserved
[    0.000000] BIOS-e820: [mem 0x00000000fedc4000-0x00000000fedc9fff]
reserved
[    0.000000] BIOS-e820: [mem 0x00000000fedcc000-0x00000000fedcefff]
reserved
[    0.000000] BIOS-e820: [mem 0x00000000fedd5000-0x00000000fedd5fff]
reserved
[    0.000000] BIOS-e820: [mem 0x00000000ff000000-0x00000000ffffffff]
reserved
[    0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000041e2fffff] usable
[    0.000000] BIOS-e820: [mem 0x000000041e300000-0x000000043fffffff]
reserved




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))}' 



0xa20f000-0xbb251fff 2GB
0x100000000-0x41e2fffff 12GB


Desktop memory map on the screenshots.


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