[bug #29873] GRUB2 - can't read the 'grub' dir from /boot-partition at a "cold" start

[Eugene]

Follow-up Comment #7, bug #29873 (project grub):

Reply to https://savannah.gnu.org/bugs/index.php?29873#comment3

The method of proof by contradiction.

Assume that the FS (in the first partition of sda, sizeof(sda1) = 64 Mb)
places directory /grub after the Limit, and BIOS can't read after this Limit.

With this assumption, the following statements are true:
- Limit is less than 64 Mb
- At the beginning of boot of linux from /dev/sdb directory /grub on
/dev/sda1 moves below the Limit and becomes readable
- At the powering off directory /grub on /dev/sda1 is moved above the Limit
and becomes unreadable

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