From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from lists.gentoo.org (pigeon.gentoo.org [208.92.234.80]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by finch.gentoo.org (Postfix) with ESMTPS id 3BD0A1581E7 for ; Sun, 28 Apr 2024 17:41:00 +0000 (UTC) Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id DAB47E29F3; Sun, 28 Apr 2024 17:40:54 +0000 (UTC) Received: from ciao.gmane.io (ciao.gmane.io [116.202.254.214]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (prime256v1) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by pigeon.gentoo.org (Postfix) with ESMTPS id 68587E29AA for ; Sun, 28 Apr 2024 17:40:54 +0000 (UTC) Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1s18WC-0009eJ-3m for gentoo-user@lists.gentoo.org; Sun, 28 Apr 2024 19:40:52 +0200 X-Injected-Via-Gmane: http://gmane.org/ To: gentoo-user@lists.gentoo.org From: Grant Edwards Subject: [gentoo-user] Re: Grub, gpt partitions and BIOS, not uefi thing. Date: Sun, 28 Apr 2024 17:40:48 -0000 (UTC) Message-ID: References: <3298963.44csPzL39Z@rogueboard> User-Agent: slrn/1.0.3 (Linux) Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org X-Auto-Response-Suppress: DR, RN, NRN, OOF, AutoReply X-Archives-Salt: d82be662-8e85-4469-ae0d-5869a80a36d4 X-Archives-Hash: b572ca734d6421cc0e4ea04ee7e3fde8 On 2024-04-28, Grant Edwards wrote: > With DOS disk lables, Grub uses empty space between the boot sector > and the first partition as a location to store it's core image file. > That empty space does not exist when using GPT disk label. When using > a GPT disk label, Grub requires that you need to create a "BIOS Boot" > or "Grub Boot" partition so that Grub has somwhere to store it's core > image[1]. And it bears repeating that the bios/grub boot partition only needs to be 1 or 2MB in size, is _not_ formatted with a filesystem, and is _not_ the same as either 1) The "boot" directory where the kernel images and grubs other files are installed within a Linux filesystem. [Which you still need when booting in Legacy/BIOS mode.] or 2) The UEFI partition that's formated with a FAT filesystem and used in UEFI boot mode [which you don't need when booting in Legacy/BIOS mode.]