From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from list by lists.gnu.org with archive (Exim 4.71) id 1hPVtn-00065I-VA for mharc-grub-devel@gnu.org; Sat, 11 May 2019 13:35:03 -0400 Received: from eggs.gnu.org ([209.51.188.92]:35030) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hPVtm-00064F-II for grub-devel@gnu.org; Sat, 11 May 2019 13:35:03 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hPVrr-0000ag-4m for grub-devel@gnu.org; Sat, 11 May 2019 13:33:03 -0400 Received: from mout.gmx.net ([212.227.15.19]:41255) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1hPVrq-0000aG-SY for grub-devel@gnu.org; Sat, 11 May 2019 13:33:03 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1557595980; bh=DDbqG0qMiar8QoWgZ6vKf/UqapWHkYtZsbfkwPXlvUs=; h=X-UI-Sender-Class:Date:From:To:Subject:References:In-Reply-To; b=GjVLF1pl40DAl7c2iJBW7ATRewdLNCWvh8uqvoOgWK+4PxAXJsWNzMaNGmf3a4SWy UfVJNRySrpax6u2r37hidenwg4Ig1ctGiVU1CMcawhGGEFYbms7dKNMZVkslksuJb3 RvBc7vRd7ZDJ4pB6tP4AM9Y+Kblnq75f3LNm5A+g= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from scdbackup.webframe.org ([79.222.46.132]) by mail.gmx.com (mrgmx001 [212.227.17.190]) with ESMTPSA (Nemesis) id 0LzKmP-1gd69l2nc9-014Wls for ; Sat, 11 May 2019 19:33:00 +0200 Date: Sat, 11 May 2019 19:31:23 +0200 From: "Thomas Schmitt" To: grub-devel@gnu.org Subject: Re: grub-mkrescue: Problem with MBR partition table at start of EFI partition Content-Type: text/plain; charset="utf-8" References: <20190511142010.wwddbacurjzi542i@pelzflorian.localdomain> In-Reply-To: <20190511142010.wwddbacurjzi542i@pelzflorian.localdomain> Message-Id: <205716785714791002879@scdbackup.webframe.org> X-Provags-ID: V03:K1:WBu3no431k2c8KzDc2GCsGqijAT82e9hWNpeGV2WWKj0DcEvhwL RmpqSU8VxOwTxxev0Ee6IUp+Fv4v9Aj4oZ5ibTcNxy0t5cb265zVGI4XDpEIMda7EK6LqSg 8ZhM83QxpJYKhSvKBEILCdbLK8nEvaAqJUKlgrvHM4agIcY45i55wlIzvEuEZ1iAUjF1rTe F+Y33itHEMZXjGrUX8MNA== X-UI-Out-Filterresults: notjunk:1;V03:K0:x8ts/U6dkFA=:GRXYT35tiuZEZJ2QYtzX0n /8B4d97qpreGK31sCaW2YMlN+IWbO4yx9AcxReLrpsaHx4TqZzjKMR3ubp9Nwfax+ggLitYKl MsKu+Dv8jgeGFo5AjawYJNsg4r6o5GRjj4SUmXKJMRYvdHWK7dG180+lZgxX8K9SP0lNESHGH KbOUCglsttD6/8uRFiGgHDz9c8s+2DmTkyxhG/XBAZEDsczh/R1xL8NH1DaDTS2mGI14wGkpc zub9QrL6PE6XbI1XO5FC3PGGsS17WRWNlT6tJ8Usvvd+DnivJ+/fOULnekqaThLUFiwwzkNtz 60LmPKfWWgtqzKAeZaJjbTDDFnfUDxzJP+D+UrejvUi/Jcamqsri7ldYyPrn0uDEU2qx+mcyS SuHBON+04lL8bL4wpwEz0rYs3TlNY0vK//JrZXJw0zEVmaQ97HLhOEl25zdEF9/jXBD42ASA+ M7pGxCQ9NrmUG9yfOsS/+KsZtg15y9C3O520FEJpYOZBQDJqkH4xXZUEcvVOAtM1Br6LBk39Y QpMrLkNZMeOhSgaiQ/uemG+wbXHQX2ckG2siYVP99tTFZEqMvS1nF/oUQLccrrYmFoLN8U5nP nPSXXMHu4fWDdydpUJrlstgifbPkB70Xk43WBw0PpW6ISc4jf82B4YdKQCKdHI30zj/KCIy6I DrnBI8eJ7l2ZeiGTsCkC5X1L7uDF3RpQ6wgcJsq/NBslr/JJCkshu+vWYcZfjf8iS6vwc+W2u FKHpfoCQRJUOXe9I6hFeOASU55/tZGBC/JtZN0gEqQgR3RDvulf6lPM+W1FdXt8lv8L3xDHbL 8OND9BLKmJv39V7WLLDgbbn5hNkGxq2qGr6xeUr0OPta795V72d4VH7RRBGaVAfu3d3zqRlCo lLGnzkJDl3DJDLqJXBVVmsxyEN2rYYSsSU3wYdEDexUTVEvBPeowC6xIyxrl7RA8pVwGVssAi ttp/pEtZx2Q== X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 212.227.15.19 X-BeenThere: grub-devel@gnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: The development of GNU GRUB List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 11 May 2019 17:35:03 -0000 Hi, Florian Pelz wrote: > Shall I continue testing? I'm into ISO images. But it might be interesting to see what Microsoft deems to be bootable and is willing to promote by its weight. > I do not know how to verify on Windows if the boot used UEFI. You could zeroize the x86 machine code in the MBR: dd if=/dev/zero bs=1 count=446 of=/dev/sdb Then BIOS/CSM legacy mode should not have anything to start with. (It would be interesting to know whether there is useful machine code in the MBR at all.) Similarly you could rename the efi/boot directory in order to hide the EFI start-up programs and thus to prevent EFI booting. Have a nice day :) Thomas