search for: altmbr

Hi, I'm trying to use the altmbr.bin that came with 3.80 on an ATA IDE drive. When I boot I get this error msg: > Missing operating system. > > No bootable devices--strike F1 to retry boot, F2 for setup utility. The first line is coming from syslinux, the final line is my BIOS offering for me to retry. =-=-=-=-=-=-=-=-...

Hi, i am trying to document the MBR selection by isohybrid option --partok. I assume it is related to "altmbr.bin" as described in http://www.syslinux.org/wiki/index.php/Mbr But there i read "altmbr.bin [...] boots from a partition with fixed number, see below." The "see below" probably refers to "The altmbr.bin (all 3 variants) is only 439 bytes long, -- one extra byte shou...

Just achieved success using syslinux to multi-OS boot, including a WinXP System (boot) partition that's been encrypted with TrueCrypt (TC). You'll need syslinux version 3.81-pre13 or newer to get a working altmbr.bin file. I used: http://www.kernel.org/pub/linux/utils/boot/syslinux/Testing/syslinux-3.81-pre13.zip Background: I started with a 'normal' multi-OS boot setup as follows: MBR - syslinux hda1 - 24G - [0c] - FAT32 - WinXP (Encrypted via TrueCrypt) hda2 - 53G - [0f] - E...

Hi, altmbr.bin and its variants apparently always boot the first partition (in Syslinux 4.05, but this issue seems older than that). The following example uses parted 3.0: ---------- rm -f flat mkdir mnt truncate -s 20M flat parted -s flat mklabel msdos mkpart primary fat32 1MiB 10485759B mkpart primary ext2...

...le == "--help" or $file == "-h") { > + $usage = <<"END_USAGE"; > +Usage: $0 file [maxsize] > +If maxsize is not given it will be guessed based on filename: > + - 440 bytes for mbr and gptmbr; > + - 432 bytes for isohdp; > + - 439 bytes for altmbr. > +END_USAGE > + die $usage; > +} > > if (!defined($maxsize)) { > # Defaults based on the filename > if ($file =~ /^mbr[^0-9a-z]/) { > - $maxsize = $padsize = 440; > + $maxsize = 440; > } elsif ($file =~ /^gptmbr[^0-9a-z]/) { > - $maxsiz...

On 06/25/2014 01:16 AM, Thomas Schmitt wrote: > Hi, > > i am trying to document the MBR selection by isohybrid option --partok. > > I assume it is related to "altmbr.bin" as described in > http://www.syslinux.org/wiki/index.php/Mbr > But there i read > "altmbr.bin [...] boots from a partition with fixed number, see below." > > The "see below" probably refers to > "The altmbr.bin (all 3 variants) is only 439 bytes...

...+ +if (!defined($file) or $file == "--help" or $file == "-h") { + $usage = <<"END_USAGE"; +Usage: $0 file [maxsize] +If maxsize is not given it will be guessed based on filename: + - 440 bytes for mbr and gptmbr; + - 432 bytes for isohdp; + - 439 bytes for altmbr. +END_USAGE + die $usage; +} if (!defined($maxsize)) { # Defaults based on the filename if ($file =~ /^mbr[^0-9a-z]/) { - $maxsize = $padsize = 440; + $maxsize = 440; } elsif ($file =~ /^gptmbr[^0-9a-z]/) { - $maxsize = $padsize = 440; + $maxsize = 440; } elsif ($file =~ /...

Hi, H. Peter Anvin: > It means that the .iso can be booted from a partition using any of the > standard MBRs (not necessarily altmbr), But the --partok MBRs (isohdpp*) stem from altmbr ? If so: don't they need the partition number patched in ? (If not: i have to rethink the link to article "Mbr" at http://www.syslinux.org/wiki/index.php/Isohybrid#MBR_selection ) > One of the main uses is for backup partit...

...unfortunately means that the isohybrid handoff protocol has changed, so the isohybrid utility must version-match isolinux.bin. * Drop support for ACPI 3 extended memory flags. * Menu system: don't set the autocr flag on the serial console. * altmbr: fix handling of logical partitions. * altmbr: cap at 439 bytes so the partition select byte isn't part of the file. Begin3 Title: syslinux Version: 3.81 Entered-date: 2009-05-29 Description: SYSLINUX is a collection of boot loaders for the Linux...

...f=MBRbackup.bin) and I installed the syslinux MBR. I tried several ways: - with the script provided by Arch: syslinux-install_update -i -a -m - manual method with mbr.bin (first setting the boot flag on /dev/sda3): dd if=/usr/lib/syslinux/bios/mbr.bin bs=440 count=1 of=/dev/sda - manual method with altmbr.bin: printf '\x3' | cat /usr/lib/syslinux/bios/altmbr.bin - | dd bs=440 count=1 iflag=fullblock conv=notrunc of=/dev/sda No luck any way. Then I just restored the Microsoft MBR. On 22/01/2014, Gene Cumm <gene.cumm at gmail.com> wrote: > On Tue, Jan 21, 2014 at 7:42 AM, David de M...

Hello Gene, thanks for your reply. Yes BIOS mode. The config wants a menu, which loads fine under ext4 and not under btrfs. Under btrfs I have also tried to remove the syslinux.cfg file altogether (which should trigger the boot: prompt if I am not mistaken) and the result is the same: only the copyright line appears and no prompt. The three letter sequence is EDD. The disk is 160GB, here is the

...eferable. Thus, maybe each relevant "cat" command mentioned in the documentation should be replaced by a reference to read the appropriate document regarding the MBR, where all the details and the recommended method (not only "cat") are explained. 5_ The code in "./mbr/altmbr*.*" has been corrected in Syslinux 4.06. Earlier altmbr code was always setting the first partition as active, so users using versions prior to 4.06 (most current distros by the time I'm writing this) should use the new code. Maybe this correction should be mentioned in the changelog f...

...unfortunately means that the isohybrid handoff protocol has changed, so the isohybrid utility must version-match isolinux.bin. * Drop support for ACPI 3 extended memory flags. * Menu system: don't set the autocr flag on the serial console. * altmbr: fix handling of logical partitions. * altmbr: cap at 439 bytes so the partition select byte isn't part of the file. Begin3 Title: syslinux Version: 3.82 Entered-date: 2009-06-09 Description: SYSLINUX is a collection of boot loaders for the Linux...

...le == "--help" or $file == "-h") { > + $usage = <<"END_USAGE"; > +Usage: $0 file [maxsize] > +If maxsize is not given it will be guessed based on filename: > + - 440 bytes for mbr and gptmbr; > + - 432 bytes for isohdp; > + - 439 bytes for altmbr. > +END_USAGE > + die $usage; > +} > > if (!defined($maxsize)) { > # Defaults based on the filename > if ($file =~ /^mbr[^0-9a-z]/) { > - $maxsize = $padsize = 440; > + $maxsize = 440; > } elsif ($file =~ /^gptmbr[^0-9a-z]/) { > - $maxsize = $pads...

...also says G or M if a GPT or MBR partition is detected. Signed-off-by: MartinS <ams at ludd.ltu.se> --- Comments? diff --git a/mbr/Makefile b/mbr/Makefile index be2bded..7095396 100644 --- a/mbr/Makefile +++ b/mbr/Makefile @@ -21,7 +21,8 @@ include $(MAKEDIR)/embedded.mk all: mbr.bin altmbr.bin gptmbr.bin isohdpfx.bin isohdppx.bin \ mbr_c.bin altmbr_c.bin gptmbr_c.bin isohdpfx_c.bin isohdppx_c.bin \ - mbr_f.bin altmbr_f.bin gptmbr_f.bin isohdpfx_f.bin isohdppx_f.bin + mbr_f.bin altmbr_f.bin gptmbr_f.bin isohdpfx_f.bin isohdppx_f.bin \ + isohdpfv.bin isohdppv.bin %.o: %.S...

...rnel (or memdisk) plus large initrd on such a system. * MBR: produce alternate MBR variants which force the drive number to hd0 (_f variants), or force the drive number to hd0 if the Ctrl key is pressed (_c variants.) Furthermore, add an MBR variant (altmbr*.bin) which ignores the active flag and instead boots the partition number specified in the byte at offset 439 decimal. -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.

Hi Syslinuxers, I am trying to understand the basic load chain in fat32 and ext4. I dug into the assembly for MBR, which is pretty straightforward: 1. Find boot partition (or use the pre-defined one at byte 440 for altmbr.bin) 2. Load the first 512-byte sector of the partition (VBR for fat32, Block Group 0 padding for ext). 3. Execute that code The code that is loaded, however, has to be too small (even if using entire 1024 bytes of padding in ext4) to understand ext4 and/or fat32, let alone find and read the sysli...

...USB drive with ArchLinux available, and we can keep comparing against your previous results. The image I have uploaded is for testing purposes only. Once extracted from the gzip archive, you get a 700MB test.img to be dd'ed to your USB device. The image includes a bootable MBR code ("altmbr.bin" from Syslinux), no "active" partition is set, one FAT32 (LBA) partition with a bootable SYSLINUX VBR, and some Syslinux c32 modules in it. Booting it, should show the Syslinux version, a "hello world" message and the Syslinux boot prompt. Please avoid using Gparte...

...via Syslinux <syslinux at zytor.com> wrote: > Hi Syslinuxers, > > I am trying to understand the basic load chain in fat32 and ext4. I dug > into the assembly for MBR, which is pretty straightforward: > > 1. Find boot partition (or use the pre-defined one at byte 440 for > altmbr.bin) > 2. Load the first 512-byte sector of the partition (VBR for fat32, Block > Group 0 padding for ext). > 3. Execute that code Yep. > The code that is loaded, however, has to be too small (even if using entire > 1024 bytes of padding in ext4) to understand ext4 and/or fat32, le...

...my MBR and > let syslinux overwrite it (yes I did set the boot flag before > installing syslinux and overwriting the MBR). That didn't make any > difference. Which MBR? How did you install it? The common Microsoft one can not boot a non-primary partition but the Syslinux mbr.bin and altmbr.bin can. -- -Gene A: Because it messes up the order in which people normally read text, especially the archives of mailing lists. Q: Why is Top-posting such a bad thing? "No one ever says, 'I can't read that ASCII(plain text) e-mail you sent me.'"