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The ldlinux.c32 file should be present in every Syslinux installation and should match the version of ldlinux.sys installed in the partition.
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Stage 3 - Load /boot/syslinux/ldlinux.c32 The /boot/syslinux/ldlinux.sys will load the /boot/syslinux/ldlinux.c32 (core module) that contains the rest of the core part of syslinux that could not be fit into ldlinux.sys (due to file-size constraints). Therefore, in Btrfs the entire ldlinux.sys code is embedded in the space following the VBR and is not installed at /boot/syslinux/ldlinux.sys unlike the case of other filesystems. Note: In the case of Btrfs, the above method will not work since files move around resulting in changing of the sector location of ldlinux.sys. The sector location of /boot/syslinux/ldlinux.sys should not change, otherwise syslinux will not boot. Stage 2 - Part 2 - Execute /boot/syslinux/ldlinux.sys The VBR will load the rest of /boot/syslinux/ldlinux.sys. Note that ldlinux.sys is not the same as ldlinux.c32. In the case of Syslinux, the VBR boot code is the starting sector of /boot/syslinux/ldlinux.sys which is created by the extlinux -install command. Stage 2 - Part 1 - Execute volume boot record The Stage 1 MBR boot code executes the Volume Boot Record (VBR) of the /boot partition. Let us assume this is the /boot partition, for example. Stage 1 - Part 2 - Search active partition The Stage 1 MBR boot code looks for the partition that is marked as active (boot flag in MBR disks). Stage 1 - Part 1 - Load MBR At boot, the BIOS loads the 440 byte MBR boot code at the start of the disk ( /usr/lib/syslinux/bios/mbr.bin or /usr/lib/syslinux/bios/gptmbr.bin). Syslinux boot process on BIOS happens in stages: After installing the relevant package(s), the bootloader code itself needs to be installed (to the adequate area, usually the VBR or ESP) so to be able to boot the system the following sections provide alternative instructions depending on the characteristics of your particular system. Installing the package is not the same as installing the bootloader. UEFI booting requires installing the efibootmgr package. InstallationīIOS booting will also require the gptfdisk package for BIOS/GPT setups and mtools if your /boot partition is FAT-formatted. See #Chainloading on how to work around this. Note: Syslinux, by itself, cannot access files from partitions other than its own.