Hallo Herr Roger via Freedos-user, am Dienstag, 31. März 2026 um 17:21 schrieben Sie:
>> On Sun, Mar 29, 2026 at 06:45:37PM -0400, Karen Lewellen via Freedos-user >> wrote: >>My question was weather freedos has its own boot loader application. That is >>how freedos is related. > Boot sequence of legacy BIOS with MBR formated storage media (eg. hard > drive with formated MBR partition structures); 1) BIOS looks for MBR > activate partition, 2) BIOS then looks for executable boot code, for > example DOS IO.SYS/MSDOS.SYS, FreeDOS FDCONFIG.SYS/CONFIG.SYS, are then > loaded into memory and executed. Unfortunately this is complete nonsense. 1) BIOS reads the first sector (512 Byte) on the disk and executes it. 2) This code scans the partitiontable (part of the 512 Byte) for an active partition, then reads *this* sector and executes it. the MBR. 3) This sector - which is probably different for FAT12, FAT16, FAT32, EXTFS filesystems and OS. E.g. FreeDOS searches for "KERNEL.SYS", MSDOS searches for IO.SYS, loads it and executes it. 4) KERNEL.SYS is then responsible to locate FDCONFIG.SYS and FDAUTO.BAT, COMMAND.COM. > A decent DOS start execution process explanation can be found here: > DOS DAYS, "A Guide to DOS Startup Files" > https://www.dosdays.co.uk/topics/dos_startup.php only 50% accurate, unfortunately. > As for Rockbox, Rockbox hooks into the OEM firmware/bootloader loading > process. > Roger Mit freundlichen Grüßen / with kind regards Tom Ehlert +49-15151898538 _______________________________________________ Freedos-user mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freedos-user
