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BOOTMGR and new Linux installation (Users)

posted by bocke, 23.01.2025, 07:40

> I installed Slackware but I am not able to boot via BOOTMGR.
> If I want to select to boot from Linux partition the BOOTMGR does not even
> try to boot it but it beeps and restarts.
>
> I looked to the source doce of BOOTMGR and I believe that I found a quite
> problematic part in BOOTLOAD.INC:
>
> cmp word [LOADADR + PARTSIGN], ISVALIDPART  ; check if a valid
> jne error                                   ;   bootable partition
>
>
> ISVALIDPART = AA55
> PARTSIGN = 01FEh
>
> So, the BOOTMGR checks whether the partition has on offset 01FEh the value
> AA55h.
> If yes, the booting process continues, if no, it is evaluated as a non
> valid partiotion and the boot code is not run.
Uhm... According to this, AA55 at offset 01FEh should denote the end of MBR. That might mean no valid partition was found. If I'm reading that correct.

What motherboard is that? Does it have an UEFI BIOS or a legacy BIOS? How does your partiton layout looks? Which Slackware version did you install? 32bit or 64bit?

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