[syslinux] Getting classic BIOS and UEFI boot on the same disk?

Gregory Bartholomew gregory.lee.bartholomew at gmail.com
Sat Aug 31 11:19:40 PDT 2019

> Sounds good. What I did not find - maybe I'm not too deep in this topic -
>> will
>> the classic BIOS boot find a proper classic partition table? Or will it
>> find
>> only the GPT? The oldest system we have in operation has a AMI BIOS dated
>> 2004 -
>> will it be able to handle the GPT or do I need further modifications?
>> (I'll have the answer at last next week after trying it out :-))
I don't think the classic BIOS systems read the partition table at all.
Rather, they just load the first 440 bytes from the drive into memory and
copy the memory address that it was loaded to a CPU register. From there,
it is up to that 440 byte program to decipher the partition table. If you
use syslinux's gptmbr.bin, you should be fine.

P.S. Sorry for top-posting.

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