search for: sect1ptr1_val

git://git.zytor.com/users/genec/syslinux.git Branch core-diskstart-boot-for-hpa. I found that INT 13h AH 08h in BOCHS used ES, DI, at least when using a partitionless HDD, causing "Boot error" from the magic check as it was loaded to the wrong location. HPA suggested wrapping INT 13h with the push/pop for ES's safety. This then lead to checking over for all int 13h calls in

...s "libinstaller/syslxmod.c" to modify the content (boot sector and ldlinux). > The question, is there a way to simulate the work that syslinux does > in a reasonably supportable way that won't break on future updates of > syslinux? > > Rich. > The Sect1Ptr0_VAL and Sect1Ptr1_VAL magic values didn't change in almost a decade. So a simple search and replace approach should work for a while. On the other hand the required offsets are embedded in "ldlinux.sys" (Sect1Ptr0, Sect1Ptr1 with Sect1Ptr0Ptr and Sect1Ptr1Ptr in the extended patch area). Since "ldlinu...

I'm trying to add boot support to https://github.com/libguestfs/nbdkit/tree/master/plugins/floppy This NBD server plugin generates a completely virtual FAT filesystem and partition table. Nothing is ever written to a file, and it must run without anything needing to be root, loop mounting etc. Running "syslinux --install <something>" is a non-starter. So I've looked at