search for: 14eca14

...ecpercyl = (stack-24) Yes. It is. However by now we know that that correction is wrong. You need to revert that and use the one in <http://www.syslinux.org/archives/2017-March/025706.html>. Here pasted (so might not apply cleanly): diff --git a/mbr/isohdpfx.S b/mbr/isohdpfx.S index 17e1efe..14eca14 100644 --- a/mbr/isohdpfx.S +++ b/mbr/isohdpfx.S @@ -151,7 +151,7 @@ next: /* Check to see if we have EBIOS */ pushw %dx /* drive number */ - movb $0x41, %ah /* %al == 0 already */ + movb $0x41, %ah movw $0x55aa, %bx xorw %cx, %cx xorb %d...

...it seems that previous choice was wrong and the declared offsets were correct. Thus a new patch that corrects the order of pushes (instead of offsets) _and_ setting CX to zero if EBIOS detection fails. Apply it to orginal syslinux code. diff --git a/mbr/isohdpfx.S b/mbr/isohdpfx.S index 17e1efe..14eca14 100644 --- a/mbr/isohdpfx.S +++ b/mbr/isohdpfx.S @@ -151,7 +151,7 @@ next: /* Check to see if we have EBIOS */ pushw %dx /* drive number */ - movb $0x41, %ah /* %al == 0 already */ + movb $0x41, %ah movw $0x55aa, %bx xorw %cx, %cx xorb %dh, %dh @@ -167,20 +167,22 @@ next: read_sec...

It is good to see this ----- Forwarded message from syslinux-bot for Martin Str|mberg <ams at ludd.ltu.se> ----- Date: Sat, 25 Mar 2017 05:54:09 -0700 From: syslinux-bot for Martin Str|mberg <ams at ludd.ltu.se> To: Syslinux commits mailing list <syslinux-commits at zytor.com> Cc: ams at ludd.ltu.se Subject: [syslinux:master] mbr/isohdpfx.S: correct pointer for heads/sectors

...s wrong and the declared offsets were correct. > > Thus a new patch that corrects the order of pushes (instead of > offsets) _and_ setting CX to zero if EBIOS detection fails. Apply it > to orginal syslinux code. > > diff --git a/mbr/isohdpfx.S b/mbr/isohdpfx.S > index 17e1efe..14eca14 100644 > --- a/mbr/isohdpfx.S > +++ b/mbr/isohdpfx.S > @@ -151,7 +151,7 @@ next: > > /* Check to see if we have EBIOS */ > pushw %dx /* drive number */ > - movb $0x41, %ah /* %al == 0 already */ > + movb $0x41, %ah >...

Hi, i am looking now at the code which i assume loads the rest of isolinux.bin. The entry point for program execution from the MBR is obviously at http://git.zytor.com/syslinux/syslinux.git/tree/core/isolinux.asm#n186 (Do i get it right that this is the Intel syntax ? (Gronfff)) If POP yields the victim of the most recent not yet popped PUSH, then this does not look correctly coordinated