[syslinux] PATCH for Symbios/LSIlogic scsi and isolinux

[H. Peter Anvin]

Ruud wrote:
> Attached patch allows isolinux to boot from a CDROM attached to
> a NCR/Symbios/LSIlogic SCSI controller (bios version 4.19).
> 
> It appears this bios can't read more than 1 sector at the time using
> the ah=42h int13 call.  The isolinux boot was failing early on when
> 4 sector are read. (bios returned error 0 !)
> 
> I'm not sure if the same 'getlinsec' routine is called upon later to
> load the images selected by the user otherwise, for the 4 sector read,
> this change shouldn't have much impact on other systems.
> (boot speed was very fast).
> 

Good GOD!

This is just insane... CD-ROM BIOS with floppy-BIOS bugs... and 
returning error with no error code.  Really makes you wonder what the 
heck these people are smoking.

I might try to port the weird adaptive algorithm I started using for 
floppies.  Would you mind trying it out once I get done?

	-hpa



> Regards,
> 	Ruud L.
> 
> --- isolinux.asm.ORIG	Sat Jun  1 09:52:41 2002
> +++ isolinux.asm	Sun Jun  2 14:14:12 2002
> @@ -498,9 +498,9 @@
>  		mov [si+8],eax
>  .loop:
>  		push bp				; Sectors left
> -		cmp bp,byte 32
> +		cmp bp,byte 1			; 1 works for LSIlogic
>  		jbe .bp_ok
> -		mov bp,32
> +		mov bp,1
>  .bp_ok:
>  		mov [si+2],bp
>  		push si
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