Hello, OKUJI!
> > Apprarently, get_diskinfo_standard (INT 13 AH=8h) returns success for
> > every drive (Intel 440ZX, Award BIOS)
>
> Can you test this patch?
Your patch doesn't work, but I like your style :-)
Award BIOS returns zero values for the geometry, but it doesn't consider
this as an error.
This means that the carry flag is not set for non-existing disks.
Number of sectors may not be 0 for a valid disk, because sectors are
numbered beginning with 1.
Following patch works for me:
Index: asm.S
===================================================================
RCS file: /gd/gnu/anoncvsroot/grub/stage2/asm.S,v
retrieving revision 1.3
diff -u -r1.3 asm.S
--- asm.S 1999/06/27 08:34:45 1.3
+++ asm.S 1999/07/30 06:32:44
@@ -596,6 +596,14 @@
.code16
movb $0x8, %ah
int $0x13 /* do the operation */
+ testb %ah, %ah
+ jnz 1f
+ /* bogus BIOSes may not return an error number */
+ testb $0x3f, %cl /* 0 sectors means no disk */
+ jnz 1f /* if non-carrier, then succeed */
+ /* XXX 0x60 is one of the unused error numbers */
+ movb $0x60, %ah
+1:
movb %ah, %bl /* save return value in %bl */
/* back to protected mode */
data32
===================================================================
Pavel Roskin
