Re: [Qemu-devel] [5706] Implement LSI53C895A quirks exposed by OpenServer (Justin Chevrier).

[Ryan Harper <ryanh@us.ibm.com>]

* Justin Chevrier <theburner1@yahoo.com> [2008-11-25 00:13]:
> andrzej zaborowski wrote:
> 
> >He noticed that the patch uncovered an endiannes issue somewhere in
> >lsi53c895a.c due to which the comparison that we added doesn't work on
> >some target/host pairs.  This is the issue that should be fixed next.
> 
> I've done some more testing. I believe the line in question is wrong
> and wasn't the right way to fix the original problem I was seeing with
> Openserver. The original problem I observered in Openserver was that
> it was sending an Inquiry with an allocation length of 40 to the scsi
> drive but only got a reponse of length 36 (hardcoded in scsi-disk.c).
> This caused it to panic.
> 
> The patch below reverses this line and modifies scsi-disk.c to handle
> different length Inquiry commands. Tested in Openserver and in debian
> ARM from: (http://people.debian.org/~aurel32/qemu/armel).
> 
> Give it a shot, hopefully it doesn't break anything.

Yeah, that works just fine.

> 
> Justin
> 
> --- hw/scsi-disk.c      (revision 5793)
> +++ hw/scsi-disk.c      (working copy)
> @@ -492,7 +492,7 @@
>                       "is less than 36 (TODO: only 5 required)\n", len);
>              }
>          }
> -       memset(outbuf, 0, 36);
> +       memset(outbuf, 0, len);
> 
>          if (lun || buf[1] >> 5) {
>              outbuf[0] = 0x7f;  /* LUN not supported */
> @@ -510,10 +510,10 @@
>             Some later commands are also implemented. */
>         outbuf[2] = 3;
>         outbuf[3] = 2; /* Format 2 */
> -       outbuf[4] = 31;
> +       outbuf[4] = len - 5; /* Len(n - 4) */

Is there a better explanation that could be put here?


-- 
Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx
ryanh@us.ibm.com