r779 - cpu/x86/pc/olpc

Author: wmb
Date: 2008-01-18 07:49:42 +0100 (Fri, 18 Jan 2008)
New Revision: 779

Modified:
   cpu/x86/pc/olpc/mfgdata.fth
Log:
OLPC trac 6080 - Fixed bug in mfg data tag scanner that was causing the
keyboard driver to crash with a stack underflow when looking for the KA tag
in a mfg data area that had been corrupted with a malformed long-data
tag.  The bug was a "3drop" that should have been a "2drop".

Modified: cpu/x86/pc/olpc/mfgdata.fth
===================================================================
--- cpu/x86/pc/olpc/mfgdata.fth	2008-01-17 09:19:13 UTC (rev 778)
+++ cpu/x86/pc/olpc/mfgdata.fth	2008-01-18 06:49:42 UTC (rev 779)
@@ -13,7 +13,7 @@
       dup  4 - c@  dup h# 80 and  if  drop true exit  then   ( adr low )
       over 5 - c@  dup h# 80 and  if  2drop true exit  then  ( adr low high )
       2dup xor h# ff xor                                     ( adr low high check )
-      3 pick 3 - c@ <>  if  3drop true exit  then            ( adr low high )
+      3 pick 3 - c@ <>  if  2drop true exit  then            ( adr low high )
       7 << +                                                 ( adr length )
       - 5 -                                                  ( data-adr )
    else           \ Short (4-byte tag) format