From mboxrd@z Thu Jan  1 00:00:00 1970
From: cinap_lenrek@gmx.de (cinap_lenrek at gmx.de)
Date: Tue,  8 Mar 2011 10:24:48 +0100
Subject: [9fans] self modifying code in intel vga bios?
Message-ID: <80ac49ab88c41d7cef9e96285eeb4c1b@gmx.de>
Topicbox-Message-UUID: b8ba4428-ead6-11e9-9d60-3106f5b1d025

Fish- has catched this on a Intel(r)915GM/910ML/915MS Graphics Controller
with realemu:

bad mem write c0c11
bad memory access
1d17b0 4a008800 00000002 00000000 0000a002 00009000 00005108 ac007bda 00007bc0 0000 0000 0000 c000 csZoPdI 61ed c6 MOV CS:[c11], $01

question to the coreboot guys:

did you ever see the bios writing in the rom area? 

i found this quote on: http://www.coreboot.org/VGA_support

"Even if your VGA BIOS uses self-modifying code you get a correct image"

i know that the rom area is usualy cached in ram but to catch mistakes
i disallow writing to the rom area...  fish will make full traces
later this day...  it could be just a screwup on my side...
just curious :)

--
cinap