Forum RSS Feed Follow @ Twitter Follow On Facebook

Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
[-]
Welcome
You have to register before you can post on our site.

Username:


Password:





[-]
Latest Threads
issues dumping bios
Last Post: Mrgraysky
Today 06:56 PM
» Replies: 0
» Views: 8
[REQUEST] Lenovo Z410 & Z510 (8DCNxxWW) ...
Last Post: bishoy
Today 01:35 PM
» Replies: 499
» Views: 212003
[REQUEST] ThinkPad E15 Gen 2 - BIOS Upda...
Last Post: Ronin314Clear
Yesterday 06:19 PM
» Replies: 0
» Views: 175
[REQUEST] Asus Zenbook (UM535QE) Bios M...
Last Post: Bravo6
Yesterday 03:41 AM
» Replies: 0
» Views: 279
OptiPlex 360 380 760 780 960 Xeon LGA 77...
Last Post: LoFabio
Yesterday 03:38 AM
» Replies: 265
» Views: 331274
[REQUEST] Asus G614JV BIOS Unlock
Last Post: Mrgraysky
Yesterday 01:02 AM
» Replies: 0
» Views: 202
[REQUEST] HP Compaq nx6120 WiFi Whitelis...
Last Post: Maxinator500
07-16-2025 09:24 PM
» Replies: 1
» Views: 276
[REQUEST] Acer Nitro 5 AN517-52 BIOS Unl...
Last Post: Dudu2002
07-16-2025 03:50 AM
» Replies: 24
» Views: 10621
[REQUEST] Acer Nitro ANV15-51 BIOS Unloc...
Last Post: Dudu2002
07-16-2025 01:14 AM
» Replies: 3
» Views: 238
[REQUEST] Lenovo Yoga S940-14IIL (BQCNxx...
Last Post: Dudu2002
07-15-2025 03:09 AM
» Replies: 1
» Views: 442
[REQUEST] Lenovo G400S (7BCNxxWW) Whitel...
Last Post: helrobsil
07-14-2025 09:10 PM
» Replies: 217
» Views: 113004
[REQUEST] Lenovo Ideapad S510p (89CNxxWW...
Last Post: Dudu2002
07-14-2025 12:04 PM
» Replies: 181
» Views: 92284
[REQUEST] GA-8I865GME-775-RH (rev. 3.9) ...
Last Post: DeathBringer
07-14-2025 01:48 AM
» Replies: 3
» Views: 714
i7 2860QM how to raise power limit?
Last Post: DeathBringer
07-13-2025 07:43 AM
» Replies: 12
» Views: 934
[REQUEST] Dell Wyse 3040: CSM enable for...
Last Post: mm400
07-13-2025 05:58 AM
» Replies: 1
» Views: 840
[REQUEST] Acer TravelMate 5760(G,Z) BIOS...
Last Post: quibic
07-12-2025 01:03 AM
» Replies: 49
» Views: 26947
Asus P8Z77-M RT-d Unlock
Last Post: cbaldwin1
07-11-2025 04:21 PM
» Replies: 0
» Views: 626
[REQUEST] Lenovo Yoga 530-14ARR (8MCNxxW...
Last Post: Dudu2002
07-11-2025 02:04 PM
» Replies: 4
» Views: 3300
[REQUEST] Gigabyte GA-X99P-SLI BIOS with...
Last Post: DKisCRUSHIN
07-11-2025 09:50 AM
» Replies: 0
» Views: 649
Acer Aspire 5920G - Requesting Modded BI...
Last Post: EbrahimSiami
07-10-2025 02:56 PM
» Replies: 1
» Views: 557

bios disassembly
#1
hi, i'm trying to dissassemble my old P3 mainboard bios for understanding the compatibility issue with a modern graphics card. I'm using IDA disassembler. Can someone tell me what I/O port EB refers to and also help me understand the purpose of the assembly instructions (start of bootblock) given below?

seg001:E45C mov al, 0BDh ;
seg001:E45E mov ah, al
seg001:E460 out 70h, al ; CMOS Memory:
seg001:E460 ;
seg001:E462 out 0EBh, al
seg001:E464 mov al, 55h ;
seg001:E466 out 71h, al ; CMOS Memory:
seg001:E466 ;
seg001:E468 xchg ah, al
seg001:E46A out 70h, al ; CMOS Memory:
find
quote
#2
hi,
i have identified one probable cause of the incompatibility though not 100% sure. my motherboard(award ver 6.00) bios is not properly identifying device BAR's if it is a combination of 'Prefetchable' type and '64 bit decoder' while pci enumeration. i have checked motherboard bios(award/phoenix) upto year 2004 and still found the same coding. am i correct in assuming that all the graphics cards manufactured upto 2004 were not having any BAR's in 64 bit memory space? Can i get a confirmation from someone in this regard so that i can mod by bios?.

thanks,
g.gandhi


(05-02-2013, 01:41 AM)gandhig Wrote: hi, i'm trying to dissassemble my old P3 mainboard bios for understanding the compatibility issue with a modern graphics card. I'm using IDA disassembler. Can someone tell me what I/O port EB refers to and also help me understand the purpose of the assembly instructions (start of bootblock) given below?

seg001:E45C mov al, 0BDh ;
seg001:E45E mov ah, al
seg001:E460 out 70h, al ; CMOS Memory:
seg001:E460 ;
seg001:E462 out 0EBh, al
seg001:E464 mov al, 55h ;
seg001:E466 out 71h, al ; CMOS Memory:
seg001:E466 ;
seg001:E468 xchg ah, al
seg001:E46A out 70h, al ; CMOS Memory:
find
quote
#3
hi, i'm really happy to share that at last the modern graphics card got detected by my old motherboard bios after i modded it to introduce a delay and a patch for proper handling of 64 bit prefetchable memory request by a pci device in the awardext.rom module.
find
quote


Forum Jump:


Users browsing this thread: