Dell bios, how to decompose / mod.

Discussion in 'BIOS Mods' started by wolf69, Nov 21, 2009.

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  1. kizwan

    kizwan MDL Member

    Mar 6, 2010
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    #641 kizwan, Jul 6, 2011
    Last edited: Jul 6, 2011
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  2. WIND0WS 7

    WIND0WS 7 MDL Member

    Sep 28, 2009
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    #642 WIND0WS 7, Jul 6, 2011
    Oh s**t! I copied the text before, instead of the hex data thinking it was the same. That would explain all those "20"s! Lucky I didn't flash that huh? My bad. :eek:
     
  3. WIND0WS 7

    WIND0WS 7 MDL Member

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    #643 WIND0WS 7, Jul 6, 2011
    In my BIOS there's NO 48 byte HEADERS...

    BTW TYVM for spotting that error!
     
  4. WIND0WS 7

    WIND0WS 7 MDL Member

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    #644 WIND0WS 7, Jul 6, 2011
  5. en4rab

    en4rab MDL Novice

    Oct 27, 2009
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    #645 en4rab, Jul 6, 2011
  6. kizwan

    kizwan MDL Member

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    #646 kizwan, Jul 6, 2011
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  7. aascut

    aascut MDL Junior Member

    Feb 10, 2011
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    #647 aascut, Jul 6, 2011
  8. en4rab

    en4rab MDL Novice

    Oct 27, 2009
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    #648 en4rab, Jul 6, 2011
    Last edited by a moderator: Apr 20, 2017
    aascut i think the other changed bytes are the processor type string, I havent been able to find any code that references it and it appears to always be 4 bytes of ascii characters, this is the start of the microcode module in my dell 470:
    Code:
    Offset      0  1  2  3  4  5  6  7   8  9  A  B  C  D  E  F
00000000   07 00 34 0F 3A 00 30 44  43 4E 41 0F 0A 1C 30 45   ..4.:.0DCNA...0E
00000010   43 4E 42 0F DA 2F 30 47  43 4E 49 0F AA 3B 31 47   CNB.Ú/0GCNI.ª;1G
00000020   43 4E 48 0F 7A 43 30 41  58 50 43 0F 4A 4F 30 4E   CNH.zC0AXPC.JO0N
00000030   52 49 4A 0F 1A 57 30 52  52 49 7A 32 BF 9F 51 B4   RIJ..W0RRIz2¿ŸQ´
    The first entry you can see the CPUID, offset to start of microcode for this cpu, and 4 bytes of ascii "DCNA" which somehow relates to the type of cpu, i have a feelin this is somehow derived from nocona the name of the intel core.
     
  9. WIND0WS 7

    WIND0WS 7 MDL Member

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    #649 WIND0WS 7, Jul 6, 2011
    Excuse me?
     
  10. WIND0WS 7

    WIND0WS 7 MDL Member

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    #650 WIND0WS 7, Jul 6, 2011
  11. aascut

    aascut MDL Junior Member

    Feb 10, 2011
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    #651 aascut, Jul 6, 2011
    Last edited by a moderator: Apr 20, 2017
    Code:
    Original D4700A10.hdr
Offset      0  1  2  3  4  5  6  7   8  9  A  B  C  D  E  F

000379C0                                     12 00 24 0F 92                $ ’

New D4700A10.hdr
Offset      0  1  2  3  4  5  6  7   8  9  A  B  C  D  E  F

000378E0            12 00 24 0F 92                                 $ ’
    Why?
    Why did you put the header into update? It should not be inserted.
     
  12. WIND0WS 7

    WIND0WS 7 MDL Member

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    #652 WIND0WS 7, Jul 6, 2011
    Last edited by a moderator: Apr 20, 2017
    Where u got Original D4700A10.hdr from?
     
  13. WIND0WS 7

    WIND0WS 7 MDL Member

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    #653 WIND0WS 7, Jul 6, 2011
    Why in mine is earlier?
     
  14. WIND0WS 7

    WIND0WS 7 MDL Member

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    #654 WIND0WS 7, Jul 6, 2011
    kizwan that's copied from other Dell BIOS
     
  15. aascut

    aascut MDL Junior Member

    Feb 10, 2011
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    #655 aascut, Jul 6, 2011
    You're right. But there are nuances ...
    The length of the microcode update modules in your example is different, you can calculate it yourself.
     
  16. WIND0WS 7

    WIND0WS 7 MDL Member

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    #656 WIND0WS 7, Jul 6, 2011
    I'm confused. :weep:
     
  17. aascut

    aascut MDL Junior Member

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    #657 aascut, Jul 6, 2011
    Last edited by a moderator: Apr 20, 2017
    About microcode update header:
    Look to Wind0ws7 new D4700A10.hdr:
    Code:
    Offset      0  1  2  3  4  5  6  7   8  9  A  B  C  D  E  F

00042E40                  00 00 00  00 A1 00 00 00 01 00 02            Ў      
00042E50   00 08 00 00 00 0B 00 00  00 50 00 02 00 24 04 06            P   $  
00042E60   20 21 01 00 00 01 00 00  00 65 0F 00 00 00 00 00    !       e      
00042E70   00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00                   
00042E80   00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00                   
00042E90   00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00                   
00042EA0   00 00 00 00 00         
Where        Red is date YYYY/ MM/DD  
                Blue is CPUID
    Open manual ia32 software developer and read:
    header1.JPG
    Does anyone have any ideas about it? I think that is unnecessary zeros too much.
     
  18. WIND0WS 7

    WIND0WS 7 MDL Member

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    #658 WIND0WS 7, Jul 7, 2011
    Last edited: Jul 7, 2011
  19. kizwan

    kizwan MDL Member

    Mar 6, 2010
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    #659 kizwan, Jul 7, 2011
    Last edited by a moderator: Apr 20, 2017
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  20. WIND0WS 7

    WIND0WS 7 MDL Member

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    #660 WIND0WS 7, Jul 7, 2011
    I need an answer for these please:
    1. Have I modded my BIOS correctly?
    2. Why is aascut's offset (for my .hdr) at a different place in my .hdr? In mine it's 232 bytes behind.
    3. If BOTH CRC32 checksums are correct, yet I only patched one (at second last 4 bytes), why are people saying I must fix two?
     
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