Patchworkβ [coreboot] Dualbios on GA-MA770-UD3

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Submitter Vadim Girlin
Date 2010-04-09 15:08:21
Message ID <4BBF42E5.3030906@gmail.com>
Download mbox | patch
Permalink /patch/1211/
State Under Review
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Comments

Vadim Girlin - 2010-04-09 15:08:21
On 04/09/2010 04:18 PM, Carl-Daniel Hailfinger wrote:
> Hi Vadim,
>
> thanks for your mail. I have added the flashrom mailing list in CC:
> because we should develop a generic way to handle DualBIOS and similar
> techniques.
>
> On 09.04.2010 08:12, Vadim Girlin wrote:
>   
>> I'm going to try coreboot on Gigabyte GA-MA770-UD3.
>> It's AMD 770 (RX780 / SB700).
>>
>> My motherboard supports hardware dual bios - with two chips on it.
>> I'm going to try flashing backup chip and boot from it. It seems to be
>> possible - I've tested it (flashing at least). Chips on this board could
>> be switched by changing bit 0 at undocumented register EF on LDN 7 of
>> IT8720. I can use slightly patched flashrom for accessing any chip I
>> want without any problems. And this is tested many times.
>>
>> My idea is to use backup chip for debugging - that always keeps my
>> chance to reboot from main bios chip. And removes the need for
>> desoldering etc.
>>
>> And second problem is that original bios is checking second chip - and
>> trying to recover it by flashing the bios from main chip on reboot?
>> rewriting coreboot. AFAICS this could be solved by including some
>> signatures etc. It seems to be easy to find out. May be someone is
>> working on this?
>>
>> BTW I can send the patch for flashrom - but I think that with
>> information I mentioned above somebody could make it much better than my
>> ugly hack. I hope the regs should be the same for all latest Gigabyte
>> MBs using IT8720/18
>>   
>>     
> It would be great if you could send that patch. It will help us make a
> flashrom design decision that works for all boards with multiple flash
> chips.
>
>   
OK, I'm sending the patch for flashrom - but it is based on RE and needs
careful testing.
It works fine on GA-MA770-UD3 (rev 1.0) but should be tested with other MBs.
Anyway I hope it should work for all latest Gigabyte MBs with dual bios
chips connected through IT8720/18.
I think it's not ready for inclusion in flashrom - it probably should be
done in more safe and generic way.
Probably it should check for default values in regs etc.

It may be used as following:

flashrom -p it87spi:gbdualindex=0 ...
flashrom -p it87spi:gbdualindex=1 ...

This value needs to be set only once and further ops on selected chip
can be performed without parameters.



> By the way, some of us have good contacts at ITE, so we can ask ITE for
> details about the undocumented registers.
>   
That could be very helpful for me. This register (LDN 7 reg EF) seems to
be very interesting. Bit 0 is chip select, but also bits 2,4,5,6 are
used in bios code. Bit 6 probably is some watchdog setting - setting it
on  with resetting other bits causes reboot in ~ a second.

Also there is some moment in bios code about test reg 2F @ LDN F4 - it
is toggled in some place and this could be important - may be enabling
some undocumented features.

Another interesting moment is checking for status of RI2 event (LDN 4
reg F1 bit 1) - it's almost first op in bios startup code. AFAICS RI2
event causes switch to chip 1 (Backup) and reboot - but there is no COM2
port on that board. And settings at reg 29 after boot told me that RI2
pin is switched to GPIO mode. So it is probably some debugging feature -
if we find the way to set RI2 event then it seems to be an easy way to
boot from backup bios.

BTW all info I have on this is from it8718 datasheet, but it seems that
the code is same for 8718 and 8720.

Here is a dump of all regs of superio chip - may be it will help:

entered cfg
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B0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
C0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
D0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
E0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
F0   6  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
selected LDN 0x0B
     0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 
 0   0  0  0  0  0  0  0  B  0  0  0  0  0  0  0  0 
10   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
20  87 20  5 40 3A  0 10  0 40 80  0  0  1  0  0  0 
30   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
40   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
50   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
60   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
70   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
80   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
90   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
A0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
B0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
C0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
D0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
E0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
F0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
selected LDN 0x0C
     0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 
 0   0  0  0  0  0  0  0  C  0  0  0  0  0  0  0  0 
10   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
20  87 20  5 40 3A  0 10  0 40 80  0  0  1  0  0  0 
30   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
40   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
50   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
60   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
70   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
80   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
90   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
A0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
B0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
C0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
D0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
E0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
F0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
selected LDN 0x0D
     0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 
 0   0  0  0  0  0  0  0  D  0  0  0  0  0  0  0  0 
10   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
20  87 20  5 40 3A  0 10  0 40 80  0  0  1  0  0  0 
30   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
40   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
50   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
60   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
70   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
80   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
90   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
A0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
B0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
C0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
D0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
E0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
F0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
selected LDN 0x0E
     0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 
 0   0  0  0  0  0  0  0  E  0  0  0  0  0  0  0  0 
10   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
20  87 20  5 40 3A  0 10  0 40 80  0  0  1  0  0  0 
30   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
40   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
50   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
60   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
70   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
80   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
90   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
A0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
B0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
C0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
D0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
E0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
F0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
selected LDN 0x0F
     0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 
 0   0  0  0  0  0  0  0  F  0  0  0  0  0  0  0  0 
10   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
20  87 20  5 40 3A  0 10  0 40 80  0  0  1  0  0  0 
30   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
40   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
50   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
60   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
70   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
80   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
90   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
A0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
B0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
C0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
D0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
E0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
F0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
selected LDN 0xF4
     0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 
 0   0  0  0  0  0  0  0 F4  0  0  0  0  0  0  0  0 
10   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
20  87 20  5 40 3A  0 10  0 40 80  0  0  1  0  0  0 
30   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
40   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
50   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
60   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
70   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
80   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
90   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
A0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
B0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
C0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
D0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
E0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
F0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
left cfg


> Regards,
> Carl-Daniel
>
>
Rudolf Marek - 2010-04-09 15:56:15
> That could be very helpful for me. This register (LDN 7 reg EF) seems to
> be very interesting. Bit 0 is chip select, but also bits 2,4,5,6 are
> used in bios code. Bit 6 probably is some watchdog setting - setting it
> on  with resetting other bits causes reboot in ~ a second.

Hm the LDN 7 EF is not documented in old 0.4 version of datasheet.

> Also there is some moment in bios code about test reg 2F @ LDN F4 - it
> is toggled in some place and this could be important - may be enabling
> some undocumented features.

Yes no docs again,

> 
> Another interesting moment is checking for status of RI2 event (LDN 4
> reg F1 bit 1) - it's almost first op in bios startup code. AFAICS RI2
> event causes switch to chip 1 (Backup) and reboot - but there is no COM2
> port on that board. And settings at reg 29 after boot told me that RI2
> pin is switched to GPIO mode. So it is probably some debugging feature -
> if we find the way to set RI2 event then it seems to be an easy way to
> boot from backup bios.

This bit is marked reserved.

> BTW all info I have on this is from it8718 datasheet, but it seems that
> the code is same for 8718 and 8720.
> 

Hmm the LDN F4 is really some debug feature... Maybe someone should get new 
datasheet ;)

Rudolf


> Here is a dump of all regs of superio chip - may be it will help:
> 
> entered cfg
>      0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 
>  0   0  0  0  0  0  0  0 F4  0  0  0  0  0  0  0  0 
> 10   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 20  87 20  5 40 3A  0 10  0 40 80  0  0  1  0  0  0 
> 30   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 40   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 50   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 60   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 70   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 80   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 90   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> A0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> B0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> C0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> D0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> E0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> F0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> selected LDN 0x00
>      0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 
>  0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 10   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 20  87 20  5 40 3A  0 10  0 40 80  0  0  1  0  0  0 
> 30   1  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 40   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 50   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 60   3 F0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 70   6  2  0  0  2  4  0  0  0  0  0  0  0  0  0  0 
> 80   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 90   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> A0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> B0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> C0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> D0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> E0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> F0   0 80  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> selected LDN 0x01
>      0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 
>  0   0  0  0  0  0  0  0  1  0  0  0  0  0  0  0  0 
> 10   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 20  87 20  5 40 3A  0 10  0 40 80  0  0  1  0  0  0 
> 30   1  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 40   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 50   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 60   3 F8  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 70   4  2  0  0  4  4  0  0  0  0  0  0  0  0  0  0 
> 80   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 90   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> A0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> B0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> C0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> D0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> E0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> F0   0 50 50 50  0  0  0  0  0  0  0  0  0  0  0  0 
> selected LDN 0x02
>      0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 
>  0   0  0  0  0  0  0  0  2  0  0  0  0  0  0  0  0 
> 10   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 20  87 20  5 40 3A  0 10  0 40 80  0  0  1  0  0  0 
> 30   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 40   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 50   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 60   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 70   0  2  0  0  4  4  0  0  0  0  0  0  0  0  0  0 
> 80   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 90   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> A0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> B0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> C0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> D0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> E0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> F0   0 50 50 50  0  0  0  0  0  0  0  0  0  0  0  0 
> selected LDN 0x03
>      0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 
>  0   0  0  0  0  0  0  0  3  0  0  0  0  0  0  0  0 
> 10   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 20  87 20  5 40 3A  0 10  0 40 80  0  0  1  0  0  0 
> 30   1  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 40   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 50   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 60   3 78  0  0  0 80  0  0  0  0  0  0  0  0  0  0 
> 70   7  2  0  0  4  4  0  0  0  0  0  0  0  0  0  0 
> 80   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 90   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> A0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> B0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> C0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> D0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> E0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> F0   8  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> selected LDN 0x04
>      0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 
>  0   0  0  0  0  0  0  0  4  0  0  0  0  0  0  0  0 
> 10   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 20  87 20  5 40 3A  0 10  0 40 80  0  0  1  0  0  0 
> 30   1  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 40   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 50   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 60   2 28  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 70   0  2  0  0  4  4  0  0  0  0  0  0  0  0  0  0 
> 80   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 90   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> A0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> B0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> C0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> D0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> E0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> F0   8  8 2A 80 88 3E 1B  0  0  0  0  0  0  0  0  0 
> selected LDN 0x05
>      0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 
>  0   0  0  0  0  0  0  0  5  0  0  0  0  0  0  0  0 
> 10   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 20  87 20  5 40 3A  0 10  0 40 80  0  0  1  0  0  0 
> 30   1  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 40   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 50   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 60   0 60  0 64  0  0  0  0  0  0  0  0  0  0  0  0 
> 70   1  2  0  0  4  4  0  0  0  0  0  0  0  0  0  0 
> 80   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 90   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> A0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> B0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> C0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> D0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> E0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> F0  48  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> selected LDN 0x06
>      0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 
>  0   0  0  0  0  0  0  0  6  0  0  0  0  0  0  0  0 
> 10   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 20  87 20  5 40 3A  0 10  0 40 80  0  0  1  0  0  0 
> 30   1  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 40   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 50   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 60   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 70   C  2  0  0  4  4  0  0  0  0  0  0  0  0  0  0 
> 80   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 90   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> A0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> B0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> C0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> D0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> E0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> F0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> selected LDN 0x07
>      0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 
>  0   0  0  0  0  0  0  0  7  0  0  0  0  0  0  0  0 
> 10   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 20  87 20  5 40 3A  0 10  0 40 80  0  0  1  0  0  0 
> 30   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 40   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 50   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 60   0  0  2 20  2 38  0  0  0  0  0  0  0  0  0  0 
> 70   0  1  0 38  0  4  0  0  0  0  0  0  0  0  0  0 
> 80   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 90   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> A0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> B0   0  0  0  0  0  0  0  0 80  0  0 40  1  0  0  0 
> C0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> D0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> E0   0  0  0  0  0  0  0  0  0  0  0  0  0 3E 3E 7E 
> F0   0  0  0  0  0  0 26  0  0  0  0  0 8C  0  0  0 
> selected LDN 0x08
>      0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 
>  0   0  0  0  0  0  0  0  8  0  0  0  0  0  0  0  0 
> 10   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 20  87 20  5 40 3A  0 10  0 40 80  0  0  1  0  0  0 
> 30   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 40   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 50   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 60   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 70   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 80   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 90   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> A0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> B0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> C0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> D0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> E0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> F0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> selected LDN 0x09
>      0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 
>  0   0  0  0  0  0  0  0  9  0  0  0  0  0  0  0  0 
> 10   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 20  87 20  5 40 3A  0 10  0 40 80  0  0  1  0  0  0 
> 30   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 40   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 50   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 60   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 70   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 80   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 90   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> A0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> B0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> C0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> D0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> E0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> F0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> selected LDN 0x0A
>      0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 
>  0   0  0  0  0  0  0  0  A  0  0  0  0  0  0  0  0 
> 10   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 20  87 20  5 40 3A  0 10  0 40 80  0  0  1  0  0  0 
> 30   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 40   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 50   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 60   3 10  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 70   B  2  0  0  4  4  0  0  0  0  0  0  0  0  0  0 
> 80   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 90   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> A0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> B0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> C0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> D0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> E0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> F0   6  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> selected LDN 0x0B
>      0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 
>  0   0  0  0  0  0  0  0  B  0  0  0  0  0  0  0  0 
> 10   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 20  87 20  5 40 3A  0 10  0 40 80  0  0  1  0  0  0 
> 30   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 40   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 50   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 60   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 70   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 80   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 90   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> A0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> B0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> C0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> D0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> E0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> F0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> selected LDN 0x0C
>      0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 
>  0   0  0  0  0  0  0  0  C  0  0  0  0  0  0  0  0 
> 10   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 20  87 20  5 40 3A  0 10  0 40 80  0  0  1  0  0  0 
> 30   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 40   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 50   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 60   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 70   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 80   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 90   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> A0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> B0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> C0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> D0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> E0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> F0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> selected LDN 0x0D
>      0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 
>  0   0  0  0  0  0  0  0  D  0  0  0  0  0  0  0  0 
> 10   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 20  87 20  5 40 3A  0 10  0 40 80  0  0  1  0  0  0 
> 30   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 40   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 50   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 60   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 70   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 80   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 90   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> A0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> B0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> C0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> D0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> E0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> F0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> selected LDN 0x0E
>      0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 
>  0   0  0  0  0  0  0  0  E  0  0  0  0  0  0  0  0 
> 10   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 20  87 20  5 40 3A  0 10  0 40 80  0  0  1  0  0  0 
> 30   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 40   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 50   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 60   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 70   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 80   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 90   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> A0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> B0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> C0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> D0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> E0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> F0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> selected LDN 0x0F
>      0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 
>  0   0  0  0  0  0  0  0  F  0  0  0  0  0  0  0  0 
> 10   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 20  87 20  5 40 3A  0 10  0 40 80  0  0  1  0  0  0 
> 30   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 40   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 50   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 60   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 70   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 80   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 90   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> A0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> B0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> C0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> D0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> E0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> F0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> selected LDN 0xF4
>      0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 
>  0   0  0  0  0  0  0  0 F4  0  0  0  0  0  0  0  0 
> 10   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 20  87 20  5 40 3A  0 10  0 40 80  0  0  1  0  0  0 
> 30   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 40   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 50   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 60   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 70   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 80   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> 90   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> A0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> B0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> C0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> D0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> E0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> F0   0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0 
> left cfg
> 
> 
>> Regards,
>> Carl-Daniel
>>
>>   
> 
>
Rudolf Marek - 2010-04-09 16:05:18
> Also there is some moment in bios code about test reg 2F @ LDN F4 - it
> is toggled in some place and this could be important - may be enabling
> some undocumented features.

The test register is only RW when written from LDN F4.

Thanks,
Rudolf
Vadim Girlin - 2010-04-13 17:18:12
On 04/09/2010 08:05 PM, Rudolf Marek wrote:
>> Also there is some moment in bios code about test reg 2F @ LDN F4 - it
>> is toggled in some place and this could be important - may be enabling
>> some undocumented features.
> 
> The test register is only RW when written from LDN F4.
> 
> Thanks,
> Rudolf

Sorry, it seems that I should not send any dumps of bios code to this
list. It is mentioned on the page on flashrom.com - but not on the page
about mailing list on coreboot.com.

I've seen this only now. Probably you should mention it on the page
about mailing list on coreboot.com.

I hope it's not a big problem.
Carl-Daniel Hailfinger - 2010-04-13 19:06:15
On 13.04.2010 19:18, Vadim Girlin wrote:
> On 04/09/2010 08:05 PM, Rudolf Marek wrote:
>   
>>> Also there is some moment in bios code about test reg 2F @ LDN F4 - it
>>> is toggled in some place and this could be important - may be enabling
>>> some undocumented features.
>>>       
>> The test register is only RW when written from LDN F4.
>>
>>     
> Sorry, it seems that I should not send any dumps of bios code to this
> list. It is mentioned on the page on flashrom.com - but not on the page
> about mailing list on coreboot.com.
>
> I've seen this only now. Probably you should mention it on the page
> about mailing list on coreboot.com.
>
> I hope it's not a big problem.
>   

Logs and output from flashrom/superiotool/lspci are OK.
Only BIOS images ("dumps") retrieved with "flashrom -r" or downloaded
from the vendor website are problematic.

Regards,
Carl-Daniel

Patch

Index: it87spi.c
===================================================================
--- it87spi.c	(revision 992)
+++ it87spi.c	(working copy)
@@ -155,6 +155,28 @@ 
 				sio_write(port, 0x65, (flashport & 0xff));
 				free(portpos);
 			}
+
+			portpos = extract_param(&programmer_param,
+						"gbdualindex=", ",:");
+			if (portpos) {
+				int chip_index = strtol(portpos, (char **)NULL, 0);
+				if ((chip_index!=0) && (chip_index!=1))	{
+					msg_perr("Dual bios: Invalid chip index requested: %d\n",chip_index);
+					flashport=0;
+				} else {
+					tmp=sio_read(port,0xEF);
+					msg_pinfo("Dual bios: Current chip : %d\n",tmp&1);
+					if (chip_index!=(tmp&1)) {
+						sio_write(port,0xEF,(tmp&0xFE)|chip_index);
+						tmp=sio_read(port,0xEF)&1;
+						if (tmp!=chip_index) {
+							msg_perr("Dual bios: Chip selection failed.\n");
+							flashport=0;
+						} else msg_pinfo("Dual bios: Selected chip: %d\n",tmp&1);
+					}
+				}
+				free(portpos);
+			}
 		}
 		exit_conf_mode_ite(port);
 		break;