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andy17d
 Post subject: WD ROM from SA - checksum
PostPosted: July 1st, 2015, 6:11 
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Joined: May 14th, 2015, 18:29
Posts: 75
Location: Poland
I'm trying to rebuild rom from sa modules.

I found this tutorial: http://www.hddoracle.com/viewtopic.php?f=59&t=225

Unfortunately, I do not know how to count checksum for each modules.

Checksum is located at 0x0C - 0x0F in each modules.
So how to calulate that value? Should I write 00 00 00 00 and the calculate or calculate on original sa module?
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pepe
 Post subject: Re: WD ROM from SA - checksum
PostPosted: July 2nd, 2015, 9:23 
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Location: Hungary
Just checked, it is a simle 32bit checksum.
U need to set it up so that the sum of all dwords in the module is 0.

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andy17d
 Post subject: Re: WD ROM from SA - checksum
PostPosted: July 2nd, 2015, 11:31 
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Not so simple for me :(

For example, I take mod 107

Code:
Offset(h) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11

00000000  52 4F 59 4C 04 00 1E 00 07 01 01 00 03 C8 F8 C5 30 30  ROYL.........ÈøÅ00
00000012  30 32 30 30 30 30 00 00 00 00 00 00 06 12 01 0A 00 3E  020000
00000024  00 00 19 00 00 B2 FF 02 00 00 00 00 00 12 01 0B 00 D1
00000036  00 00 19 00 00 E1 FE 02 00 00 00 00 00 12 01 30 00 00
00000048  04 00 19 00 00 E1 FA 02 00 00 00 00 00 12 01 47 00 00
0000005A  04 00 19 00 00 20 F3 02 00 00 00 00 00 12 01 0D 00 84
0000006C  00 00 19 00 00 9C F2 02 00 00 00 00 00 12 01 4F 00 E0
0000007E  00 00 19 00 00 20 F7 02 00 00 00 00 00 46 06 FF 0F 3F
00000090  00 26 8C 02 00 00 00 00 00 26 8C 02 00 E2 6F 03 00 26
000000A2  8C 02 00 C4 DF 06 00 26 8C 02 00 A6 4F 0A 00 26 8C 02
000000B4  00 88 BF 0D 00 26 8C 02 00 6A 2F 11 00 00 00 00 00 00


First, I have to change ID (0x06 and 0x07) : 07 01 --> 0B 00

Code:
Offset(h) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11

00000000  52 4F 59 4C 04 00 1E 00 0B 00 01 00 03 C8 F8 C5 30 30  ROYL.........ÈøÅ00



What next?

Should I calculate 32bit checksum for mod 102 with changed ID?
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fzabkar
 Post subject: Re: WD ROM from SA - checksum
PostPosted: July 2nd, 2015, 14:58 
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The checksum is 32-bit little endian.

Make the required changes to the module, calculate the 32-bit sum, and then subtract this sum from the checksum dword.

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andy17d
 Post subject: Re: WD ROM from SA - checksum
PostPosted: July 3rd, 2015, 4:08 
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Posts: 75
Location: Poland
fzabkar wrote:
Make the required changes to the module, calculate the 32-bit sum, and then subtract this sum from the checksum dword.

So, I calculated checksum (by chksum2) for my changed module: 0xFFFFFF08
Present checksum in module is: 53 51 C2 64.
If I understood correctly, I now subtract new checksum from the current, that is 0x64C25153 - 0xFFFFFF08 = 0x64C2524B (dword)
New checksum is 4B 52 C2 64. I checked chechsum for whole module and is 0x00000000. Success :)
Thank you for help!
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andy17d
 Post subject: Re: WD ROM from SA - checksum
PostPosted: July 3rd, 2015, 4:43 
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Posts: 75
Location: Poland
I converted module 103 into 047 and the sum of the these modules is different

047 from 103 module
Quote:
52 4F 59 4C 01 00 1E 00 47 00 02 00 FD 20 1D 78


org 047 module
Quote:
52 4F 59 4C 01 00 1E 00 47 00 02 00 03 26 26 7F


Is it correct?
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pepe
 Post subject: Re: WD ROM from SA - checksum
PostPosted: July 3rd, 2015, 5:05 
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Joined: October 3rd, 2005, 0:40
Posts: 4753
Location: Hungary
do the module contents look identical?

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andy17d
 Post subject: Re: WD ROM from SA - checksum
PostPosted: July 3rd, 2015, 5:13 
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Joined: May 14th, 2015, 18:29
Posts: 75
Location: Poland
pepe wrote:
do the module contents look identical?


Yes

047 from 103 module
Code:
52 4F 59 4C 01 00 1E 00 47 00 02 00 FD 20 1D 78 44 58 2E 30 30 33 32 20 07 07 07 00 30 00 80 01 A0 01 00 00 00 00 00 00 00 00 00 00 00 00 37 4B A0 45 20 80 71 12 0F 0E 0F 0F AE B0 8C 05 65 01 40 4F C0 02 04 0C 19 56 14 E0 EE FF FD 10 78 C0 16 2D 3E 20 00 00 00 20 00 00 80 45 20 80 71 10 0F 11 0E 11 AE B0 8C 05 65 01 40 6A C0 04 05 0E 19 56 16 DF EA FD FC 00 78 C0 16 2D 3E 20 00 00 00 20 00 00 C0 45 20 80 71 10 0F 0F 10 0F AE B0 8C 05 65 01 40 5B C0 02 05 0C 1E 56 11 DF ED FE FD 00 78 C0 16 2D 3E 3E 00 00 00 20 00 00 E0 45 24 80 71 10 0F 0E 0E 0E AE B0 8C 05 65 01 40 60 C0 02 04 0A 1E 56 13 DB EB FE FD 00 00 C0 16 2D 3E 20 00 00 00 20 00 00 E0 45 20 80 71 11 0F 0F 10 10 AE B0 8C 05 65 01 40 5F C0 01 03 09 19 56 19 DE EA FE FD 00 00 C0 16 2D 3E 3A 00 00 00 20 00 00 A0 45 20 80 71 12 0F 0F 0F 10 AE B0 8C 05 65 01 40 67 C0 03 04 0C 19 56 12 DC EA FE FC 00 00 C0 16 2D 3E 20 00 00 00 20 00 00 C0 45 20 80 71 00 0F 05 0F 05 AE B0 8C 05 65 01 40 80 C0 02 03 0B 14 56 FF DE F0 FF FB 00 00 C0 16 2D 3E 20 00 00 00 20 00 00 C0 45 20 80 71 00 0F 05 0F 05 AE B0 8C 05 65 01 40 80 C0 02 03 0B 14 56 FF DE F0 FF FB 00 00 C0 16 2D 3E 20 00 00 00 20 00 00 0F 72 0A 04 0C 60 08 04 0C 63 0A 05 0F 62 0A 06 0C 72 08 06 13 72 0B 03 00 A0 0A 05 00 A0 0A 05 20 0A 6D 0A 1D 0A 74 0A 25 0A 8E 0A 0A 0A 0A 0A 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 81 01 11 00 12 00 11 00 12 00 11 00 12 00 00 00 00 00 01 00 1E 01 39 39 39 39 39 39 39 39 42 3D 42 00 3D 42 3F 3A 3F 00 3A 3F 42 3E 42 00 3E 42 40 3B 40 00 3B 40 43 40 43 00 40 43 44 40 44 00 40 44 3B 34 3B 00 34 3B 3B 34 3B 00 34 3B 00 00 00 00 00 00 12 FD FF FF 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 06 00 00 00 00 00 88 0B 88 0A 88 0A 88 0A 88 0A 88 0A 88 09 88 09 5B 01 03 00 5D 01 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 47 53 4C 54 4C 50 50 58 60 60 7E 7D 7E 7F 7E 78 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00


org 047 module
Quote:
52 4F 59 4C 01 00 1E 00 47 00 02 00 03 26 26 7F 44 58 2E 30 30 33 32 20 07 07 07 00 30 00 80 01 A0 01 00 00 00 00 00 00 00 00 00 00 00 00 37 4B A0 45 20 80 71 12 0F 0E 0F 0F AE B0 8C 05 65 01 40 4F C0 02 04 0C 19 56 14 E0 EE FF FD 10 78 C0 16 2D 3E 20 00 00 00 20 00 00 80 45 20 80 71 10 0F 11 0E 11 AE B0 8C 05 65 01 40 6A C0 04 05 0E 19 56 16 DF EA FD FC 00 78 C0 16 2D 3E 20 00 00 00 20 00 00 C0 45 20 80 71 10 0F 0F 10 0F AE B0 8C 05 65 01 40 5B C0 02 05 0C 1E 56 11 DF ED FE FD 00 78 C0 16 2D 3E 3E 00 00 00 20 00 00 E0 45 24 80 71 10 0F 0E 0E 0E AE B0 8C 05 65 01 40 60 C0 02 04 0A 1E 56 13 DB EB FE FD 00 00 C0 16 2D 3E 20 00 00 00 20 00 00 E0 45 20 80 71 11 0F 0F 10 10 AE B0 8C 05 65 01 40 5F C0 01 03 09 19 56 19 DE EA FE FD 00 00 C0 16 2D 3E 3A 00 00 00 20 00 00 A0 45 20 80 71 12 0F 0F 0F 10 AE B0 8C 05 65 01 40 67 C0 03 04 0C 19 56 12 DC EA FE FC 00 00 C0 16 2D 3E 20 00 00 00 20 00 00 C0 45 20 80 71 00 0F 05 0F 05 AE B0 8C 05 65 01 40 80 C0 02 03 0B 14 56 FF DE F0 FF FB 00 00 C0 16 2D 3E 20 00 00 00 20 00 00 C0 45 20 80 71 00 0F 05 0F 05 AE B0 8C 05 65 01 40 80 C0 02 03 0B 14 56 FF DE F0 FF FB 00 00 C0 16 2D 3E 20 00 00 00 20 00 00 0F 72 0A 04 0C 60 08 04 0C 63 0A 05 0F 62 0A 06 0C 72 08 06 13 72 0B 03 00 A0 0A 05 00 A0 0A 05 20 0A 6D 0A 1D 0A 74 0A 25 0A 8E 0A 0A 0A 0A 0A 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 81 01 11 00 12 00 11 00 12 00 11 00 12 00 00 00 00 00 01 00 1E 01 39 39 39 39 39 39 39 39 42 3B 42 00 3B 42 3E 39 3E 00 39 3E 42 3C 42 00 3C 42 40 3A 40 00 3A 40 42 3E 42 00 3E 42 43 3F 43 00 3F 43 3B 34 3B 00 34 3B 3B 34 3B 00 34 3B 00 00 00 00 00 00 12 FD FF FF 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 06 00 00 00 00 00 88 0B 88 0A 88 0A 88 0A 88 0A 88 0A 88 09 88 09 5B 01 03 00 5D 01 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 47 53 4C 54 4C 50 50 58 60 60 7E 7D 7E 7F 7E 78 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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andy17d
 Post subject: Re: WD ROM from SA - checksum
PostPosted: July 3rd, 2015, 8:37 
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Posts: 75
Location: Poland
pepe wrote:
do the module contents look identical?


Yes, IMHO modules look indentical.
I attached oryginal 047 module, 103 module and my work, that is 047 rebuild from 103.


Attachments:
a.zip [1.42 KiB]
Downloaded 810 times
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pepe
 Post subject: Re: WD ROM from SA - checksum
PostPosted: July 3rd, 2015, 8:57 
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Joined: October 3rd, 2005, 0:40
Posts: 4753
Location: Hungary
BTW, why do u want to rebuild original 47 if u have it?

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pepe
 Post subject: Re: WD ROM from SA - checksum
PostPosted: July 3rd, 2015, 9:19 
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Joined: October 3rd, 2005, 0:40
Posts: 4753
Location: Hungary
47 and 103 is not identical, there are differences from offset 1E3, so the resulting module's checksum has to differ from your orig 47

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andy17d
 Post subject: Re: WD ROM from SA - checksum
PostPosted: July 3rd, 2015, 9:25 
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Joined: May 14th, 2015, 18:29
Posts: 75
Location: Poland
pepe wrote:
BTW, why do u want to rebuild original 47 if u have it?


I learn on the basis of pre-made example.
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andy17d
 Post subject: Re: WD ROM from SA - checksum
PostPosted: July 16th, 2015, 7:41 
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Joined: May 14th, 2015, 18:29
Posts: 75
Location: Poland
I have one more question.

There is writen that "MOD 104 matches the MOD 0D template in MOD 109. However, the actual content of MOD 0D in ROM is significantly different. "
in the tutorial: http://www.hddoracle.com/viewtopic.php?f=59&t=761

Is spite of these differences rebuilt ROM will be good?
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fzabkar
 Post subject: Re: WD ROM from SA - checksum
PostPosted: July 16th, 2015, 19:36 
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Module 0D contains informational stuff like the firmware version, world wide name (WWN) and sometimes the model number and serial number. I believe that you can change any of these parameters without affecting the access to your data.

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