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Dell PowerEdge BMC challenge
#1
Star 
Hey,

I am looking for help with a very specific problem. I need to change certain fan thresholds on my Dell PowerEdge 2800 server. The thresholds seem to be defined in the BMC bios (the BMC is like a separate computer that runs along the server and is used for management&monitoring).

I have the flash here, and it does not seem to be compressed (I can get clear-text strings from it). The file starts of with the following header:

Code:
0000000: 0210 99f7 0500 0000 4445 4c4c 5f49 4e43  ........DELL_INC
0000010: 0000 0300 0000 0000 0183 d5bc c41b 0000  ................
0000020: 4103 0000 4242 2e46 4c43 0000 0000 0000  A...BB.FLC......
0000030: 0000 0000 0000 0000 0000 0000 0000 0000  ................
0000040: 0000 0000 0006 0000 0000 0001 83d6 2944  ..............)D
0000050: 6f05 0005 1f00 004f 422e 464c 4300 0000  o......OB.FLC...
0000060: 0000 0000 0000 0000 0000 0000 0000 0000  ................
0000070: 0000 0000 0000 0000 0900 0000 0000 0183  ................
0000080: 6716 1200 0000 498e 0500 4944 2e46 4c43  g.....I...ID.FLC
0000090: 0000 0000 0000 0000 0000 0000 0000 0000  ................
00000a0: 0000 0000 0000 0000 0000 000f 0000 0000  ................
00000b0: 0001 8334 ef6c 0500 005b 8e05 004f 454d  ...4.l...[...OEM
00000c0: 5f44 4546 2e46 4c43 0000 0000 0000 0000  _DEF.FLC........
00000d0: 0000 0000 0000 0000 0000 0000 0000 0b00  ................
00000e0: 0100 0000 0183 847c 0020 0000 c793 0500  .......|. ......  
00000f0: 5344 5f42 422e 464c 4300 0000 0000 0000  SD_BB.FLC.......    
0000100: 0000 0000 0000 0000 0000 0000 0000 0000  ................
0000110: 0004 0001 0000 0001 83cd cd3e 0000 00c7  ...........>....
0000120: b305 0046 495f 4242 2e46 4c43 0000 0000  ...FI_BB.FLC....
0000130: 0000 0000 0000 0000 0000 0000 0000 0000  ................
0000140: 0000 0000 0500 0100 0000 0183 33e1 4c00  ............3.L.
0000150: 0000 05b4 0500 544f 435f 4242 2e46 4c43  ......TOC_BB.FLC
0000160: 0000 0000 0000 0000 0000 0000 0000 0000  ................
0000170: 0000 0000 0000 0007 0001 0000 0001 83e8  ................
0000180: 90f6 0500 0051 b405 0049 4f5f 4242 2e46  .....Q...IO_BB.F
0000190: 4c43 0000 0000 0000 0000 0000 0000 0000  LC..............
00001a0: 0000 0000 0000 0000 0000 0800 0100 0000  ................
00001b0: 0183 455d e403 0000 47ba 0500 4953 5f42  ..E]....G...IS_B
00001c0: 422e 464c 4300 0000 0000 0000 0000 0000  B.FLC...........
00001d0: 0000 0000 0000 0000 0000 0000 000e 0001  ................
00001e0: 0000 0001 8339 0600 0600 002b be05 004f  .....9.....+...O
00001f0: 454d 5f42 422e 464c 4300 0000 0000 0000  EM_BB.FLC.......
0000200: 0000 0000 0000 0000 0000 0000 0000 0000  ................
0000210: 0b00 0200 0000 0183 3174 0020 0000 2bc4  ........1t. ..+.
0000220: 0500 5344 5f4b 5f43 2e46 4c43 0000 0000  ..SD_K_C.FLC....
0000230: 0000 0000 0000 0000 0000 0000 0000 0000  ................
0000240: 0000 0004 0002 0000 0001 8317 cc3e 0000  .............>..
0000250: 002b e405 0046 495f 4b5f 432e 464c 4300  .+...FI_K_C.FLC.
0000260: 0000 0000 0000 0000 0000 0000 0000 0000  ................
0000270: 0000 0000 0000 0500 0200 0000 0183 7345  ..............sE
0000280: 4c00 0000 69e4 0500 544f 435f 4b5f 432e  L...i...TOC_K_C.
0000290: 464c 4300 0000 0000 0000 0000 0000 0000  FLC.............
00002a0: 0000 0000 0000 0000 0007 0002 0000 0001  ................
00002b0: 833c 50f6 0500 00b5 e405 0049 4f5f 4b5f  .<P........IO_K_
00002c0: 432e 464c 4300 0000 0000 0000 0000 0000  C.FLC...........
00002d0: 0000 0000 0000 0000 0000 0000 0800 0200  ................
00002e0: 0000 0183 c5f9 ec04 0000 abea 0500 4953  ..............IS
00002f0: 5f4b 5f43 2e46 4c43 0000 0000 0000 0000  _K_C.FLC........
0000300: 0000 0000 0000 0000 0000 0000 0000 000e  ................
0000310: 0002 0000 0001 833a 8400 0800 0097 ef05  .......:........
0000320: 004f 454d 5f4b 5f43 2e46 4c43 0000 0000  .OEM_K_C.FLC....
0000330: 0000 0000 0000 0000 0000 0000 0000 0000  ................

It seems that this is flash is as usual made up of different files. I am interested in the OEM_DEF.FLC. Does anyone recognize this format? What could .FLC be? How can we extract this?

Cheers,
Arnuschky
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