Problem interpreting pSOS Flash Filesystem

[sub205]

Hello,

i'm currently trying to fix a management card for a laser interconnect (1GBit WAN).
The board is based on a i960, designed roughly around 2000 using a 28F160S5 (64k block, 2MiB)-Flash and running pSOS.
Unfortunately, the manufacturer is no longer available and got sold. The new owner does not have any technical stuff.

There are different variants of the management-card, i got a PoF-module (i think from a switch) and a dump from the flashrom of a correct one.
The Bootrom is running, i can get into pROBE+ (loader/debugger) and upload stuff via Z-Modem.
It beggs for some kind of Bootfile/Image, maybe the stage2.cof i'm trying to extract from the Flashdump.

The Flash itself has 64k blocks with the last 10 byte looking like the organisation-information (wear leveling, bad block management etc)
There 64k-block itself seems to be divided in 63x1k with some kind of 6-byte-per-entry "sector-list", containing 0x3f in every entry.

Does someone know how to interpret and extract files from this filesystem or maybe has the pSOS developer tools ready?
The Filesystem itself has a file called "filelist" which should be the "directory-index" according to some documents on the net.

The footer of every 64k-Block looks this way:

Code: [Select]

0000fff0  b8 0f ff ff ff ff 03 00  00 00 01 00 fe ff ff c3  |¸.ÿÿÿÿ......þÿÿÃ|
0001fff0  f4 0f ff ff ff ff 03 00  00 00 09 00 f6 ff ff c3  |ô.ÿÿÿÿ......öÿÿÃ|
0002fff0  56 0c ff ff ff ff 02 00  00 00 02 00 fd ff ff c3  |V.ÿÿÿÿ......ýÿÿÃ|
0003fff0  2f 0c ff ff ff ff 02 00  00 00 04 00 fb ff ff c3  |/.ÿÿÿÿ......ûÿÿÃ|
0004fff0  fd 08 ff ff ff ff 03 00  00 00 06 00 f9 ff ff c3  |ý.ÿÿÿÿ......ùÿÿÃ|
0005fff0  20 00 00 00 00 00 02 00  00 00 00 00 ff ff fe c3  | ...........ÿÿþÃ|
0006fff0  ff ff ff ff ff ff 03 00  00 00 13 00 ec ff ff c3  |ÿÿÿÿÿÿ......ìÿÿÃ|
0007fff0  ff ff ff ff ff ff 03 00  00 00 ff ff ff ff ff f3  |ÿÿÿÿÿÿ....ÿÿÿÿÿó|
0008fff0  eb 0f ff ff ff ff 02 00  00 00 08 00 f7 ff ff c3  |ë.ÿÿÿÿ......÷ÿÿÃ|
0009fff0  86 0d ff ff ff ff 05 00  00 00 03 00 fc ff ff c3  |..ÿÿÿÿ......üÿÿÃ|
000afff0  ff ff ff ff ff ff 02 00  00 00 0a 00 f5 ff ff c3  |ÿÿÿÿÿÿ......õÿÿÃ|
000bfff0  ff ff ff ff ff ff 04 00  00 00 0c 00 f3 ff ff c3  |ÿÿÿÿÿÿ......óÿÿÃ|
000cfff0  ff ff ff ff ff ff 04 00  00 00 12 00 ed ff ff c3  |ÿÿÿÿÿÿ......íÿÿÃ|
000dfff0  ff ff ff ff ff ff 04 00  00 00 14 00 eb ff ff c3  |ÿÿÿÿÿÿ......ëÿÿÃ|
000efff0  ff ff ff ff ff ff 02 00  00 00 0e 00 f1 ff ff c3  |ÿÿÿÿÿÿ......ñÿÿÃ|
000ffff0  ff ff ff ff ff ff 02 00  00 00 10 00 ef ff ff c3  |ÿÿÿÿÿÿ......ïÿÿÃ|
0010fff0  ff ff ff ff ff ff 02 00  00 00 0d 00 f2 ff ff c3  |ÿÿÿÿÿÿ......òÿÿÃ|
0011fff0  ff ff ff ff ff ff 03 00  00 00 0f 00 f0 ff ff c3  |ÿÿÿÿÿÿ......ðÿÿÃ|
0012fff0  3f 10 ff ff ff ff 02 00  00 00 07 00 f8 ff ff c3  |?.ÿÿÿÿ......øÿÿÃ|
0013fff0  ff ff ff ff ff ff 02 00  00 00 0b 00 f4 ff ff c3  |ÿÿÿÿÿÿ......ôÿÿÃ|
0014fff0  ff ff ff ff ff ff 02 00  00 00 11 00 ee ff ff c3  |ÿÿÿÿÿÿ......îÿÿÃ|
0015fff0  30 0d ff ff ff ff 02 00  00 00 05 00 fa ff ff c3  |0.ÿÿÿÿ......úÿÿÃ|
0016fff0  ff ff ff ff ff ff 01 00  00 00 15 00 ea ff ff c3  |ÿÿÿÿÿÿ......êÿÿÃ|
0017fff0  ff ff ff ff ff ff 01 00  00 00 16 00 e9 ff ff c3  |ÿÿÿÿÿÿ......éÿÿÃ|
0018fff0  ff ff ff ff ff ff 01 00  00 00 17 00 e8 ff ff c3  |ÿÿÿÿÿÿ......èÿÿÃ|
0019fff0  ff ff ff ff ff ff 01 00  00 00 18 00 e7 ff ff c3  |ÿÿÿÿÿÿ......çÿÿÃ|
001afff0  ff ff ff ff ff ff 01 00  00 00 19 00 e6 ff ff c3  |ÿÿÿÿÿÿ......æÿÿÃ|
001bfff0  ff ff ff ff ff ff 01 00  00 00 1a 00 e5 ff ff c3  |ÿÿÿÿÿÿ......åÿÿÃ|
001cfff0  ff ff ff ff ff ff 01 00  00 00 1b 00 e4 ff ff c3  |ÿÿÿÿÿÿ......äÿÿÃ|
001dfff0  ff ff ff ff ff ff 01 00  00 00 1c 00 e3 ff ff c3  |ÿÿÿÿÿÿ......ãÿÿÃ|
001efff0  ff ff ff ff ff ff 01 00  00 00 1d 00 e2 ff ff c3  |ÿÿÿÿÿÿ......âÿÿÃ|
001ffff0  ff ff ff ff ff ff 01 00  00 00 1e 00 e1 ff ff c3  |ÿÿÿÿÿÿ......áÿÿÃ|

Here is one example sector-footer:

Code: [Select]

0000fee0  ff ff ff ff ff ff ff ff  ff ff bf b3 f6 00 19 00  |ÿÿÿÿÿÿÿÿÿÿ¿³ö...|
0000fef0  3f 9a f6 00 19 00 3f 81  f6 00 19 00 3f 68 f6 00  |?.ö...?.ö...?hö.|
0000ff00  19 00 3f 4f f6 00 19 00  3f 36 f6 00 19 00 3f 1d  |..?Oö...?6ö...?.|
0000ff10  f6 00 19 00 3f 04 f6 00  19 00 3f eb f5 00 19 00  |ö...?.ö...?ëõ...|
0000ff20  1f d2 f5 00 19 00 3f b9  f5 00 19 00 1f a8 f5 00  |.Òõ...?¹õ....šõ.|
0000ff30  11 00 3f 8f f5 00 19 00  1f 7e f5 00 11 00 3f 48  |..?.õ....~õ...?H|
0000ff40  f5 00 36 00 3f 12 f5 00  36 00 3f f9 f4 00 19 00  |õ.6.?.õ.6.?ùô...|
0000ff50  3f e0 f4 00 19 00 3f c7  f4 00 19 00 3f ae f4 00  |?àô...?Çô...?®ô.|
0000ff60  19 00 3f 95 f4 00 19 00  3f 7c f4 00 19 00 3f 63  |..?.ô...?|ô...?c|
0000ff70  f4 00 19 00 3f 4a f4 00  19 00 3f 31 f4 00 19 00  |ô...?Jô...?1ô...|
0000ff80  3f 88 e8 00 a9 0b 3f ef  dd 00 99 0a 3f fe d3 00  |?.è.©.?ïÝ...?þÓ.|
0000ff90  f1 09 3f 62 cf 00 9c 04  3f d8 c8 00 8a 06 3f 4c  |ñ.?bÏ...?ØÈ...?L|
0000ffa0  be 00 8c 0a 3f ed ae 00  5f 0f 3f 3f a0 00 ae 0e  |Ÿ...?í®._.?? .®.|
0000ffb0  3f d1 94 00 6e 0b 3f 9c  85 00 35 0f 3f cc 76 00  |?Ñ..n.?...5.?Ìv.|
0000ffc0  d0 0e 3f 0f 69 00 bd 0d  3f 43 59 00 cc 0f 3f fb  |Ð.?.i.œ.?CY.Ì.?û|
0000ffd0  47 00 48 11 3f f7 38 00  04 0f 3f f5 2a 00 02 0e  |G.H.?÷8...?õ*...|
0000ffe0  3f 94 1e 00 61 0c 3f b8  0f 00 dc 0e 3f 00 00 00  |?...a.?ž..Ü.?...|
0000fff0  b8 0f ff ff ff ff 03 00  00 00 01 00 fe ff ff c3  |ž.ÿÿÿÿ......þÿÿÃ|

I would be very happy if anyone can help me. Have put many hours into this but did not solve the puzzle. 

Kind regards,
Stephan