とりあえず、読みだしてみる。

root@bt:~/# jtag
JTAG Tools 0.6
Copyright (C) 2002, 2003 ETC s.r.o.
JTAG Tools is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
There is absolutely no warranty for JTAG Tools.

Warning: JTAG Tools may damage your hardware! Type "quit" to exit!

Type "help" for help.

jtag> cable parallel 0x378 DLC5
Initializing Xilinx DLC5 JTAG Parallel Cable III on parallel port at 0x378
jtag> detect
IR length: 8
Chain length: 1
Device Id: 0
chain.c(110) Part 0 without active instruction
chain.c(133) Part 0 without active instruction
chain.c(110) Part 0 without active instruction
jtag> include motorola/mpc8241/1.2
jtag> endian big
jtag> instruction SAMPLE/PRELOAD
jtag> shift ir
jtag> shift dr
jtag> dr
010111110000110011011111000010000000000000000000000000000000000000000000010000000000000000000000000000001111010101100000000000000000000000000000000010011000000000001000000000000000010010000011000000100011110110011101111111111110000100100000000000000000000100100000000000011111111110111111111111010111101111010001111011000101100000001001011111110010001010000000000100001010110110001000101010011101000000000000000000000000000000000000000000000100011111010111111110001110010001111101111111000000000000000000000
jtag> instruction EXTEST
jtag> shift ir
jtag> initbus mpc824x
jtag> detectflash 0xffc00000
jedec_detect: mid 0, did 0
Flash not found!
jtag> flashmem 0xfff00000 /usr/local/share/jtag/bootcode.bin
no flash driver found
jtag> readmem 0xffc00000 1000 testrom.bin
address: 0xFFC00000
length:  0x000003E8
reading:
addr: 0xFFC003E8
Done.
jtag> quit
root@bt:~/# od -xa testrom.bin
0000000 4040 4140 4040 4150 554b 4f52 426d 584f
          @   @   @   A   @   @   P   A   K   U   R   O   m   B   O   X
0000020 4968 5445 5553 414e 4069 4040 4040 4040
          h   I   E   T   S   U   N   A   i   @   @   @   @   @   @   @
0000040 4040 4040 4040 4040 4c46 5341 6048 6e71
          @   @   @   @   @   @   @   @   F   L   A   S   H   `   q   n
0000060 4071 4040 4040 4040 4040 4040 4040 4040
          q   @   @   @   @   @   @   @   @   @   @   @   @   @   @   @
0000100 4040 4040 4040 4040 4140 4240 4040 4468
          @   @   @   @   @   @   @   @   @   A   @   B   @   @   h   D
0000120 4b50 696e 6b40 7a71 604c 4169 4040 6c40
          P   K   n   i   @   k   q   z   L   `   i   A   @   @   @   l
0000140 4a40 c7fa 4a40 f3fa 6040 4776 cb5f 4848
          @   J   z   G   @   J   z   s   @   `   v   G   _   K   H   H
0000160 4950 407f 4342 6d76 696c 756e 4078 5cec
          P   I del   @   B   C   v   m   l   i   n   u   x   @   l   \
0000200 704d d753 7ed5 d24f c241 486e 63d0 6e41
          M   p   S   W   U   ~   O   R   A   B   n   H   P   c   A   n
0000220 c1d6 7664 5850 58c7 ccfa c845 e47f dfcf
          V   A   d   v   P   X   G   X   z   L   E   H del   d   O   _
0000240 dc64 fded 76c9 6b64 7b63 71c1 444d 6762
          d   \   m   }   I   v   d   k   c   {   A   q   M   D   b   g
0000260 e4cf 7e49 44f2 cec7 44d0 61fe db77 44d2
          O   d   I   ~   r   D   G   N   P   D   ~   a   w   [   R   D
0000300 edc0 5dc5 43f6 d85b 5366 5172 dfd6 61f1
          @   m   E   ]   v   C   [   X   f   S   r   Q   V   _   q   a
0000320 e5dd ec74 7b58 dad9 ccc1 f2d0 71d9 d87e
          ]   e   t   l   X   {   Y   Z   A   L   P   r   Y   q   ~   X
0000340 e1f0 fb47 e7dd 4367 644e e6e9 72cd 65e3
          p   a   G   {   ]   g   g   C   N   d   i   f   M   r   c   e
0000360 cee6 f77b f3de 7dee df7f f779 c7dc 7dde
          f   N   {   w   ^   s   n   } del   _   y   w   \   G   ^   }
0000400 e444 dbd1 7ad2 5643 d95e 6b6d cd6f d5d5
          D   d   Q   [   R   z   C   V   ^   Y   m   k   o   M   U   U
0000420 eff7 d5d1 65cb 5972 e5c6 55dc 65eb defa
          w   o   Q   U   K   e   r   Y   F   e   \   U   k   e   z   ^
0000440 6847 68cd e16f d7dd c7e8 6b4f cecf 5dd0
          G   h   M   h   o   a   ]   W   h   G   O   k   O   N   P   ]
0000460 78e1 4d79 ee44 d076 c553 4ef0 72f1 58c3
          a   x   y   M   D   n   v   P   S   E   p   N   q   r   C   X
0000500 5173 6b5c dc6e 4cea c677 5156 d3d5 fa6d
          s   Q   \   k   n   \   j   L   w   F   V   Q   U   S   m   z
0000520 506f cce9 7e45 e6c5 edd2 5fc1 c457 d9dc
          o   P   i   L   E   ~   E   f   R   m   A   _   W   D   \   Y
0000540 4b6c 6d65 e6d9 45e6 52fb ceee f46d e3f3
          l   K   e   m   Y   f   f   E   {   R   n   N   m   t   s   c
0000560 ed44 78ed eb4f d142 58ca defa efc0 7d70
          D   m   m   x   O   k   B   Q   J   X   z   ^   @   o   p   }
0000600 f541 4dc1 ee46 4347 467d 6fee 444d 7ef5
          A   u   A   M   F   n   G   C   }   F   n   o   M   D   u   ~
0000620 6077 50c0 5c4b c474 d962 cd64 606c e45b
          w   `   @   P   K   \   t   D   b   Y   d   M   l   `   [   d
0000640 ecd6 d2f8 416b 62dc d46d d95b ce42 7ec8
          V   l   x   R   k   A   \   b   m   T   [   Y   B   N   H   ~
0000660 c86a e0dc c8c2 7279 75ca 5d64 5ae4 4be7
          j   H   \   `   B   H   y   r   J   u   d   ]   d   Z   g   K
0000700 ef74 4e65 d555 7271 d7ff f2de 45df 6bf9
          t   o   e   N   U   U   q   r del   W   ^   r   _   E   y   k
0000720 e4f6 fcdb 4ec1 ec43 f569 c7db ed7d e74a
          v   d   [   |   A   N   C   l   i   u   [   G   }   m   J   g
0000740 f661 e1f7 5fe7 44d3 42d3 f5ec 607a 4ee3
          a   v   w   a   g   _   S   D   S   B   l   u   z   `   c   N
0000760 c7d9 ccf0 d4de fede 53e6 43d3 e762 78f2
          Y   G   p   L   ^   T   ^   ~   f   S   S   C   b   g   r   x
0001000 d7fd 77d0 d5d5 60ed d3ff 6e43 c76a 62ec
          }   W   P   w   U   U   m   ` del   S   C   n   j   G   l   b
0001020 47c2 e0e0 f26b 5864 594b fe56 dc4f 5379
          B   G   `   `   k   r   d   X   K   Y   V   ~   O   \   y   S
0001040 6afe dcf3 ffda ccc4 6af7 45fe f155 eed6
          ~   j   s   \   Z del   D   L   w   j   ~   E   U   q   V   n
0001060 5f5c 5fe7 c6ec efcc 4be6 53fe 56f8 cd7e
          \   _   g   _   l   F   L   o   f   K   ~   S   x   V   ~   M
0001100 7eeb fd7a dc7a d557 e9c5 df5e 6b5f dc66
          k   ~   z   }   z   \   W   U   E   i   ^   _   _   k   f   \
0001120 f64a ca4f 485b 6ffb feeb 62f6 ede0 ff60
          J   v   O   J   [   H   {   o   k   ~   v   b   `   m   ` del
0001140 edfb 7570 fe72 c1df 7ff8 d27f e7fe eddf
          {   m   p   u   r   ~   _   A   x del del   R   ~   g   _   m
0001160 ffd0 ddc1 d6df dfef f27a 49cf fcf3 60e7
          P del   A   ]   _   V   o   _   z   r   O   I   s   |   g   `
0001200 e56d d8c7 574b dfe3 c46c 65ff 74ee 7fca
          m   e   G   X   K   W   c   _   l   D del   e   n   t   J del
0001220 ed57 4b7f fff6 4c57 fc5f 7fe7 f8eb c8d7
          W   m del   K   v del   W   L   _   |   g del   k   x   W   H
0001240 575c 77f7 5fdc fffb e0ed d5df c4c9 efe7
          \   W   w   w   \   _   { del   m   `   _   U   I   D   g   o
0001260 ff65 7162 d4c4 cfe6 6e63 dc47 e354 edd9
          e del   b   q   D   T   f   O   c   n   G   \   T   c   Y   m
0001300 f0fc 6662 687a ed43 ece0 68f2 5cd9 78ee
          |   p   b   f   z   h   C   m   `   l   r   h   Y   \   n   x
0001320 58f6 f9c1 4372 66ec dfff 75df f855 7ae9
          v   X   A   y   r   C   l   f del   _   _   u   U   x   i   z
0001340 c34d cc62 4d53 dd45 fcc1 66fd f679 d16f
          M   C   b   L   S   M   E   ]   A   |   }   f   y   v   o   Q
0001360 46fa e5eb 77db 7f40 cf6e e057 fa48 7575
          z   F   k   e   [   w   @ del   n   O   W   `   H   z   u   u
0001400 f9ff f352 dfe6 68ef 56f9 daf1 d8db 76cf
        del   y   R   s   f   _   o   h   y   V   q   Z   [   X   O   v
0001420 d3c5 d17f d4e6 65d9 e165 da67 4ade 4de5
          E   S del   Q   f   T   Y   e   e   a   g   Z   ^   J   e   M
0001440 cf6b cfc1 c2f5 dfc3 f055 4d7d f2dd eecd
          k   O   A   O   u   B   C   _   U   p   }   M   ]   r   M   n
0001460 477c f369 71cd 62c5 f9cc 64d6 4a52 e645
          |   G   i   s   M   q   E   b   L   y   V   d   R   J   E   f
0001500 7cec 7ec4 c7c9 daf1 f1ca eac9 49ca d5fb
          l   |   D   ~   I   G   q   Z   J   q   I   j   J   I   {   U
0001520 69fc 72f2 c64f 62c8 c8eb fc4c 42c6 c142
          |   i   r   r   O   F   H   b   k   H   L   |   F   B   B   A
0001540 c4ca c567 5b5f df7e e1ff 7efc fe4d efee
          J   D   g   E   _   [   ~   _ del   a   |   ~   M   ~   n   o
0001560 7f65 5ecb d4dc fb5d d7da d3e6 c6f1 7ff2
          e del   K   ^   \   T   ]   {   Z   W   f   S   q   F   r del
0001600 fce4 ecf3 45ff 4df9 5f5f edfe 6fc9 ffca
          d   |   s   l del   E   y   M   _   _   ~   m   I   o   J del
0001620 c17d ebf2 7f6c 6ccb 667a 7f66 fcd9 ffff
          }   A   r   k   l del   K   l   z   f   f del   Y   | del del
0001640 67fe 7f55 7972 edfe df49 7ff8 e5c3 496f
          ~   g   U del   r   y   ~   m   I   _   x del   C   e   o   I
0001660 f95f e7e7 fe79 6d7b e5cd 43f7 effe 4eef
          _   y   g   g   y   ~   {   m   M   e   w   C   ~   o   o   N
0001700 f95f d273 fedc e5f7 fcf9 69d9 ff6e cd6d
          _   y   s   R   \   ~   w   e   y   |   Y   i   n del   m   M
0001720 dfe5 e6da 4ff2 7349 67f9 f9e7 d6fc d774
          e   _   Z   f   r   O   I   s   y   g   g   y   |   V   t   W
0001740 527f dfcb fedf 4ff2
        del   R   K   _   _   ~   r   O
0001750
root@bt:~/#

うーん、読めていそうだけど化けてるような・・・
書き込みも試してるがFlashが見つからない。やっぱり、完全にいったかなぁ。