Re: AA55 signature at the end of Linux bootsector

Richard B. Johnson (root@chaos.analogic.com)
Wed, 8 Jul 1998 09:08:04 -0400 (EDT)


On Wed, 8 Jul 1998, Tigran Aivazian wrote:

> Hello guys,
>
> Just a suggestion: would it not be nice to have a 0xAA55 signature at the
> end of the bootsector (NOT an MBR!) of the Linux root partition so that
> commercial bootloaders (e.g. the one that comes with UnixWare 7) could
> load it just as easily as they load dos/windows stuff instead of giving
> "Missing operating system" error?
>
> Btw, just to confirm, am I right in assuming that LILO does put AA55
> signature at the end of bootsector if installed in a partition instead of
> an MBR?

It puts it on mine.

Script started on Wed Jul 8 09:03:50 1998
# od -x /dev/sda | more
0000000 69eb 494c 4f4c 0001 0014 ffff 001b 0000
0000020 00bf b906 0309 5b82 0a01 8203 015b 0308
0000040 5b82 0001 0000 0000 0000 0c00 8203 015b
0000060 032f 0b82 3001 8203 010b 0331 0b82 3201
0000100 8203 010b 0333 0b82 3401 8203 010b 0335
0000120 0b82 3601 8203 010b 0000 0000 0000 0000
0000140 0000 0000 0000 0000 0000 b800 07c0 d88e
0000160 068c 0066 3689 0064 1e89 0068 1688 006a
0000200 00b8 8e9a b9c0 0100 f629 ff29 f3fc eaa5
0000220 0094 9a00 8efa 8ed8 bcc0 b000 00b8 8e90
0000240 fbd0 0db0 57e8 b000 e80a 0052 4cb0 4de8
0000260 be00 0030 00bb fc10 89ad adc1 c289 c809
0000300 2074 e846 0043 0672 c381 0200 eaeb b050
0000320 e820 002a 8858 e8e0 0012 c031 c288 13cd
0000340 cfeb 49b0 17e8 ea00 0000 9b00 c050 04e8
0000360 01e8 5800 0f24 3004 3a3c 0272 0704 ff30
0000400 0eb4 10cd 5ac3 5b59 f6c3 40c2 5274 e280
0000420 53bf 5251 08b4 13cd eb72 f388 885a 6d16
0000440 8801 30f2 88f6 58f7 8651 d0cd d0c5 80c5
0000460 03e5 0e89 016b 8359 3fe1 f1f7 c2fe 1688
0000500 016e d231 f743 88f3 8ad6 6d16 3b01 6b06
0000520 7701 8613 d0c4 d0c8 0ac8 6e06 8901 5bc1
0000540 01b8 cd02 c313 315b f9c0 00c3 0000 0000
--More--
0000560 0000 0000 0000 0000 0000 0000 0000 0000
0000660 0000 0000 0000 0000 0000 0000 0000 0180
0000700 0001 7f06 ff60 0020 0000 ffe0 001f 0000
0000720 0081 7f05 fee0 0000 0020 f000 001f 0000
0000740 0000 0000 0000 0000 0000 0000 0000 0000
0000760 0000 0000 0000 0000 0000 0000 0000 aa55
^^^^____ Right here
0001000 0000 0000 0000 0000 0000 0000 0000 0000
*
# exit
exit

Script done on Wed Jul 8 09:04:18 1998

Cheers,
Dick Johnson
***** FILE SYSTEM MODIFIED *****
Penguin : Linux version 2.1.108 on an i586 machine (66.15 BogoMips).
Warning : It's hard to remain at the trailing edge of technology.

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