On Sun, 7 Sep 2003, elife elife wrote:
Hi, I am trying util/vgabios but encounter a strange problem: testbios seems fetching wrong instruction
[root@linux vgabios]# ./testbios -s 64k -t ~/lb/500video.bios.bin running file /root/lb/500video.bios.bin No base specified. defaulting to 0xc0000 No initial code segment specified. defaulting to 0xc000 No initial instruction pointer specified. defaulting to 0x0003 Switching to single step mode. AX=00ff BX=0000 CX=0000 DX=0080 SP=fff8 BP=0000 SI=0000 DI=0000 DS=0040 ES=0000 SS=0030 CS=c000 IP=0005 NV UP DI PL NZ NA PO NC c000:0003 eb53 JMP 58 c000:3 - AX=00ff BX=0000 CX=0000 DX=0080 SP=fff8 BP=0000 SI=0000 DI=0000 DS=0040 ES=0000 SS=0030 CS=c000 IP=005a NV UP DI PL NZ NA PO NC c000:0058 0000 ADD [BX+SI],AL c000:58 -
[root@linux lb]# od -x 500vi* |more 0000000 aa55 eb60 3753 3034 3030 c237 2a8a 522a 0000020 5345 5245 4556 2044 00b1 4f46 2052 4249 0000040 204d 4f43 504d 5441 4249 4c49 5449 2a59 0000060 2a2a a807 0000 1090 3130 302f 2f37 3032 0000100 3230 0000 2e31 3431 3c20 4144 203e 2020 0000120 3156 2033 2020 2020 83e9 075e 6f43 7970
testbios said c000:0058 is 0000 but in file, it's E9835E JMP 5EDE
Best Regards!
interesting, I have seen a similar sort of problem but was not sure what it was. I'll try to take a look.
ron