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Fixing the Memtest EXE loader (Developers)

posted by RayeR , CZ, 11.03.2015, 19:02

Hi, I tried to compile modified memtest https://github.com/CMU-SAFARI/rowhammer
it contains your EXE loader by eric auer
https://github.com/CMU-SAFARI/rowhammer/blob/master/src/mt86%2B_loader.asm
I have a problem that produced exe throw error:

nopatch db "jmp far dword not found at setup.S offset 37h,",13,10
db "(file offset 237h is not 66h, 0eah)",13,10
db "please adjust and recompile memtestl...",13,10,"$"

I found that it is little bit shifted and when I change
mov ax,[buffer+251h] ; should be jmp far dword (ofs, seg)
cmp ax,0ea66h
to
mov ax,[buffer+251h+13] ; should be jmp far dword (ofs, seg)
it finds it and I got another error:
lgdt [...] not found at setup.S offset 0ch

so I did some further patching by adding 13 but it ended with immediate reset of PC after I run it. What is the right place to correct the offset?
fullsize matches right the size of memtest.bin

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Complete thread:

• Fixing the Memtest EXE loader - RayeR, 11.03.2015, 19:02
  • Fixing the Memtest EXE loader - roytam, 12.03.2015, 08:24
    • Fixing the Memtest EXE loader - RayeR, 12.03.2015, 17:56
      • Fixing the Memtest EXE loader - Zyzzle, 12.03.2015, 23:16
        • Fixing the Memtest EXE loader - RayeR, 13.03.2015, 01:24