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Messages - rweber

General / Question about backdoor.doc by eric
March 08, 2006, 02:26:08 AM
Dear Sirs,

i've got a question about erics description installing a bootvector backdoor. He writes:

     jb  P3.1,xxxyyy ;TxD always high without cliplead
     mov  AUXR1,#020h  ;enable boot
!!insert parametres for set boot vector as in AN 461 pg 14
     call 0fff0h
!! insert parametres for set status byte as in AN 461 pg 14
     call 0fff0h
     jmp  $            ;wait for reset

I understand the comments about adding code for setting the boot vector and status byte.

But first, I think, the boot vector and status byte must be erased before they can be reprogrammed?