AMD KB reset 發兩次 (AMI)

SBSECInit.asm

IF MKF_SB900_RESET_WORKAROUND
;; Warm reset work around ( Do cold reset) end
;SB900 CF9 Reset workaround
    cmp   BYTE PTR DS:[0Ffff0h], 0EAh ; Is it warm reset ?
    jne NotWarmReset

    mov dx,0cf9h
    mov ax,6   ;hw reset
    out dx,ax

    mov dx,80h
    out dx,al

    jmp $
NotWarmReset:


As I check the KBC reset in Godvari platform , I can see 2 reset in the wave form ,
after trace , it seems to be the workaround from old chipset ...
a warm reset will issue a cold reset  right after it ...