Bay Trail -I SoC which has 30679 D0 Stepping Processor
Microcode Versions tried
M0F30679_90A
M0130679_903
MSR 79 – writes microcode to SoC (Passed)
MSR 8b – Reads microcode revision (Passed)
Hang at below code
; For A-step, bits 0 and 1 need to be set after patch load and before MRC (first possible reset)
;Without setting BIOS_RESET_DONE on A0, Bios will stuck at vlvdxe after GT PowerManagement
; Could be done later in flow for B-step, but no need to move and have it in 2 places.
;
;Program BIOS_RESET_DONE (bit0) and BIOS_ALL_DONE (bit1) in PUNIT.BIOS_RESET_CPL, Port 0x4, Offset 0x5
;BIOS_ALL_DONE is newly added bit for B0.
mov edx, 0CF8h ;config MCD
mov eax, 800000d4h
out dx, eax
;
mov edx, 0CFCh ;set Bit0 and Bit1
mov eax, 3
out dx, eax
mov edx, 0CF8h ;config MCR
mov eax, 800000d0h
out dx, eax
mov edx, 0CFCh ;write_opcode+portID+offset
mov eax, 007040510h
out dx, eax
why there is a Hang at this register write? when i remove this code , boot goes ahead and hangs at GT Power Management.when i disable both, Graphics does not come up
