Hi Everyone,

I'm working on a project with edk2, and these guys are trying to port edk2 to STM32MP25 platforms. I had no issue compiling and booting the image on my device. Then I've come across an issue at very early stages of booting. I was given a Synchronous Exception listed briefly below.

Synchronous Exception at 0x000000010A63501C
PC 0x00010A63501C (0x00010A633000+0x0000201C) [ 0] ArmGicDxe.dll
PC 0x00010A6350CC (0x00010A633000+0x000020CC) [ 0] ArmGicDxe.dll
PC 0x00010A63657C (0x00010A633000+0x0000357C) [ 0] ArmGicDxe.dll
PC 0x00010A85853C (0x00010A851000+0x0000753C) [ 1] DxeCore.dll
PC 0x00010A8666DC (0x00010A851000+0x000156DC) [ 1] DxeCore.dll
PC 0x00010A85BF14 (0x00010A851000+0x0000AF14) [ 1] DxeCore.dll
PC 0x000084006EBC
PC 0x00008400700C

[ 0] /local/home/phanbagi/Documents/RPi3/Build/STM32MP25/DEBUG_GCC5/AARCH64/ArmPkg/Drivers/ArmGic/ArmGicDxe/DEBUG/ArmGicDxe.dll
[ 1] /local/home/phanbagi/Documents/RPi3/Build/STM32MP25/DEBUG_GCC5/AARCH64/MdeModulePkg/Core/Dxe/DxeMain/DEBUG/DxeCore.dll

  X0 0x00000004AC100004   X1 0x0000000000000000   X2 0x0000000000000000   X3 0x4F46A76E3FDDA605
  X4 0x083D1B53F41229AD   X5 0x00000000003CF238   X6 0x0000000000000080   X7 0x0000000000000000
  X8 0x000000010A850688   X9 0x0000000400000000  X10 0x0000000109E9F000  X11 0x000000010A297FFF
 X12 0x0000000000000000  X13 0x000000000000000E  X14 0x00000000000000FF  X15 0x0000000000000002
 X16 0x000000010AFFFAD0  X17 0x0000000000395790  X18 0x0000000000000000  X19 0x00000004AC100004
 X20 0x000000010A638000  X21 0x000000010A638000  X22 0x000000010A638000  X23 0x000000010A6380A8
 X24 0x000000010A876448  X25 0x000000010A873026  X26 0x000000010A877000  X27 0x800000000000000E
 X28 0x0000000000000001   FP 0x000000010AFFFA50   LR 0x000000010A6350CC  

  V0 0xAFAFAFAFAFAFAFAF AFAFAFAFAFAFAFAF   V1 0xFFFFFF80FFFFFFD0 000000010AFFFA30
  V2 0x00000007AAAA0000 000000000E001858   V3 0x0000100000000000 0000000000000100
  V4 0x0000000000000000 0000000000000000   V5 0x0000000000000000 0000000000000000
  V6 0x0000000000000000 0000000000000000   V7 0x0000000000000000 0000000000000000
  V8 0x0000000000000000 0000000000000000   V9 0x0000000000000000 0000000000000000
 V10 0x0000000000000000 0000000000000000  V11 0x0000000000000000 0000000000000000
 V12 0x0000000000000000 0000000000000000  V13 0x0000000000000000 0000000000000000
 V14 0x0000000000000000 0000000000000000  V15 0x0000000000000000 0000000000000000
 V16 0x6145998C70863CB0 9004002B4AC68640  V17 0x646586E820A5D596 AA30249EC11F1469
 V18 0x5756252D20E5B421 336EEAEC2122B3AB  V19 0x6285C083AAECD063 020A72C37700322A
 V20 0x40846C68BA2085FB 20966526601C44BB  V21 0x818208204CD0A89D 6D84E94813E14B24
 V22 0x2362CBA9962AF073 E83ED49CD4A13F98  V23 0x0C1123CD73F5C5B0 C3E9222891467015
 V24 0x02B1194895858177 1B028BE1A860D73B  V25 0x542AB00936183D90 752F1D1CCC4D2345
 V26 0x03D02013962356F3 0CCA6F83842045EA  V27 0x9DF9D2A28D44915E 2892460B223FD84C
 V28 0x61A2CC120A809CD8 AC33034803D74C10  V29 0x7A1089709810B030 88B3298EEB68B450
 V30 0xD20F81310E0896C0 20E2BA370E2AC6F9  V31 0x6C3BBEA030B2BB50 2C2A91AAF201EF50

  SP 0x000000010AFFFA50  ELR 0x000000010A63501C  SPSR 0x400003C5  FPSR 0x00000000
 ESR 0x96000005          FAR 0x00000004AC100004

 ESR : EC 0x25  IL 0x1  ISS 0x00000005

Data abort: Translation fault, first level


By using objdump to determine where the wrong source code is, I found out that the program stopped around the code below.

UINT32
EFIAPI
MmioRead32 (
  IN      UINTN  Address
  )
{
  UINT32   Value;
  BOOLEAN  Flag;

  ASSERT ((Address & 3) == 0);

  Flag = FilterBeforeMmIoRead (FilterWidth32, Address, &Value);
  if (Flag) {
    MemoryFence ();

    if (IsTdxGuest ()) {
      Value = TdMmioRead32 (Address);
    } else {
      Value = *(volatile UINT32 *)Address;
    }

    MemoryFence ();
  }

  FilterAfterMmIoRead (FilterWidth32, Address, &Value);

  return Value;
}

Output of objdump:
UINT32
EFIAPI
MmioRead32 (
  IN      UINTN  Address
  )
{
    1fec: a9be7bfd stp x29, x30, [sp, #-32]!
    1ff0: 910003fd mov x29, sp
    1ff4: f9000bf3 str x19, [sp, #16]
    1ff8: aa0003f3 mov x19, x0
  UINT32   Value;
  BOOLEAN  Flag;

  ASSERT ((Address & 3) == 0);
    1ffc: f240041f tst x0, #0x3
    2000: 540000e0 b.eq 201c <MmioRead32+0x30>  // b.none
    2004: b0000002 adrp x2, 3000 <MmioAndThenOr32.isra.0>
    2008: b0000000 adrp x0, 3000 <MmioAndThenOr32.isra.0>
    200c: 913ac442 add x2, x2, #0xeb1
    2010: 913b1000 add x0, x0, #0xec4
    2014: d2804461 mov x1, #0x223                 // #547
    2018: 97ffff7a bl 1e00 <DebugAssert>

  Flag = FilterBeforeMmIoRead (FilterWidth32, Address, &Value);
  if (Flag) {
    Value = *(volatile UINT32 *)Address;
    201c: b9400260 ldr w0, [x19]
  }

  FilterAfterMmIoRead (FilterWidth32, Address, &Value);

  return Value;
}

--

_._,_._,_

_._,_._,_