EFI dies with Synchronous Exception at 0x0000000000000000 ... ConSplitter.dll

[dch]

From a more recent git commit, boot dies very early on. Why?

I have seen errors also at this early stage, when trying to boot OpenBSD 7.0 from the bsd.rd installer, and also when iPXE http booting loader.efi which does work ok on amd64 and IIRC on emag arm64.

Loading kernel...
/boot/kernel/kernel text=0x2a8 text=0x841b40 text=0x23aec4 data=0x1b5028 data=0x0+0x40d000 syms=[0x8+0x12bb08+0x8+0x153643]
Loading configured modules...
/boot/kernel/cryptodev.ko text=0x1f2e text=0x2850 data=0x660+0x10 syms=[0x8+0xea0+0x8+0xae9]
/mfsroot size=0x5c98000
/boot/kernel/mlx5.ko text=0xd690 text=0x23e90 data=0x1d28+0x98 syms=[0x8+0x5328+0x8+0x3e62]
loading required module 'mlxfw'
/boot/kernel/mlxfw.ko text=0xed2 text=0x154c data=0x258 syms=[0x8+0x750+0x8+0x409]
loading required module 'xz'
/boot/kernel/xz.ko text=0x850 text=0x22f0 data=0x2b8+0x400 syms=[0x8+0x870+0x8+0x412]
loading required module 'linuxkpi'
/boot/kernel/linuxkpi.ko text=0x8c0d text=0x17bf0 data=0x1f60+0x8c0 syms=[0x8+0x6e88+0x8+0x4da2]
loading required module 'backlight'
/boot/kernel/backlight.ko text=0xb76 text=0x5a8 data=0x3b8+0x28 syms=[0x8+0x7e0+0x8+0x45f]
/boot/kernel/opensolaris.ko text=0x12c3 text=0xa2c data=0x4b8+0x6830 syms=[0x8+0x1050+0x8+0x8bb]
/boot/kernel/tmpfs.ko text=0x4f5e text=0x9bc0 data=0x13e0+0xb0 syms=[0x8+0x22e0+0x8+0x1706]
/boot/kernel/zfs.ko text=0xe3380 text=0x23d9e0 data=0x275c0+0xba688 syms=[0x8+0x31f80+0x8+0x2c283]
can't find '/boot/entropy'
/boot/kernel/mlx5en.ko text=0x12143 text=0x146ec data=0x2ca8+0x8 syms=[0x8+0x3798+0x8+0x25a3]
can't find '/etc/hostid'
/boot/kernel/iscsi.ko text=0x5933 text=0x8fdc data=0x14d8+0x2c syms=[0x8+0x21f0+0x8+0x1afc]
No valid device tree blob found!
WARNING! Trying to fire up the kernel, but no device tree blob found!
EFI framebuffer information:
addr, size     0x10000000, 0x300000
dimensions     1024 x 768
stride         1024
masks          0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000

BOOT_TIME_EVENT: { "Phase" : "BDS", "Step" : "End", "msg" : "End of BDS phase" }


Synchronous Exception at 0x0000000000000000
PC 0x000000000000
PC 0x083FABBAE41C (0x083FABBA7000+0x0000741C) [ 1] ConSplitter.dll
PC 0x083FABBAE1F0 (0x083FABBA7000+0x000071F0) [ 1] ConSplitter.dll
PC 0x083FA6E50740
PC 0x083FA6E4FA08
PC 0x083FA6E18E40
PC 0x083FA6E62358
PC 0x083FA6E623DC
PC 0x083FA6E0E02C
PC 0x083FA6E0DDD0
PC 0x083FA6E0DC04
PC 0x083FA6E0D8B0
PC 0x083FA6E16938
PC 0x083FA6E17B04
PC 0x083FA6E4D190
PC 0x083FA6E29820
PC 0x083FA6E435BC
PC 0x083FA6E29A38
PC 0x083FA6E28B08
PC 0x083FA6E2A090
PC 0x083FA6E25F34
PC 0x083FA6E22B88
PC 0x083FA6E1904C
PC 0x083FA6E10888
PC 0x083FA6E0E668
PC 0x083FA6E17430
PC 0x083FA73E79F0 (0x083FA73C4000+0x000239F0) [ 2] snp.efi
PC 0x083FA73EACB4 (0x083FA73C4000+0x00026CB4) [ 2] snp.efi
PC 0x083FA73D5414 (0x083FA73C4000+0x00011414) [ 2] snp.efi
PC 0x083FA73D5414 (0x083FA73C4000+0x00011414) [ 2] snp.efi
PC 0x083FA93BCD84 (0x083FA93A7000+0x00015D84) [ 3] AMITSE.dll
PC 0x083FA93B9954 (0x083FA93A7000+0x00012954) [ 3] AMITSE.dll
PC 0x083FA93AE154 (0x083FA93A7000+0x00007154) [ 3] AMITSE.dll
PC 0x083FAC946480 (0x083FAC943000+0x00003480) [ 4] Bds.dll
PC 0x083FAC9467E8 (0x083FAC943000+0x000037E8) [ 4] Bds.dll
PC 0x087FFFDE4100 (0x087FFFDE3000+0x00001100) [ 5] DxeCore.dll
PC 0x087FFFDE38E8 (0x087FFFDE3000+0x000008E8) [ 5] DxeCore.dll
PC 0x087FFFDE3828 (0x087FFFDE3000+0x00000828) [ 5] DxeCore.dll
[ 1] /export/home/east/bios/Release/77013100/Build/A1_2c/RELEASE_GCC/AARCH64/AmiModulePkg/Console/ConSplitter/ConSplitter/DEBUG/ConSplitter.dll
[ 2] snp.efi
[ 3] /export/home/east/bios/Release/77013100/Build/A1_2c/RELEASE_GCC/AARCH64/Build/AMITSE/DEBUG/AMITSE.dll
[ 4] /export/home/east/bios/Release/77013100/Build/A1_2c/RELEASE_GCC/AARCH64/AmiModulePkg/Bds/Bds/DEBUG/Bds.dll
[ 5] /export/home/east/bios/Release/77013100/Build/A1_2c/RELEASE_GCC/AARCH64/MdeModulePkg/Core/Dxe/DxeMain/DEBUG/DxeCore.dll

  X0 0x0000083FA6F32C60   X1 0x0000000000000014   X2 0x0000000000000000   X3 0x0000000000000000
  X4 0x0000083FB7980000   X5 0x0000000000000000   X6 0x0000083FB8030078   X7 0x0000000000000000
  X8 0x0000083FABBAE128   X9 0x0000083FA6F34000  X10 0xFEFEFEFEFEFEFEFF  X11 0x0000083FA6F0F020
 X12 0x0000000000000000  X13 0x0000083FA5179980  X14 0x0000083FA516CA70  X15 0x0000000000008120
 X16 0x0000000000000000  X17 0x0000000000003350  X18 0x0000000000000000  X19 0x0000083FA6F1D8D8
 X20 0x0000000000000005  X21 0x0000083FA6F1D8E0  X22 0x0000083FA6F24208  X23 0x0000083FA6F24240
 X24 0x0000000000000001  X25 0x0000000000000002  X26 0x0000000000000003  X27 0x0000083FA6E0DD6C
 X28 0x0000000000000008   FP 0x0000083FA6F32BF0   LR 0x0000083FABBAE41C  

  V0 0x0000000000000000 0000000000000000   V1 0x0000000000000050 0000000000000018
  V2 0x0000000000000000 40C845C8A0CE5129   V3 0x0000000000000000 40F5180000000000
  V4 0x0000000000000000 412E848000000000   V5 0x0000000000000000 3F90000000000000
  V6 0x0000000000000000 3FE0000000000000   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 0x0000000000000000 0000000000000000  V17 0x0000000000000000 0000000000000000
 V18 0x0000000000000000 0000000000000000  V19 0x0000000000000000 0000000000000000
 V20 0x0000000000000000 0000000000000000  V21 0x0000000000000000 0000000000000000
 V22 0x0000000000000000 0000000000000000  V23 0x0000000000000000 0000000000000000
 V24 0x0000000000000000 0000000000000000  V25 0x0000000000000000 0000000000000000
 V26 0x0000000000000000 0000000000000000  V27 0x0000000000000000 0000000000000000
 V28 0x0000000000000000 0000000000000000  V29 0x0000000000000000 0000000000000000
 V30 0x0000000000000000 0000000000000000  V31 0x0000000000000000 0000000000000000

  SP 0x0000083FA6F32BF0  ELR 0x0000000000000000  SPSR 0x200003C9  FPSR 0x00000010
 ESR 0x86000006          FAR 0x0000000000000000

 ESR : EC 0x21  IL 0x1  ISS 0x00000006

Instruction abort: Translation fault, second level

Stack dump:
  0083FA6F32AF0: 0000000000000000 0000083FA6F0FB4B 000000000000000A 000000000000000A
  0083FA6F32B10: 0000083FA6F1D8E0 000000000000000A 0000083FA6F32C00 0000083FA6E63448
  0083FA6F32B30: 0000083FA6F14C5E 0000000000000000 0000083FA6F0FB4B 0000000000000000
  0083FA6F32B50: 0000000000000000 0000083FA6F0FB4B 000000000000002D 0000083FA6E6346C
  0083FA6F32B70: 0000083FA6F32CB8 0000083FA6F0FB79 0000083FA6F32CA8 0000083FA6F10296
  0083FA6F32B90: 0000083FA6F32CB8 0000083FA6E63448 0000083FA6F32CA0 0000000000000000
  0083FA6F32BB0: 0000000000000000 0000000000000000 0000000000000000 0000083FA6F0CA46
  0083FA6F32BD0: 000000000000004C 0000083FA6E6346C 0000083FA6F32CE8 0000083FA6F0CA93
> 0083FA6F32BF0: 0000083FA6F32C40 0000083FABBAE1F0 0000083FA6F32C60 0000083FABBB2F08
  0083FA6F32C10: 0000000000000008 0000083FA6E0DD6C 0000000000000003 0000000000000002
  0083FA6F32C30: 0000083FABC4D918 8000000000000006 0000083FA6F32C90 0000083FA6E50740
  0083FA6F32C50: 0000083FA6F32C80 0000083FABBB2F08 0000083FA2E0E000 0000083FA6F0F023
  0083FA6F32C70: 0000000000000000 8000000000000002 0000083FB7980000 0000000000000000
  0083FA6F32C90: 0000083FA6F32CB0 0000083FA6E4FA08 0000083FA6F32CF0 0000083FA6F34EB8
  0083FA6F32CB0: 0000083FA6F32CC0 0000083FA6E18E40 0000083FA6F32CF0 0000083FA6E62358
  0083FA6F32CD0: 0000083FA6F24200 00000000FFFFFFC8 0000083FA2E0E000 0000083FA6F0CA46