Linux as BL33 - TF-A

21 Nov 2021


      Hi.
I'm trying to run on our new platform Linux as BL33, preloaded to DDR.
currently simulated over QEMU.
I think that BL31 started BL33 in EL0, which cause problems:
QEMU outputs this message: (complete log below)
Exception return from AArch64 EL3 to AArch64 EL0 PC 0x800080000
What could I have done wrong in the configuration that caused it ?
What should I check ?
Thanks !
Ramon.
NOTICE:  Booting Trusted Firmware
NOTICE:  BL1: v2.5(debug):v2.5-61-g84d7d6a30-dirty
NOTICE:  BL1: Built : 14:53:02, Nov 21 2021
INFO:    BL1: RAM 0x15500000 - 0x15513000
WARNING: BL1: neoverse_n1: CPU workaround for 1946160 was missing!
INFO:    BL1: Loading BL2
INFO:    Using mmap
INFO:    Using FIP
INFO:    Loading image id=1 at address 0x14300000
INFO:    Image id=1 loaded: 0x14300000 - 0x143052d1
INFO:    bl1_mem_layout->total_base = 0x14000000x
NOTICE:  BL1: Booting BL2
INFO:    Entry point address = 0x14300000
INFO:    SPSR = 0x3c5
Exception return from AArch64 EL3 to AArch64 EL1 PC 0x14300000
INFO:    BL1 inherited memory layout: 0x14000000 [size = 22020096]
NOTICE:  BL2: v2.5(debug):v2.5-61-g84d7d6a30-dirty
NOTICE:  BL2: Built : 14:53:02, Nov 21 2021
INFO:    BL2: Skip loading image id 23
INFO:    BL2: Doing platform setup
INFO:    BL2: Loading image id 3
INFO:    Using mmap
INFO:    Using FIP
INFO:    Loading image id=3 at address 0x800000000
INFO:    Image id=3 loaded: 0x800000000 - 0x8000080a9
INFO:    BL2: Skip loading image id 5
Taking exception 13 [Secure Monitor Call]
...from EL1 to EL3
...with ESR 0x17/0x5e000000
...with ELR 0x14302a04
...to EL3 PC 0x5400 PSTATE 0x3cd
NOTICE:  BL1: Booting BL31
INFO:    Entry point address = 0x800000000
INFO:    SPSR = 0x3cd
Exception return from AArch64 EL3 to AArch64 EL3 PC 0x800000000
INFO:    Boot BL33 from 0x800080000 for 0 Bytes
NOTICE:  BL31: v2.5(debug):v2.5-61-g84d7d6a30-dirty
NOTICE:  BL31: Built : 14:53:04, Nov 21 2021
INFO:    GICv3 without legacy support detected.
INFO:    ARM GICv3 driver initialized in EL3
INFO:    Maximum SPI INTID supported: 63
INFO:    BL31: Initializing runtime services
WARNING: BL31: neoverse_n1: CPU workaround for 1946160 was missing!
INFO:    BL31: Preparing for EL3 exit to normal world
INFO:    Entry point address = 0x800080000
INFO:    SPSR = 0x0
Exception return from AArch64 EL3 to AArch64 EL0 PC 0x800080000
Taking exception 1 [Undefined Instruction]
...from EL0 to EL1
...with ESR 0x18/0x6232c061
...with ELR 0x8000b7164
...to EL1 PC 0x400 PSTATE 0x3c5
Taking exception 4 [Data Abort]