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Thanks for Jernej's JTAG debugging effort, it turns out that the BROM expects SP_IRQ to be saved and restored, when we want to enter back into FEL after the SPL's AArch64 stint. Save and restore SP_IRQ as part of the FEL state handling. The banked MRS/MSR access to SP_IRQ, without actually being in IRQ mode, was introduced with the ARMv7 virtualisation extensions. The Arm Cortex-A8 cores used in the A10/A13s or older F1C100s SoCs would not support that, but this code here is purely in the ARMv8/AArch64 code path, so it's safe to use unconditionally. Reported-by: Jernej Skrabec <jernej.skrabec@gmail.com> Signed-off-by: Andre Przywara <andre.przywara@arm.com> Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>