Some HW / drivers like PCIe use imprecise aborts on ARM to detect ports that are behind a switch, by using: hook_fault_code(16+6, ...);
At PCIe bus enumeration, imprecise aborts are not enabled. Imprecise aborts are enabled late during bootup process, when userland init starts. It seems unmasked later when starting userland init process (e.g. when CPSR.A bit on arm is cleared). Aborts are deferred until then. Enable imprecise external aborts earlier during bootup. Reference : http://marc.info/?l=linux-arm-kernel&m=139118404708291&w=2 Fabrice Gasnier (1): ARM: Add imprecise abort enable/disable macro arch/arm/include/asm/irqflags.h | 33 +++++++++++++++++++++++++++++++++ arch/arm/kernel/smp.c | 1 + arch/arm/kernel/traps.c | 4 ++++ 3 files changed, 38 insertions(+) -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
