Hi, I've been working on an x86 platform and want to use DT. However I've hit a snag when trying to instantiate the I/O APIC. I've been trying to follow what the CE4100 does and most things seem to work fine but when I add the DT node for the I/O APIC things start to fail. I've been able to trace the issue to x86_add_irq_domains(), which in turn calls ioapic_add_ofnode() from which irq_domain_add_legacy() is called.
The platform that I use hits the WARN_ON(!irq_data || irq_data->domain). Looking further this seems to be caused by all irq_get_irq_data(irq) returning NULL for irq >= 16. That in turn I think is due to init_ISA_irqs() setting up only the first NR_IRQS_LEGACY interrupts. However the call to irq_domain_add_legacy() wants 32 interrupts. This was introduced by commit b4e5185 "irq_domain/x86: Convert x86 (embedded) to use common irq_domain)". I wonder what I'm doing wrong. I don't get how this is made to work on CE4100. Later the code crashes, but I can't exactly pinpoint the location because the oops doesn't fit on the screen. I don't have a serial port that I can use instead, so is there anything else I can do to obtain a complete backtrace? Thierry
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