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Re: Pandaboard ES
The PANDABOARD kernel relies on firmware to program the base address of
the GIC and local timers correctly in the CBAR cp15 register. Likely the
reason that the GIC driver did not discover any valid sources:
[ 1.0000000] armgic0 at armperiph0: Generic Interrupt Controller, 32 sources (0 valid)
[ 1.0000000] armgic0: 1 Priorities, 0 SPIs, 0 PPIs, 0 SGIs
With 0 valid sources, the A9 timer interrupt (and all others!) will not be
[ 1.0000000] pic_establish_intr: pic armgic irq 27 already present
This message is a bit misleading. "irq 27 already present" should really
say "irq 27 is not available".
Is this related to FDT?
No, this kernel does not use FDT. If it did, it would not use CBAR to
discover GIC and timers.
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