...
Notes:
1: Some vipers have a large pc104 interrupt load. Occurs with both Sep 14 (a1,a8) and the Oct 4 (a6) kernels.
2: Not completely sure why on m21 the IRQ3 load is less than the pc104 load. pc104 irq routine must exit if no pending bits.
3: High USB interrupts are seen on Vipers vipers with bluetooth radios interfaced via USB. Not on Titans. Assume it is due the different interfaces.
The only titans with PC104 serial are a3 and m22. They're both OK.
The big question is what is wrong with the PC104 interrupts on a1, a5, a8 and m21. Will have to investigate those systems back in the lab.