[coreboot] how to route IRQ4 (COM1) on LPC bus for bayleybay_fsp

benoit benoit.sansoni at gmail.com
Fri Jan 15 20:42:06 CET 2016


I mean by not available : not working under my real time OS that I load
through a grub2 paylaod.

You are right.
I replace the IRQ 4 by an other one that it is not used in my system as
follow :

        PIRQ_PIC(A,  5), \
        PIRQ_PIC(B,  6), \
        PIRQ_PIC(C,  7), \
        PIRQ_PIC(D, 10), \
        PIRQ_PIC(E, 11), \
        PIRQ_PIC(F, 12), \
        PIRQ_PIC(G, 14), \
        PIRQ_PIC(H, 15)

And it works. Perfectly.
I have my serial console on COM1 under the OS.
I did not chose IRQ 3 because I am using also the COM2.

Many thanks

On 14/01/2016 23:02, Rudolf Marek wrote:
> Hi
> What does it mean not available? Maybe you can check if you programmed ELCR
> register to edge for IRQ4.
> You can't share the IRQ4 with PCI IRQ I think thats why it does not work.
> You need to route the the PIRQA to something else, like IRQ3.
> Thanks
> Rudolf
> .

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