Messages in this thread | | | Date | Thu, 25 Aug 2022 21:36:35 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH] earlyprintk: Clean up pciserial |
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On Thu, Aug 25, 2022 at 12:39:59PM -0500, Bjorn Helgaas wrote:
> > - (((classcode >> 8) & 0xff) != 0x02)) /* 16550 I/F at BAR0 */ {
> > diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h > > index 6feade66efdb..1d2c7df8cd41 100644 > > --- a/include/linux/pci_ids.h > > +++ b/include/linux/pci_ids.h > > @@ -75,6 +75,9 @@ > > #define PCI_CLASS_COMMUNICATION_MODEM 0x0703 > > #define PCI_CLASS_COMMUNICATION_OTHER 0x0780 > > > > +/* I/F for SERIAL/MODEM */ > > I/F? Grep says it's fairly common, but doesn't seem completely > obvious. I guess it means "interface"?
It does, I carried the nomenclature from the above line; happy to change it if you want.
https://wiki.osdev.org/PCI#Class_Codes
Calls it 'Prog IF'.
> > +#define PCI_SERIAL_16550_COMPATIBLE 0x02 > > + > > #define PCI_BASE_CLASS_SYSTEM 0x08 > > #define PCI_CLASS_SYSTEM_PIC 0x0800 > > #define PCI_CLASS_SYSTEM_PIC_IOAPIC 0x080010
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