On physical hardware especially server platforms, there are multiple root pci buses and they can exhaust all the pci bus numbers. So when scanning the pci bus, we need to allow the bus number up to 255. This only applies to CSM on physical hardware, not the case of CSM on QEMU.
Signed-off-by: Bin Gao <[email protected]> --- src/hw/pcidevice.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/src/hw/pcidevice.c b/src/hw/pcidevice.c index 8853cf7..b36183f 100644 --- a/src/hw/pcidevice.c +++ b/src/hw/pcidevice.c @@ -26,6 +26,13 @@ pci_probe_devices(void) struct hlist_node **pprev = &PCIDevices.first; int extraroots = romfile_loadint("etc/extra-pci-roots", 0); int bus = -1, lastbus = 0, rootbuses = 0, count=0; + + // On physical hardware especially server platforms, there exists + // multiple pci roots, so the pci bus number could run up to the + // top value, i.e. 0xff + if (CONFIG_CSM && !CONFIG_QEMU_HARDWARE) + extraroots = 0xff; + while (bus < 0xff && (bus < MaxPCIBus || rootbuses < extraroots)) { bus++; int bdf; -- 2.17.1 _______________________________________________ SeaBIOS mailing list -- [email protected] To unsubscribe send an email to [email protected]
