On Mon, Nov 25, 2019 at 07:25:26PM -0800, Your Real Name wrote:
> From 3bf91481863ec504d113aa6b94827bf92840e291 Mon Sep 17 00:00:00 2001
> From: gaobin <gao...@amazon.com>
> Date: Thu, 19 Sep 2019 11:23:04 -0700
> Subject: [PATCH 2/4] pci: Allow scanning pci bus number up to 255 in CSM mode
>
> On real hardware especially server platforms, there are many pci
> devices, bridges, either SoC integrated or addon. They can exhaust
> all the pci bus numbers. So when scanning the pci bus, we need to
> allow the bus number up to 255.
>
> Signed-off-by: gaobin <gao...@amazon.com>
> ---
> src/hw/pcidevice.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/src/hw/pcidevice.c b/src/hw/pcidevice.c
> index 8853cf7..acf15b4 100644
> --- a/src/hw/pcidevice.c
> +++ b/src/hw/pcidevice.c
> @@ -26,6 +26,12 @@ 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 real hardware especially server platforms, the bus number
> + // could run up to the top value, i.e. 0xff
> + if (CONFIG_CSM)
> + extraroots = 0xff;
What exactly you are trying to fix here?
seabios should find all pci devices behind bridges without problems.
cheers,
Gerd
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