On Thu, Dec 31, 2020 at 07:08:25PM -0800, Bin Gao wrote:
> On physical hardware, some PCI devices are not detectable when
> UEFI invokes our InitializeYourself() function. But they
> are guaranteed to be available before UEFI invokes our
> PreparToBoot() function.
>
> Signed-off-by: Bin Gao <gao...@amazon.com>
> ---
> src/fw/csm.c | 11 ++++++++++-
> 1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/src/fw/csm.c b/src/fw/csm.c
> index f64bc73..1bd821e 100644
> --- a/src/fw/csm.c
> +++ b/src/fw/csm.c
> @@ -64,7 +64,9 @@ static void
> csm_maininit(struct bregs *regs)
> {
> interface_init();
> - pci_probe_devices();
> +
> + if (CONFIG_CSM && CONFIG_QEMU_HARDWARE)
> + pci_probe_devices();
>
> csm_compat_table.PnPInstallationCheckSegment = SEG_BIOS;
> csm_compat_table.PnPInstallationCheckOffset = get_pnp_offset();
> @@ -144,6 +146,13 @@ handle_csm_0002(struct bregs *regs)
> return;
> }
>
> + // On physical hardware, some PCI devices are not detectable when
> + // UEFI invokes our InitializeYourself() function. But they
> + // are guaranteed to be available before UEFI invokes our
> + // PreparToBoot() function.
> + if (CONFIG_CSM && !CONFIG_QEMU_HARDWARE)
> + pci_probe_devices();
This looks like a hack. I'm not sure what's being attempted, but a
more scalable solution will be needed.
-Kevin
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