tree 850143902fe64e70d9335b1fe9cfbe2df4ff15bc
parent 0b3c576f1c18dde0e0e4111f7818dc47558b6023
author Simon Glass <sjg@chromium.org> 1571629070 -0600
committer Bin Meng <bmeng.cn@gmail.com> 1572736828 +0800

x86: tpl: Add a fake PCI bus

In TPL we try to minimise code size so do not include the PCI subsystem.
We can use fixed BARs and drivers can directly program the devices that
they need.

However we do need to bind the devices on the PCI bus and without PCI this
does not ordinarily happen. As a work-around, define a fake PCI bus which
does this binding, but no other PCI operations. This is a convenient way
to ensure that we can use the same device tree for TPL, SPL and U-Boot
proper:

   TPL    - CONFIG_TPL_PCI is not set (no auto-config, fake PCI bus)
   SPL    - CONFIG_SPL_PCI is set (no auto-config but with real PCI bus)
   U-Boot - CONFIG_PCI is set (full auto-config after relocation)

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>