On Mon, Oct 28, 2019 at 3:12 PM Bin Meng bmeng.cn@gmail.com wrote:
On Mon, Oct 21, 2019 at 11:40 AM Simon Glass sjg@chromium.org wrote:
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
Changes in v3:
- Fix 'autoallocation' typo
- Improve wording in commit message
Changes in v2: None
arch/x86/lib/tpl.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+)
Reviewed-by: Bin Meng bmeng.cn@gmail.com
applied to u-boot-x86, thanks!