CONFIG_SYS_EARLY_PCI_INIT for PCI-attached eMMC

[Fabio Estevam]

On Thu, Aug 14, 2025 at 9:52 AM Mark Kettenis <mark.kettenis at xs4all.nl> wrote:

> Not without removing the 2nd pci_init_r() that is conditionalized on
> !CONFIG_IS_ENABLED(SYS_EARLY_PCI_INIT).
>
> That would require some thorough testing though; I certainly wouldn't
> be sure calling pci_init_r() is safe at that point on the boards I
> maintain.

You're right.

Maybe we could solve it with two patches:

1. Convert EARLY_PCI_INIT to a Kconfig symbol:

diff --git a/common/Kconfig b/common/Kconfig
index a2f653f7e722..9119a1c0869f 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -824,6 +824,13 @@ config SYS_I2C_EEPROM_NXID

 endchoice

+config EARLY_PCI_INIT
+       bool "Enumerate PCI buses early during init"
+       depends on PCI
+       help
+         Do early PCI configuration _before_ the flash gets initialised,
+         because PCU resources are crucial for flash access on some boards.
+
 config PCI_INIT_R
        bool "Enumerate PCI buses during init"
        depends on PCI

2. Select CONFIG_EARLY_PCI_INIT in the defconfig

diff --git a/configs/qemu_arm_defconfig b/configs/qemu_arm_defconfig
index d5890bf87fb3..a0d03dc19d0b 100644
--- a/configs/qemu_arm_defconfig
+++ b/configs/qemu_arm_defconfig
@@ -28,6 +28,7 @@ CONFIG_USE_PREBOOT=y
 # CONFIG_DISPLAY_CPUINFO is not set
 # CONFIG_DISPLAY_BOARDINFO is not set
 # CONFIG_BOARD_INIT is not set
+CONFIG_EARLY_PCI_INIT=y
 CONFIG_PCI_INIT_R=y
 CONFIG_CMD_BOOTEFI_SELFTEST=y
 CONFIG_CMD_NVEDIT_EFI=y