@@ -10,6 +10,17 @@ Optional properties:
configuration in TPL/SPL to reduce code size and boot time, since these
phases only know about a small subset of PCI devices.
+For PCI devices the following optional property is available:
+
+- pci,no-autoconfig : Don't automatically configure this PCI device at all.
+ This is used when the device is statically configured and must maintain
+ this same config throughout the boot process. An example is a serial
+ UART being used to debug PCI configuration, since reconfiguring it stops
+ the UART from working until the driver is re-probed, and this can cause
+ output to be lost. This should not generally be used in production code,
+ although it is often harmless.
+
+
Example:
pci {
@@ -21,4 +32,16 @@ pci {
0x42000000 0x0 0xb0000000 0xb0000000 0 0x10000000
0x01000000 0x0 0x1000 0x1000 0 0xefff>;
u-boot,skip-auto-config-until-reloc;
+
+
+ serial: serial at 18,2 {
+ reg = <0x0200c210 0 0 0 0>;
+ u-boot,dm-pre-reloc;
+ compatible = "intel,apl-ns16550";
+ early-regs = <0xde000000 0x20>;
+ reg-shift = <2>;
+ clock-frequency = <1843200>;
+ current-speed = <115200>;
+ pci,no-autoconfig;
+ };
};
@@ -536,6 +536,8 @@ int pci_auto_config_devices(struct udevice *bus)
int ret;
debug("%s: device %s\n", __func__, dev->name);
+ if (dev_read_bool(dev, "pci,no-autoconfig"))
+ continue;
ret = dm_pciauto_config_device(dev);
if (ret < 0)
return ret;