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- x86 PCI DT details:
- ===================
- Some options are available to affect how PCI operates on x86.
- Optional properties:
- - u-boot,skip-auto-config-until-reloc : Don't set up PCI configuration until
- after U-Boot has relocated. Normally if PCI is used before relocation,
- this happens before relocation also. Some platforms set up static
- 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 {
- compatible = "pci-x86";
- #address-cells = <3>;
- #size-cells = <2>;
- u-boot,dm-pre-reloc;
- ranges = <0x02000000 0x0 0xc0000000 0xc0000000 0 0x10000000
- 0x42000000 0x0 0xb0000000 0xb0000000 0 0x10000000
- 0x01000000 0x0 0x1000 0x1000 0 0xefff>;
- u-boot,skip-auto-config-until-reloc;
- serial: serial@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;
- };
- };
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