Hi Bin
Thanks for your help.
Following is my dts file for your reference. I use qemu-x86_q35 in u-boot as dts template. Orginally I think the ops->read_config should maps to pci_x86_read_config(), but the dump result is it failed in the logic "if (!ops->read_config)" in pci_bus_read_config(). I am not familiar with DM and I guess maybe my DM tree is incorrect that creates wrong mapping for the pci driver. This wrong mapping will result in incorret result of SPI_BASE_ADDRESS. Thanks.
/* * Copyright (C) 2015, Bin Meng bmeng.cn@gmail.com * * SPDX-License-Identifier: GPL-2.0+ */
/dts-v1/;
#include <dt-bindings/interrupt-router/intel-irq.h>
/* ICH9 IRQ router has discrete PIRQ control registers */ #undef PIRQE #undef PIRQF #undef PIRQG #undef PIRQH #define PIRQE 8 #define PIRQF 9 #define PIRQG 10 #define PIRQH 11
/include/ "skeleton.dtsi" /include/ "serial.dtsi" /include/ "keyboard.dtsi" /include/ "rtc.dtsi" /include/ "tsc_timer.dtsi"
/ { model = "QEMU x86 (Q35)"; compatible = "qemu,x86";
aliases { spi0 = &spi; };
config { silent_console = <0>; u-boot,no-apm-finalize; };
chosen { stdout-path = "/serial"; };
cpus { #address-cells = <1>; #size-cells = <0>;
cpu@0 { device_type = "cpu"; compatible = "cpu-qemu"; reg = <0>; intel,apic-id = <0>; }; };
tsc-timer { clock-frequency = <1000000000>; };
pci { compatible = "pci-x86"; #address-cells = <3>; #size-cells = <2>; u-boot,dm-pre-reloc; ranges = <0x02000000 0x0 0xc0000000 0xc0000000 0 0x10000000 0x42000000 0x0 0xd0000000 0xd0000000 0 0x10000000 0x01000000 0x0 0x2000 0x2000 0 0xe000>;
pch@1f,0 { reg = <0x0000f800 0 0 0 0>; compatible = "intel,pch9";
irq-router { compatible = "intel,irq-router"; intel,pirq-config = "pci"; intel,pirq-link = <0x60 8>; intel,pirq-mask = <0x0e40>; intel,pirq-routing = < /* e1000 NIC */ PCI_BDF(0, 2, 0) INTA PIRQG /* ICH9 UHCI */ PCI_BDF(0, 29, 0) INTA PIRQA PCI_BDF(0, 29, 1) INTB PIRQB PCI_BDF(0, 29, 2) INTC PIRQC /* ICH9 EHCI */ PCI_BDF(0, 29, 7) INTD PIRQD /* ICH9 SATA */ PCI_BDF(0, 31, 2) INTA PIRQA >; };
spi: spi { #address-cells = <1>; #size-cells = <0>; compatible = "intel,ich9-spi"; spi-flash@0 { #size-cells = <1>; #address-cells = <1>; reg = <0>; compatible = "winbond,w25q64dw", "spi-flash"; memory-map = <0xff000000 0x01000000>; rw-mrc-cache { label = "rw-mrc-cache"; reg = <0x006e0000 0x00010000>; }; }; }; };
};
};
Regards, Hilbert This e-mail and its attachment may contain PEGATRON Corp information that is confidential or privileged, and are solely for the use of the individual to whom this e-mail is addressed. If you are not the intended recipient or have received it accidentally, please immediately notify the sender by reply e-mail and destroy all copies of this email and its attachment. Please be advised that any unauthorized use, disclosure, distribution or copying of this email or its attachment is strictly prohibited.