linux dts pcie ranges属性的含义

本文解析了PCIExpress(PCIe)中的地址转换机制,包括预取和非预取内存区域以及I/O区域的映射,分别对应于PCI地址空间、CPU地址和大小。详尽介绍了从PCI地址0x80000000到0xa0000000和0x00000000到0xb0000000的映射规则,来源自elinux.org。

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在这里插入图片描述

简述

如上图定义了pcie三组地址转换关系,每一组的几个数字分别定义了属性(32bit),pci地址空间(64bit),cpu地址(32bit/64bit),长度(64bit)

属性的含义

32bit属性
bit位的原文解释
bit位的原文解释的机翻

设备树之中三组地址映射的解释

  • 从 PCI 地址0x80000000开始的 32 位可预取内存区域,大小为 512 MB,将映射到主机 CPU 上的地址0x80000000。
  • 从 256 MB 大小的 PCI 地址0xa0000000开始的 32 位不可预取内存区域,将映射到主机 CPU 上的地址0xa0000000。
  • 从 PCI 地址0x00000000开始的 I/O 区域大小为 16 MB,将映射到主机 CPU 上的地址0xb0000000。

elinux.org

### Zynq-7000 PCIe Configuration and Documentation For the Zynq-7000 series FPGA, configuring Peripheral Component Interconnect Express (PCIe) involves several key components within both hardware design and software setup. The primary files involved include `pcw.dtsi`, which contains IO configurations specific to projects created through Vivado or PlanAhead tools; `zynq-7000.dtsi` provides common definitions applicable across all members of this family[^1]. When dealing with PCIe specifically: The Device Tree Source (`DTS`) file plays an essential role in defining how Linux interacts with underlying hardware like PCIe endpoints. For instance, when adding support for a new peripheral connected via PCI express interface, one would typically modify these DTS files accordingly. To properly configure PCIe on Zynq devices, users should refer to Xilinx's official documentation such as "Zynq-7000 AP SoC TRM" that covers detailed information about setting up root complex mode operation along with necessary register settings required by the core logic inside PS part of Zynq chipsets[^2]. Additionally, there are community-contributed resources available online where developers share their experiences working around certain aspects related to enabling DMA transfers over PCIe links using AXI bridges provided alongside PL section of Zynq boards[^3]. #### Example Code Snippet Demonstrating Basic Setup Steps Within .dts File ```bash / { compatible = "xlnx,zynq"; pcie@e0002000 { /* Address may vary depending upon your board */ status = "okay"; #address-cells = <1>; #size-cells = <0>; ranges; // Add more properties here based on requirements... }; }; ``` --related questions-- 1. How does modifying the device tree affect communication between CPU cores and peripherals? 2. What steps must be taken before integrating custom IP blocks into existing designs involving PCIe interfaces? 3. Can you explain the significance of address mapping while configuring PCIe controllers under Zynq platforms? 4. Are there any particular challenges faced during bring-up phases concerning power management features associated with high-speed interconnects like PCIe?
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