u-boot memory layout

本文分享了一张关于U-Boot内存布局的分析图,并记录了相关内容以供后续使用。

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近期对于u-boot memory layout的一个分析图。

记录一下以被后用。

 

 

### RTD1296 U-Boot Configuration and Usage Tutorial For devices utilizing the Realtek RTD1296 SoC, configuring and using U-Boot as the bootloader involves several specific steps tailored towards this particular architecture. The following sections provide an overview of how one might go about setting up U-Boot on such hardware. #### Understanding RTD1296 Architecture Specifics The RTD1296 system-on-chip (SoC) features ARM Cortex-A53 cores which require a carefully crafted boot process that includes initializing memory controllers among other peripherals before handing control over to Linux or another operating system kernel[^3]. This initialization phase heavily relies upon correctly configured U-Boot settings. #### Preparing Environment for Building U-Boot To compile U-Boot specifically for the RTD1296 platform, ensure development environment supports cross-compilation tools suitable for ARM architectures. Obtain source code from official repositories maintained by U-Boot developers: ```bash git clone https://source.codeaurora.org/external/u-boot/u-boot.git cd u-boot/ ``` Select appropriate configuration options matching target board specifications through menuconfig interface provided within build scripts: ```bash make rtd1296_defconfig make menuconfig ``` This setup ensures all necessary drivers and functionalities required by RTD1296 are included during compilation[^4]. #### Flashing Compiled Image onto Device Storage Once successfully built, transfer generated binary files (`u-boot.bin`, `spl/u-boot-spl-dtb.bin`) via serial console connection or network-based methods like TFTP depending on available interfaces supported by your device model. For direct flashing into internal eMMC storage, commands similar to those below may apply but should always follow manufacturer guidelines closely due to potential risks involved when modifying firmware directly: ```bash sf probe 0:0 sf erase 0x0 0x80000 sf write 0x80000 spl/u-boot-spl-dtb.bin sf write 0x100000 u-boot.img ``` These operations involve probing SPI flash chip at specified address range, erasing existing content prior to writing new SPL (Secondary Program Loader) followed by main U-Boot image segments sequentially[^5]. #### Configuring Boot Arguments Within U-Boot Shell After ensuring proper installation, interactively set environmental variables inside U-Boot command line interpreter to define parameters passed down eventually to loaded kernels including root filesystem paths, IP configurations etc., examples include: ```bash setenv bootargs 'console=ttyS0,115200 earlyprintk root=/dev/mmcblk0p2 rw' saveenv bootm ${loadaddr} - ${fdt_addr} ``` Here `${loadaddr}` refers to where kernel images reside after being fetched while `${fdt_addr}` points toward flattened device tree blob location containing detailed descriptions regarding connected components layout pertinent especially for ARM platforms[^6]. --related questions-- 1. What are some common issues encountered when compiling U-Boot for different SoCs? 2. How does one troubleshoot problems related to improper loading of secondary program loaders in embedded systems? 3. In what ways do variations between various versions of U-Boot impact compatibility across diverse hardware models? 4. Are there alternative approaches besides using TFTP server for deploying U-Boot binaries remotely onto target boards?
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