u-boot下的两个关键数据：bd_t和gd_t
发布时间：2021-11-21 17:39:06 所属栏目：教程 来源：互联网
导读：[u-boot: v2013.04] [Author: Bo Shen voice.shen@gmail.com] 众所周知，u-boot中有两个重要数据结构，一个是bd_t，另外一个是gd_t。下面分别介绍这两个数据结构。 1. bd_t 此数据结构保存board相关的信息。 定义：arch/arm/include/asm/u-boot.h 其具体结构
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[u-boot: v2013.04] [Author: Bo Shen voice.shen@gmail.com] 众所周知，u-boot中有两个重要数据结构，一个是bd_t，另外一个是gd_t。下面分别介绍这两个数据结构。 1. bd_t 此数据结构保存board相关的信息。 定义：<arch/arm/include/asm/u-boot.h> 其具体结构如下： typedef struct bd_info { unsigned int bi_baudrate; /* serial console baudrate */ ulong bi_arch_number; /* unique id for this board */ ulong bi_boot_params; /* where this board expects params */ unsigned long bi_arm_freq; /* arm frequency */ unsigned long bi_dsp_freq; /* dsp core frequency */ unsigned long bi_ddr_freq; /* ddr frequency */ struct /* RAM configuration */ { ulong start; ulong size; } bi_dram[CONFIG_NR_DRAM_BANKS]; } bd_t; 2. gd_t 定义：<include/asm-generic/global_data.h> 其具体结构如下： typedef struct global_data { bd_t *bd; unsigned long flags; unsigned int baudrate; unsigned long cpu_clk; /* CPU clock in Hz! */ unsigned long bus_clk; /* We cannot bracket this with CONFIG_PCI due to mpc5xxx */ unsigned long pci_clk; unsigned long mem_clk; #if defined(CONFIG_LCD) || defined(CONFIG_VIDEO) unsigned long fb_base; /* Base address of framebuffer mem */ #endif #if defined(CONFIG_POST) || defined(CONFIG_LOGBUFFER) unsigned long post_log_word; /* Record POST activities */ unsigned long post_log_res; /* success of POST test */ unsigned long post_init_f_time; /* When post_init_f started */ #endif #ifdef CONFIG_BOARD_TYPES unsigned long board_type; #endif unsigned long have_console; /* serial_init() was called */ #ifdef CONFIG_PRE_CONSOLE_BUFFER unsigned long precon_buf_idx; /* Pre-Console buffer index */ #endif #ifdef CONFIG_MODEM_SUPPORT unsigned long do_mdm_init; unsigned long be_quiet; #endif unsigned long env_addr; /* Address of Environment struct */ unsigned long env_valid; /* Checksum of Environment valid? */ /* TODO: is this the same as relocaddr, or something else? */ unsigned long dest_addr; /* Post-relocation address of U-Boot */ unsigned long dest_addr_sp; unsigned long ram_top; /* Top address of RAM used by U-Boot */ unsigned long relocaddr; /* Start address of U-Boot in RAM */ phys_size_t ram_size; /* RAM size */ unsigned long mon_len; /* monitor len */ unsigned long irq_sp; /* irq stack pointer */ unsigned long start_addr_sp; /* start_addr_stackpointer */ unsigned long reloc_off; struct global_data *new_gd; /* relocated global data */ const void *fdt_blob; /* Our device tree, NULL if none */ void *new_fdt; /* Relocated FDT */ unsigned long fdt_size; /* Space reserved for relocated FDT */ void **jt; /* jump table */ char env_buf[32]; /* buffer for getenv() before reloc. */ struct arch_global_data arch; /* architecture-specific data */ } gd_t;  （编辑：开发网_开封站长网） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |
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