Exynos4412 Uboot 移植(六)—— 相关知识补充
2017-06-27 20:46
267 查看
Uboot版本:u-boot-2013.01
一、gd结构体的定义与使用
gd_t 和 bd_t 是u-boot中两个重要的数据结构,在初始化操作很多都要靠这两个数据结构来保存或传递。
gd_t 定义在/u-boot-2013.01/arch/arm/include/asm/global_data.h
bd_t 定义在 ./include/asm-arm/u-boot.h
1、gd_t : global data数据结构定义
位于文件/u-boot-2013.01/arch/arm/include/asm/global_data.h 中。其成员主要是一些全局的系统初始化参数。
当使用gd_t 时需用宏定义进行声明DECLARE_GLOBAL_DATA_PTR
从这个宏的定义可以看出,gd是一个保存在ARM的r8寄存器中的gd_t结构体的指针。指定占用寄存器R8。
[cpp] view
plain copy
typedef struct global_data {
bd_t *bd;//struct board_info指针,保存开发板信息
unsigned long flags;//指示标志,如设备已经初始化标志等
unsigned int baudrate;//串口波特率
unsigned long have_console; //串口初始化标志
#ifdef CONFIG_PRE_CONSOLE_BUFFER
unsigned long precon_buf_idx; /* Pre-Console buffer index */
#endif
unsigned long env_addr; /* Address of Environment struct */
unsigned long env_valid; /* Checksum of Environment valid? */
unsigned long fb_base; /* base address of frame buffer */
#ifdef CONFIG_FSL_ESDHC
unsigned long sdhc_clk;
#endif
#ifdef CONFIG_AT91FAMILY
/* "static data" needed by at91's clock.c */
unsigned long cpu_clk_rate_hz;
unsigned long main_clk_rate_hz;
unsigned long mck_rate_hz;
unsigned long plla_rate_hz;
unsigned long pllb_rate_hz;
unsigned long at91_pllb_usb_init;
#endif
#ifdef CONFIG_ARM
/* "static data" needed by most of timer.c on ARM platforms */
unsigned long timer_rate_hz;
unsigned long tbl;
unsigned long tbu;
unsigned long long timer_reset_value;
unsigned long lastinc;
#endif
#ifdef CONFIG_IXP425
unsigned long timestamp;
#endif
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;
#if !(defined(CONFIG_SYS_ICACHE_OFF) && defined(CONFIG_SYS_DCACHE_OFF))
unsigned long tlb_addr;
unsigned long tlb_size;
#endif
const void *fdt_blob; /* Our device tree, NULL if none */
void **jt; /* jump table */
char env_buf[32]; /* buffer for getenv() before reloc. */
#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
} gd_t;
2.、bd_t :board info数据结构定义
位于文件u-boot-2013.01/arch/arm/include/asm/u-boot.h。保存板子参数。
[cpp] view
plain copy
typedef struct bd_info {
unsigned int bi_baudrate; /* 串口波特率 */
ulong bi_arch_number; /* 开发板机器ID */
ulong bi_boot_params; /* 启动参数 */
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;
一、gd结构体的定义与使用
gd_t 和 bd_t 是u-boot中两个重要的数据结构,在初始化操作很多都要靠这两个数据结构来保存或传递。
gd_t 定义在/u-boot-2013.01/arch/arm/include/asm/global_data.h
bd_t 定义在 ./include/asm-arm/u-boot.h
1、gd_t : global data数据结构定义
位于文件/u-boot-2013.01/arch/arm/include/asm/global_data.h 中。其成员主要是一些全局的系统初始化参数。
当使用gd_t 时需用宏定义进行声明DECLARE_GLOBAL_DATA_PTR
从这个宏的定义可以看出,gd是一个保存在ARM的r8寄存器中的gd_t结构体的指针。指定占用寄存器R8。
[cpp] view
plain copy
typedef struct global_data {
bd_t *bd;//struct board_info指针,保存开发板信息
unsigned long flags;//指示标志,如设备已经初始化标志等
unsigned int baudrate;//串口波特率
unsigned long have_console; //串口初始化标志
#ifdef CONFIG_PRE_CONSOLE_BUFFER
unsigned long precon_buf_idx; /* Pre-Console buffer index */
#endif
unsigned long env_addr; /* Address of Environment struct */
unsigned long env_valid; /* Checksum of Environment valid? */
unsigned long fb_base; /* base address of frame buffer */
#ifdef CONFIG_FSL_ESDHC
unsigned long sdhc_clk;
#endif
#ifdef CONFIG_AT91FAMILY
/* "static data" needed by at91's clock.c */
unsigned long cpu_clk_rate_hz;
unsigned long main_clk_rate_hz;
unsigned long mck_rate_hz;
unsigned long plla_rate_hz;
unsigned long pllb_rate_hz;
unsigned long at91_pllb_usb_init;
#endif
#ifdef CONFIG_ARM
/* "static data" needed by most of timer.c on ARM platforms */
unsigned long timer_rate_hz;
unsigned long tbl;
unsigned long tbu;
unsigned long long timer_reset_value;
unsigned long lastinc;
#endif
#ifdef CONFIG_IXP425
unsigned long timestamp;
#endif
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;
#if !(defined(CONFIG_SYS_ICACHE_OFF) && defined(CONFIG_SYS_DCACHE_OFF))
unsigned long tlb_addr;
unsigned long tlb_size;
#endif
const void *fdt_blob; /* Our device tree, NULL if none */
void **jt; /* jump table */
char env_buf[32]; /* buffer for getenv() before reloc. */
#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
} gd_t;
2.、bd_t :board info数据结构定义
位于文件u-boot-2013.01/arch/arm/include/asm/u-boot.h。保存板子参数。
[cpp] view
plain copy
typedef struct bd_info {
unsigned int bi_baudrate; /* 串口波特率 */
ulong bi_arch_number; /* 开发板机器ID */
ulong bi_boot_params; /* 启动参数 */
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;
相关文章推荐
- Exynos4412 Uboot 移植(六)—— 相关知识补充
- Exynos4412 Uboot 移植(六)—— 相关知识补充
- Exynos4412 Uboot 移植(六)—— 相关知识补充
- Exynos4412 内核移植(七)—— 内核相关知识补充
- Exynos4412 内核移植(七)—— 内核相关知识补充
- Exynos4412 内核移植(四)—— MMU 相关知识解析
- Exynos4412 内核移植(四)—— MMU 相关知识解析
- <2012 12 05> FL2440开发板的U-boot-2010.09版本移植(五)支持DM9000网卡和板级相关LED等配置
- 封装相关知识(不断补充中)
- 封装相关知识(不断补充中)
- u-boot 相关问题与知识
- 封装相关知识(不断补充中)
- 封装相关知识(不断补充中)
- 基于ArcGIS10.0和Oracle10g的空间数据管理平台(C#开发)ArcGIS相关知识补充学习
- 前段开发相关知识重点补充;
- fl2440的U-boot-2010.09移植(三)DM9000网卡及开发板相关配置
- 封装相关知识(不断补充中)
- 封装相关知识(不断补充中)
- 封装相关知识(不断补充中)
- 封装相关知识(不断补充中)