PC机上引导程序一般由BIOS开始执行,然后读取硬盘中位于MBR(Main Boot Record,主引导记录)中的Bootloader(例如LILO或GRUB),并进一步引导操作系统的启动。 嵌入式系统中通常没有像BIOS那样的固件程序,因此整个系统的加载启动就完全由bootloader来完成,它主要的功能是加载与引导内核映像。 一个嵌入式的存储设备通过通常包括四...
main.o : main.c gcc -c main.c当敲了make命令之后, make会把main.o做为默认目标: 然后发现main.o在当前目录下不存在, 则会执行gcc -c main.c命令. 该命令就会生成main.o, 也就是会生成目标文件main.o 如果再次敲make命令, 则什么都不会发生...
#elseldr r1,=__bss_end/* this is auto-relocated! */mov r2,#0x00000000/* prepare zero to clear BSS */clbss_l:cmp r0,r1/* while not at end of BSS */#ifdefined(CONFIG_CPU_V7M)itt lo #endif strlo r2,[r0]/* clear 32-bit BSS word */addlo r0,r0,#4/* move to next */bl...
it's my pleasure to introduce Geoffrey Everest Hinton as we recognize this evening his contributions to the field of computer science, both in computational and engineering breakthroughs that have
utility number 效用数值utility of money 货币效用值utility profile 效用剖面法utility routine 实用程序utility service 辅助性服务行业utility theory 效用理论utility value 效用值utility waste 可利用的废物utility winch 杂用绞车utility 效用;公用事业通用的;实用的;公用事业的utilization efficiency of machinedays 设备...
unsigned long fb_base; /* base address of frame buffer */ #ifdef CONFIG_VFD unsigned char vfd_type; /* display type */ #endif void **jt; /* jump table */ } gd_t; 这个数据结构是系统初始化的最小全局变量值,主要在 boot 引导的早期使用,直到我们设置好内存控制器并能够访问 RAM。注意,保...
memmove (&images.legacy_hdr_os_copy, hdr, sizeof(image_header_t)); 把hdr中的值复制一份到 image.legacy_hdr_os_copy中,即把内存地址0x30008000处设置好的zImage头复制一份到uboot的data段, 因为static bootm_headers_t images; images为uboot内定义的一个bootm_header_t格式的全局变量; ...
Stage 3:mass number of active users. MAN users in this stage hit 1 million, with massive variations in maximum concurrency in different regions and at different times. If capacity planning for the entire network is based on a unified average concurrency rate, congestion is very likely in some...
movi read {sector#} {device_number} {bytes(hex)} {addr} - instead of this, you can use "mmc read" movi write {sector#} {device_number} {bytes(hex)} {addr} - instead of this, you can use "mmc write" 1. 2. 3. 4.
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