BootLoader 分析

BootLoader 4970E0284970E0554970E004

bootLoader PCPC BIOS MBR OS Boot Loader BIOS MBR Boot Loader RAM OS Boot LoaderBoot Loader RAM

bootLoader ()123

bootLoader boot Loader CPU BootLoader CPU 1 2 C

Boot Loader 1 Boot Loader RAM 2 C

Boot Loader 2(memory map) kernel Flash RAM

GPIO GPIO LEDOK ErrorLEDUART Boot Loader Logo CPU clock

bootLoader RAM sp C sp RAM()sp led 2

sp2 C Boot Loader 2 ARM PC

2 C Boot Loader 2 ARM PC

Boot Loader 2 2 C C Boot Loader glibc main()2

I/O

4GB RAM CPU RAMCPU RAM CPU RAM RAM bootloader map __bsetup parts[]PXA27X SRAM SDRAM

bootloader 0x00000000_0x00040000256KSDRAM 0xA1E00000

kernel 0x00040000_0x001800001.25MSDRAM 0xA0008000

root 0x00180000_0x0200000030.5MSDRAM 0xA0000000

(MEM_START0x8000)1MB (Linux 1MB)MEM_START MEM_START0x8000 32KBLinuxMEM_START+0x00100000 Ramdisk 1MB

RAM LinuxLinux Linux2.4.x (tagged list)ATAG_CORE ATAG_NONE tag_header

Boot Loader Linux MEM_START0x8000

CPU R00R1IDR2RAM

CPU IRQs FIQsCPU SVC

Cache MMU MMU Cache Cache