Nand flash 要改 layout include/configs/am335x_evm.h 修改 define 這樣可以影響arch/arm/include/asm/arch-am335x/omap_gpmc.h (之前是 arch-omap3/) DRAM 要改 timing arch/arm/include/asm/arch-am33xx/ddr_defs.h arch/arm/cpu/armv7/am33xx/board.c 中會 invoke config_ddr –> config_sdram

In this article we focus on some study notes in linux kernel startup and we mainly focus on start_kernel Specific Arch Initialize in @/init/main.c we could find asmlinkage void __init start_kernel(void) This is the main function to initialize linux kernel. start_kernel() –> setup_arch(&command_line) –> setup_process() will detect the CPU type and invoke high level cpu […]

We could know the MTD structure of AM335x via cat /proc/mtd and we will get dev: size      erasesize name mtd0:  00020000  00020000  “SPL”  mtd1:  00020000  00020000  “SPL.backup1” mtd2:  00020000  00020000  “SPL.backup2” mtd3:  00020000  00020000  “SPL.backup3” mtd4:  001e0000  00020000  “U-Boot” mtd5:  00020000  00020000  “U-Boot Env” mtd6:  00500000  00020000  “Kernel” mtd7:  0f880000  00020000  “File System” […]