AN13709 - Measurements

[이전] [목차] [다음]

3 Measurements

측정 범위는 보드 POR(Power-On Reset)과 PSPLASH 프로세스 시작 사이로 간주된다.

 

다음 측정에 사용되는 설정은 Boot Time Measurements Methodology 문서에 설명되어 있다.

 

측정된 간격은 다음과 같다.

Table 1. Measured intervals

Time point	Interval between pulses	Location of the pulse	Boot stages
BootROM	nRST -> before ddr_init()	board/freescale/imx8mn_evk/spl.c/board_init_f()	SPL
DDR initialization	before ddr_init() -> after ddr_init()	board/freescale/imx8mn_evk/spl.c/board_init_f()
SPL initialization + Load U-Boot image	after ddr_init() -> before image_entry()	common/spl/spl.c/jump_to_image_no_args()
U-Boot initializations (init_sequence_f)	before image_entry() -> start init_sequence_r	common/board_r.c/board_init_r()	U-BOOT
U-Boot initializations (init_sequence_r)	start init_sequence_r ->  u-boot main_loop	common/main.c
Boot sequence	u-boot main_loop -> before load_image	include/configs/imx8mn_evk.h
Kernel Image Load	before loadimage -> after loadimage	include/configs/imx8mn_evk.h
Kernel Boot Until PSPLASH Image	after loadimage -> psplash	psplash.c	Kernel

 

 

[이전] [목차] [다음]