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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 |
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