Uboot Bootstage

了解Uboot Bootstage

1.Kconfig Introduction

CONFIG_BOOTSTAGE

common/Kconfig:
config BOOTSTAGEbool "Boot timing and reporting"helpEnable recording of boot time while booting. To use it, insertcalls to bootstage_mark() with a suitable BOOTSTAGE_ID frombootstage.h. Only a single entry is recorded for each ID. You cangive the entry a name with bootstage_mark_name(). You can alsorecord elapsed time in a particular stage using bootstage_start()before starting and bootstage_accum() when finished. Bootstage willadd up all the accumulated time and report it.Normally, IDs are defined in bootstage.h but a small number ofadditional 'user' IDs can be used by passing BOOTSTAGE_ID_ALLOCas the ID.Calls to show_boot_progress() will also result in log entries butthese will not have names.

CONFIG_BOOTSTAGE_REPORT

config BOOTSTAGE_REPORTbool "Display a detailed boot timing report before booting the OS"depends on BOOTSTAGEhelpEnable output of a boot time report just before the OS is booted.This shows how long it took U-Boot to go through each stage of theboot process. The report looks something like this:Timer summary in microseconds:Mark    Elapsed  Stage0          0  reset3,575,678  3,575,678  board_init_f start3,575,695         17  arch_cpu_init A93,575,777         82  arch_cpu_init done3,659,598     83,821  board_init_r start                                                           3,910,375    250,777  main_loop29,916,167 26,005,792  bootm_start30,361,327    445,160  start_kernel

CONFIG_BOOTSTAGE_STASH_ADDR

config BOOTSTAGE_STASH_ADDRhex "Address to stash boot timing information"default 0helpProvide an address which will not be overwritten by the OS when itstarts, so that it can read this information when ready.

CONFIG_BOOTSTAGE_STASH_SIZE

config BOOTSTAGE_STASH_SIZEhex "Size of boot timing stash region"default 0x1000help                                                                                                     This should be large enough to hold the bootstage stash. A value of4096 (4KiB) is normally plenty.

2.BOOTSTAGE_ID_*

  enum bootstage_id {BOOTSTAGE_ID_START = 0,BOOTSTAGE_ID_CHECK_MAGIC,   /* Checking image magic */BOOTSTAGE_ID_CHECK_HEADER,  /* Checking image header */BOOTSTAGE_ID_CHECK_CHECKSUM,    /* Checking image checksum */BOOTSTAGE_ID_CHECK_ARCH,    /* Checking architecture */BOOTSTAGE_ID_CHECK_IMAGETYPE = 5,/* Checking image type */BOOTSTAGE_ID_DECOMP_IMAGE,  /* Decompressing image */BOOTSTAGE_ID_KERNEL_LOADED, /* Kernel has been loaded */BOOTSTAGE_ID_DECOMP_UNIMPL = 7, /* Odd decompression algorithm */BOOTSTAGE_ID_CHECK_BOOT_OS, /* Calling OS-specific boot function */BOOTSTAGE_ID_BOOT_OS_RETURNED,  /* Tried to boot OS, but it returned */BOOTSTAGE_ID_CHECK_RAMDISK = 9, /* Checking ram disk */                                                BOOTSTAGE_ID_RD_MAGIC,      /* Checking ram disk magic */BOOTSTAGE_ID_RD_HDR_CHECKSUM,   /* Checking ram disk heder checksum */BOOTSTAGE_ID_RD_CHECKSUM,   /* Checking ram disk checksum */BOOTSTAGE_ID_COPY_RAMDISK = 12, /* Copying ram disk into place */BOOTSTAGE_ID_RAMDISK,       /* Checking for valid ramdisk */BOOTSTAGE_ID_NO_RAMDISK,    /* No ram disk found (not an error) */BOOTSTAGE_ID_RUN_OS = 15,   /* Exiting U-Boot, entering OS */BOOTSTAGE_ID_NEED_RESET = 30,BOOTSTAGE_ID_POST_FAIL,     /* Post failure */BOOTSTAGE_ID_POST_FAIL_R,   /* Post failure reported after reloc */...

3.代码分析

3.1. 常用函数

 common/bootstage.c：int bootstage_init(bool first);ulong bootstage_add_record(enum bootstage_id id, const char *name,int flags, ulong mark);ulong bootstage_mark(enum bootstage_id id);ulong bootstage_mark_name(enum bootstage_id id, const char *name);  ulong bootstage_mark_code(const char *file, const char *func,int linenum);uint32_t bootstage_start(enum bootstage_id id, const char *name); uint32_t bootstage_accum(enum bootstage_id id);int bootstage_stash(void *base, int size);int bootstage_unstash(const void *base, int size);

3.2.bootstage初始化

 498 int bootstage_init(bool first)499 {500     struct bootstage_data *data;501     int size = sizeof(struct bootstage_data);502 503     gd->bootstage = (struct bootstage_data *)malloc(size);504     if (!gd->bootstage)505         return -ENOMEM;506     data = gd->bootstage;507     memset(data, '\0', size);508     if (first) {509         data->next_id = BOOTSTAGE_ID_USER;510         bootstage_add_record(BOOTSTAGE_ID_AWAKE, "reset", 0, 0);511     }512                                                                                                        513     return 0;514 }

初始化全局变量gd->bootstage，然后调用bootstage_add_record添加record到结构体数组struct bootstage_record record[RECORD_COUNT]; 数组大小由RECORD_COUNT决定。

   19 enum {20     RECORD_COUNT = CONFIG_VAL(BOOTSTAGE_RECORD_COUNT),                                                 21 };

3.3.添加自定义

bootstage_mark(BOOTSTAGE_ID_RUN_OS);
bootstage_mark_name(BOOTSTAGE_ID_START_UBOOT_F, “board_init_f”);

3.4. config配置

CONFIG_ BOOTSTAGE=y
CONFIG_ SPL_BOOTSTAGE=y
CONFIG_ CMD_BOOTSTAGE=y
CONFIG_ BOOTSTAGE_STASH=y
CONFIG_ BOOTSTAGE_STASH_SIZE=0x4096
CONFIG_ BOOTSTAGE_REPORT=y
CONFIG_ BOOTSTAGE_RECORD_COUNT=40
CONFIG_ SPL_BOOTSTAGE_RECORD_COUNT=40

3.5.Debug

=> bootstage report
Timer summary in microseconds (6 records):Mark    Elapsed  Stage13,284,026          0  board_init_f16,594,567  3,310,541  board_init_r17,887,992  1,293,425  id=6417,898,594     10,602  main_loop17,961,225     62,631  id=173Accumulated time:102,461  dm_r849,307  dm_f

 => bootstage stash 0 0x4096
Stashed 7 records=> bootstage unstash 0 0x4096
Unstashed 7 records

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