common/Kconfig

   1 menu "Boot timing"
   2
   3 config BOOTSTAGE
   4         bool "Boot timing and reporting"
   5         help
   6           Enable recording of boot time while booting. To use it, insert
   7           calls to bootstage_mark() with a suitable BOOTSTAGE_ID from
   8           bootstage.h. Only a single entry is recorded for each ID. You can
   9           give the entry a name with bootstage_mark_name(). You can also
  10           record elapsed time in a particular stage using bootstage_start()
  11           before starting and bootstage_accum() when finished. Bootstage will
  12           add up all the accumated time and report it.
  13
  14           Normally, IDs are defined in bootstage.h but a small number of
  15           additional 'user' IDs can be used but passing BOOTSTAGE_ID_ALLOC
  16           as the ID.
  17
  18           Calls to show_boot_progress() wil also result in log entries but
  19           these will not have names.
  20
  21 config BOOTSTAGE_REPORT
  22         bool "Display a detailed boot timing report before booting the OS"
  23         depends on BOOTSTAGE
  24         help
  25           Enable output of a boot time report just before the OS is booted.
  26           This shows how long it took U-Boot to go through each stage of the
  27           boot process. The report looks something like this:
  28
  29                 Timer summary in microseconds:
  30                        Mark    Elapsed  Stage
  31                           0          0  reset
  32                   3,575,678  3,575,678  board_init_f start
  33                   3,575,695         17  arch_cpu_init A9
  34                   3,575,777         82  arch_cpu_init done
  35                   3,659,598     83,821  board_init_r start
  36                   3,910,375    250,777  main_loop
  37                  29,916,167 26,005,792  bootm_start
  38                  30,361,327    445,160  start_kernel
  39
  40 config BOOTSTAGE_USER_COUNT
  41         hex "Number of boot ID numbers available for user use"
  42         default 20
  43         help
  44           This is the number of available user bootstage records.
  45           Each time you call bootstage_mark(BOOTSTAGE_ID_ALLOC, ...)
  46           a new ID will be allocated from this stash. If you exceed
  47           the limit, recording will stop.
  48
  49 config BOOTSTAGE_FDT
  50         bool "Store boot timing information in the OS device tree"
  51         depends on BOOTSTAGE
  52         help
  53           Stash the bootstage information in the FDT. A root 'bootstage'
  54           node is created with each bootstage id as a child. Each child
  55           has a 'name' property and either 'mark' containing the
  56           mark time in microsecond, or 'accum' containing the
  57           accumulated time for that bootstage id in microseconds.
  58           For example:
  59
  60                 bootstage {
  61                         154 {
  62                                 name = "board_init_f";
  63                                 mark = <3575678>;
  64                         };
  65                         170 {
  66                                 name = "lcd";
  67                                 accum = <33482>;
  68                         };
  69                 };
  70
  71           Code in the Linux kernel can find this in /proc/devicetree.
  72
  73 config BOOTSTAGE_STASH
  74         bool "Stash the boot timing information in memory before booting OS"
  75         depends on BOOTSTAGE
  76         help
  77           Some OSes do not support device tree. Bootstage can instead write
  78           the boot timing information in a binary format at a given address.
  79           This happens through a call to bootstage_stash(), typically in
  80           the CPU's cleanup_before_linux() function. You can use the
  81           'bootstage stash' and 'bootstage unstash' commands to do this on
  82           the command line.
  83
  84 config BOOTSTAGE_STASH_ADDR
  85         hex "Address to stash boot timing information"
  86         default 0
  87         help
  88           Provide an address which will not be overwritten by the OS when it
  89           starts, so that it can read this information when ready.
  90
  91 config BOOTSTAGE_STASH_SIZE
  92         hex "Size of boot timing stash region"
  93         default 4096
  94         help
  95           This should be large enough to hold the bootstage stash. A value of
  96           4096 (4KiB) is normally plenty.
  97
  98 endmenu
  99
 100 config CONSOLE_RECORD
 101         bool "Console recording"
 102         help
 103           This provides a way to record console output (and provide console
 104           input) through cirular buffers. This is mostly useful for testing.
 105           Console output is recorded even when the console is silent.
 106           To enable console recording, call console_record_reset_enable()
 107           from your code.
 108
 109 config CONSOLE_RECORD_OUT_SIZE
 110         hex "Output buffer size"
 111         depends on CONSOLE_RECORD
 112         default 0x400 if CONSOLE_RECORD
 113         help
 114           Set the size of the console output buffer. When this fills up, no
 115           more data will be recorded until some is removed. The buffer is
 116           allocated immediately after the malloc() region is ready.
 117
 118 config CONSOLE_RECORD_IN_SIZE
 119         hex "Input buffer size"
 120         depends on CONSOLE_RECORD
 121         default 0x100 if CONSOLE_RECORD
 122         help
 123           Set the size of the console input buffer. When this contains data,
 124           tstc() and getc() will use this in preference to real device input.
 125           The buffer is allocated immediately after the malloc() region is
 126           ready.