bootstage command

Synopsis

bootstage report
bootstage save
bootstage restore
bootstage stash [<start> [<size>]]
bootstage unstash [<start> [<size>]]

Description

The bootstage command provides access to U-Boot’s boot-timing records.

bootstage report: Print a report of all bootstage records, showing the timestamp and elapsed time for each stage.
bootstage save: Save the current record count to the bootstage_count environment variable. This can be used to snapshot the bootstage state before an operation that adds records.
bootstage restore: Restore the record count from bootstage_count, discarding any records added since the last save. This is used by the Python test framework to prevent records from accumulating across tests.
bootstage stash: Stash bootstage data into memory at the given address and size. Only available when CONFIG_BOOTSTAGE_STASH is enabled.
bootstage unstash: Read back previously stashed bootstage data from memory. Only available when CONFIG_BOOTSTAGE_STASH is enabled.

Configuration

The bootstage command is available when CONFIG_BOOTSTAGE is enabled.

CONFIG_BOOTSTAGE_REPORT: Enable output of a boot-time report before booting the OS.
CONFIG_BOOTSTAGE_RECORD_COUNT: Number of bootstage records to store (default 50).
CONFIG_BOOTSTAGE_SAVE: Enable the save and restore subcommands. Default y when CONFIG_UNIT_TEST is set.
CONFIG_BOOTSTAGE_STASH: Enable the stash and unstash subcommands for passing bootstage data to the OS via memory.

Example

=> bootstage report
Timer summary in microseconds (8 records):
       Mark    Elapsed  Stage
          0          0  reset
          0          0  board_init_f
     29,743     29,743  board_init_r
     52,918     23,175  eth_common_init
     53,007         89  eth_initialize

Accumulated time:
                 1,235  dm_f
                   670  of_live
                 5,621  dm_r

=> bootstage save
=> bootstage restore