127 lines
4.2 KiB
Plaintext
127 lines
4.2 KiB
Plaintext
menu "Boot timing"
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config BOOTSTAGE
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bool "Boot timing and reporting"
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help
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Enable recording of boot time while booting. To use it, insert
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calls to bootstage_mark() with a suitable BOOTSTAGE_ID from
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bootstage.h. Only a single entry is recorded for each ID. You can
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give the entry a name with bootstage_mark_name(). You can also
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record elapsed time in a particular stage using bootstage_start()
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before starting and bootstage_accum() when finished. Bootstage will
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add up all the accumated time and report it.
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Normally, IDs are defined in bootstage.h but a small number of
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additional 'user' IDs can be used but passing BOOTSTAGE_ID_ALLOC
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as the ID.
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Calls to show_boot_progress() wil also result in log entries but
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these will not have names.
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config BOOTSTAGE_REPORT
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bool "Display a detailed boot timing report before booting the OS"
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depends on BOOTSTAGE
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help
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Enable output of a boot time report just before the OS is booted.
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This shows how long it took U-Boot to go through each stage of the
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boot process. The report looks something like this:
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Timer summary in microseconds:
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Mark Elapsed Stage
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0 0 reset
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3,575,678 3,575,678 board_init_f start
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3,575,695 17 arch_cpu_init A9
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3,575,777 82 arch_cpu_init done
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3,659,598 83,821 board_init_r start
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3,910,375 250,777 main_loop
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29,916,167 26,005,792 bootm_start
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30,361,327 445,160 start_kernel
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config BOOTSTAGE_USER_COUNT
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hex "Number of boot ID numbers available for user use"
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default 20
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help
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This is the number of available user bootstage records.
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Each time you call bootstage_mark(BOOTSTAGE_ID_ALLOC, ...)
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a new ID will be allocated from this stash. If you exceed
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the limit, recording will stop.
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config BOOTSTAGE_FDT
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bool "Store boot timing information in the OS device tree"
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depends on BOOTSTAGE
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help
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Stash the bootstage information in the FDT. A root 'bootstage'
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node is created with each bootstage id as a child. Each child
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has a 'name' property and either 'mark' containing the
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mark time in microsecond, or 'accum' containing the
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accumulated time for that bootstage id in microseconds.
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For example:
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bootstage {
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154 {
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name = "board_init_f";
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mark = <3575678>;
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};
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170 {
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name = "lcd";
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accum = <33482>;
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};
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};
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Code in the Linux kernel can find this in /proc/devicetree.
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config BOOTSTAGE_STASH
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bool "Stash the boot timing information in memory before booting OS"
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depends on BOOTSTAGE
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help
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Some OSes do not support device tree. Bootstage can instead write
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the boot timing information in a binary format at a given address.
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This happens through a call to bootstage_stash(), typically in
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the CPU's cleanup_before_linux() function. You can use the
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'bootstage stash' and 'bootstage unstash' commands to do this on
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the command line.
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config BOOTSTAGE_STASH_ADDR
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hex "Address to stash boot timing information"
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default 0
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help
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Provide an address which will not be overwritten by the OS when it
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starts, so that it can read this information when ready.
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config BOOTSTAGE_STASH_SIZE
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hex "Size of boot timing stash region"
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default 4096
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help
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This should be large enough to hold the bootstage stash. A value of
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4096 (4KiB) is normally plenty.
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endmenu
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config CONSOLE_RECORD
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bool "Console recording"
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help
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This provides a way to record console output (and provide console
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input) through cirular buffers. This is mostly useful for testing.
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Console output is recorded even when the console is silent.
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To enable console recording, call console_record_reset_enable()
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from your code.
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config CONSOLE_RECORD_OUT_SIZE
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hex "Output buffer size"
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depends on CONSOLE_RECORD
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default 0x400 if CONSOLE_RECORD
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help
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Set the size of the console output buffer. When this fills up, no
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more data will be recorded until some is removed. The buffer is
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allocated immediately after the malloc() region is ready.
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config CONSOLE_RECORD_IN_SIZE
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hex "Input buffer size"
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depends on CONSOLE_RECORD
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default 0x100 if CONSOLE_RECORD
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help
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Set the size of the console input buffer. When this contains data,
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tstc() and getc() will use this in preference to real device input.
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The buffer is allocated immediately after the malloc() region is
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ready.
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