Re: [coreboot] Reducing the boot time

[Antony AbeePrakash X V]

Hi,

Thanks for your feedback.

We enabled ENABLE_FSP_FAST_BOOT and MRC cache Training data in FSP using binary configuration tool. Also we reduced the console log level to 0.

Now the boot time is reduced to 23 secs for initial boot and 11 secs for upcoming power cycles.

Is this a normal behavior ?

Also from the console logs we found the following:

Coreboot FSP Performance Data
ID: 950 - 951: 8118676370 - 2354813461 --> 4433ms   (TS_FSP_MEMORY_INIT_START - TS_FSP_MEMORY_INIT_END)
ID: 952 - 953: 10675414728 - 8905813067 --> 1361ms  (TS_FSP_TEMP_RAM_EXIT_START - TS_FSP_TEMP_RAM_EXIT_END)
ID: 954 - 955: 11761158519 - 10934089420 --> 636ms   (TS_FSP_SILICON_INIT_START - TS_FSP_SILICON_INIT_END)
ID: 956 - 957: 19265617974 - 19265559282 --> 0ms       (TS_FSP_BEFORE_ENUMERATE - TS_FSP_AFTER_ENUMERATE)

Can we reduce the above mentioned time taken by modifying the FSP source ? Please advice.

Thanks

From: Matt DeVillier [mailto:[e-mail]]
Sent: Saturday, August 11, 2018 1:15 PM
To: Antony AbeePrakash X V 
Cc: coreboot 
Subject: Re: [coreboot] Reducing the boot time

assuming you've built with CONFIG_COLLECT_TIMESTAMPS=y, you can build/run the cbmem utility and see how long each stage/section of coreboot is taking (up to the point of handing off control to the payload).  30s to boot sounds like either you're not caching the RAM training data (MRC cache) and therefore redoing RAM training each time, or outputting the boot console to a non-existent serial port (which can slow everything down).  Whatever it is, looking at the timestamps will go a long way towards identifying the issue

On Sat, Aug 11, 2018 at 2:13 AM Antony AbeePrakash X V <[e-mail]> wrote:
Hi,

We have developed a coreboot image for Apollo lake custom board. The time taken for boot up is around 30 seconds.
We would like to reduce the boot time as much as possible.

Following codes are removed:

1.  Non-intel Apollolake specific codes in below folders

*   Arch
     *   Soc
     *   Mainboard
     *   Vendorcode

1.  Splash screen loading
  2.  SPI support – other than our custom board SPI.

Also we have disabled the COMPRESS_RAMSTAGE. Still we are not able to reduce the boot time.

Please suggest the methods to reduce the boot time.
Thanks & Regards,
Antony

L&T Technology Services Ltd

www.LntTechservices.comhttp://www.lnttechservices.com/

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