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Subject: Re: [coreboot] Coreboot 4.5: No early serial output
From: Naveed Ghori <naveed.ghori () dti ! com ! au>
Date: 2017-03-30 7:12:05
Message-ID: 741EAB6DD877764C872CB96AA8F38D8CB217B009 () mx01 ! dti ! lan
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Fixed.
Best I can tell it was due to a clean build as all the other parameters are the same.
I had gone back to v4.4 to rebuild and check too, but the problem has persisted. \
Potentially to do with using .config from a different version of coreboot.
But it works so no more investigation ☺.
Naveed
From: Zoran Stojsavljevic [mailto:zoran.stojsavljevic@gmail.com]
Sent: Thursday, 30 March 2017 12:49 AM
To: Naveed Ghori
Cc: coreboot@coreboot.org
Subject: Re: [coreboot] Coreboot 4.5: No early serial output
Hello Naveed,
> In Coreboot 4.4 (Intel baytrail FSP) early serial output use to work (first line \
> being coreboot version followed by RTC Init) In Coreboot 4.5 it seems that serial \
> output only works once the FSP initializes the serial port (first line being \
> romstage_main_continue).
What entity initializes serial port in Coreboot 4.4 (BYT FSP or Coreboot itself)? In \
which stage?
Once you get answer to this question, you should know what to do for/in Coreboot 4.5 \
. ;-)
Zoran
On Wed, Mar 29, 2017 at 10:55 AM, Naveed Ghori \
<naveed.ghori@dti.com.au<mailto:naveed.ghori@dti.com.au>> wrote: Hi all,
In Coreboot 4.4 (Intel baytrail FSP) early serial output use to work (first line \
being coreboot version followed by RTC Init) In Coreboot 4.5 it seems that serial \
output only works once the FSP initializes the serial port (first line being \
romstage_main_continue).
Notes: Setup for spew output, using the debug serial port lines.
I am looking at what might have caused this but though I'd ask if this was a known \
issue, possibly already fixed with a patch or if it was an error on my part.
Note sure exactly where to search as I have already reviewed the changes in \
src/drivers/uart/uart8250io.c
Regards,
Naveed
Naveed Ghori | Lead Firmware & Driver Engineer
DTI Group Ltd | Transit Security & Surveillance
31 Affleck Road, Perth Airport, Western Australia 6105, Australia
P +61 8 9373 2905<tel:+61%208%209373%202905>,151 | F +61 8 9479 \
1190<tel:+61%208%209479%201190> | \
naveed.ghori@dti.com.au<mailto:naveed.ghori@dti.com.au>
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<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Fixed.
<o:p></o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Best \
I can tell it was due to a clean build as all the other parameters are the \
same.<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I \
had gone back to v4.4 to rebuild and check too, but the problem has persisted. \
Potentially to do with using .config from a different version of \
coreboot.<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">But \
it works so no more investigation </span><span \
style="font-size:11.0pt;font-family:Wingdings;color:#1F497D">J</span><span \
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">.<o:p></o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Naveed<o:p></o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span \
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span \
style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Zoran \
Stojsavljevic [mailto:zoran.stojsavljevic@gmail.com] <br>
<b>Sent:</b> Thursday, 30 March 2017 12:49 AM<br>
<b>To:</b> Naveed Ghori<br>
<b>Cc:</b> coreboot@coreboot.org<br>
<b>Subject:</b> Re: [coreboot] Coreboot 4.5: No early serial \
output<o:p></o:p></span></p> <p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">Hello Naveed,<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span \
style="font-size:9.5pt">> In Coreboot 4.4 (Intel baytrail FSP) early serial output \
use to work (first line being coreboot version followed by RTC \
Init)<o:p></o:p></span></p> <p class="MsoNormal" \
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span \
style="font-size:9.5pt">> In Coreboot 4.5 it seems that serial output only works \
once the FSP initializes the serial port (first line being \
romstage_main_continue).<o:p></o:p></span></p> <p class="MsoNormal" \
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span \
style="font-size:9.5pt"><o:p> </o:p></span></p> <p class="MsoNormal" \
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span \
style="font-size:9.5pt">What entity initializes serial port in Coreboot 4.4 (BYT FSP \
or Coreboot itself)? In which stage?<o:p></o:p></span></p> <p class="MsoNormal" \
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span \
style="font-size:9.5pt"><o:p> </o:p></span></p> <p class="MsoNormal" \
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span \
style="font-size:9.5pt">Once you get answer to this question, you should know what to \
do for/in Coreboot 4.5 . ;-)<o:p></o:p></span></p> <p class="MsoNormal" \
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span \
style="font-size:9.5pt"><o:p> </o:p></span></p> <p class="MsoNormal" \
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span \
style="font-size:9.5pt">Zoran<o:p></o:p></span></p> </div>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">On Wed, Mar 29, 2017 at 10:55 AM, Naveed Ghori <<a \
href="mailto:naveed.ghori@dti.com.au" target="_blank">naveed.ghori@dti.com.au</a>> \
wrote:<o:p></o:p></p> <div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hi \
all,<o:p></o:p></p> <p class="MsoNormal" \
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p> <p \
class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">In \
Coreboot 4.4 (Intel baytrail FSP) early serial output use to work (first line being \
coreboot version followed by RTC Init)<o:p></o:p></p> <p class="MsoNormal" \
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">In Coreboot 4.5 it seems \
that serial output only works once the FSP initializes the serial port (first line \
being romstage_main_continue).<o:p></o:p></p> <p class="MsoNormal" \
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p> <p \
class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Notes: \
Setup for spew output, using the debug serial port lines.<o:p></o:p></p> <p \
class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I am \
looking at what might have caused this but though I'd ask if this was a known issue, \
possibly already fixed with a patch or if it was an error on my part.<o:p></o:p></p> \
<p class="MsoNormal" \
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p> <p \
class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Note \
sure exactly where to search as I have already reviewed the changes in \
src/drivers/uart/uart8250io.c<o:p></o:p></p> <p class="MsoNormal" \
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p> <p \
class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Regards,<o:p></o:p></p>
<p class="MsoNormal" \
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Naveed<o:p></o:p></p> \
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Gothic","sans-serif";color:#595959"> | Lead Firmware & Driver \
Engineer<o:p></o:p></span></p> </td>
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