[coreboot] Coreboot 4.5: No early serial output

[Zoran Stojsavljevic]

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 at 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
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