[coreboot] Coreboot 4.5: No early serial output

[Naveed Ghori]

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 at gmail.com]
Sent: Thursday, 30 March 2017 12:49 AM
To: Naveed Ghori
Cc: coreboot at 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 at dti.com.au<mailto: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


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